| Volume 108, Issues 13 - 16 October 2023 | |
Advertisement | PRB seeks an Associate Editor to manage the peer review process of assigned manuscripts by determining whether to send a manuscript out for external review, choosing appropriate reviewers, and making decisions on rejection or acceptance. More information. | | | | | Advertisement  | Do you need language assistance for your next submission? Take advantage of new translation, figure assistance, and text editing services provided by APS and Editage. Experience exceptional support, expertise, and dedication for all your publishing needs. Get a quote. | | | | | | | Not an APS member? Join today to start connecting with a community of more than 50,000 physicists. | | | | Editors' Suggestion Xinwei Wang, Seán R. Kavanagh, David O. Scanlon, and Aron Walsh Phys. Rev. B 108, 134102 (2023) – Published 4 October 2023  | Negative-U defects in solids break the assumption that like charges repel. The standard negative-U model describes the favorable attraction of a second electron to a defect centre. Here, the authors demonstrate an extension of negative-U behavior up to a change of four electrons. This occurs for the emerging photovoltaic compound Sb2Se3. The phenomenon is explained as a special case of valence alternation arising from the large change in structure and bonding that accompanies electron capture. | | | | | | Editors' Suggestion Ferdinand Evers, Ishita Modak, and Soumya Bera Phys. Rev. B 108, 134204 (2023) – Published 26 October 2023  | For over two decades, researchers have investigated the effect of many-body interactions on Anderson localization. Early studies proposed many-body localization, i.e., strict particle confinement under strong disorder. Here, the authors challenge this notion by highlighting the prevalence of many-body delocalization in a fruit-fly model: the disordered Heisenberg chain. Its relaxation dynamics synchronize over various variables and parameters while adopting the entanglement entropy as an "internal clock". These results suggest entanglement evolution as a novel temporal measure for a nuanced understanding of relaxation dynamics. | | | | | | Editors' Suggestion Brian Barch, Namit Anand, Jeffrey Marshall, Eleanor Rieffel, and Paolo Zanardi Phys. Rev. B 108, 134305 (2023) – Published 12 October 2023  | In weakly monitored quantum systems, traditional diagnostics of operator spreading such as out-of-time-ordered-correlators and Lieb-Robinson bounds can break down, as entanglement can spread at seemingly unbounded velocity. This has the adverse effect of making integrable and chaotic quantum dynamics appear identical. However, as the authors show here, the humble quantity of global operator entanglement remains a reliable metric of chaoticity in these systems. They elucidate this by studying entanglement phase transitions in a local, non-Hermitian transverse-field Ising model under the lens of operator and quenched entanglement dynamics. | | | | | | Editors' Suggestion C. Dissanayake, A. C. Jacko, K. Kumarasinghe, R. Munir, H. Siddiquee, W. J. Newsome, F. J. Uribe-Romo, E. S. Choi, S. Yadav, X.-Z. Hu, Y. Takano, S. Pakhira, D. C. Johnston, Q.-P. Ding, Y. Furukawa, B. J. Powell, and Y. Nakajima Phys. Rev. B 108, 134418 (2023) – Published 13 October 2023  | Frustrated magnets can be platforms for quantum spin-liquid states. A putative spin-liquid candidate, the hyperhoneycomb Cu oxalate framework compound [(C2H5)3NH]2Cu2(C2O4)3 exhibits the absence of long-range order and presence of charge-neutral excitations in the Mott insulating state at low temperatures. Here, the authors demonstrate experimental evidence for gapless spinons and a field-induced soliton gap in this material with the aid of theoretical calculations, and attribute them to weakly coupled antiferromagnetic Heisenberg chains, rather than a previously proposed spin-liquid state. | | | | | | Editors' Suggestion GiBaik Sim, Frank Pollmann, and Johannes Knolle Phys. Rev. B 108, 134423 (2023) – Published 17 October 2023  | This work explores the effectiveness of two-dimensional coherent spectroscopy for understanding the microscopic properties of quantum magnets. Motivated by experiments on the Ising chain magnet CoNb2O6, it is shown that the 2D spectra are markedly different for the two proposed microscopic Hamiltonians - the transverse field Ising model and the twisted Kitaev spin chain - even though the linear response is similar. The findings showcase the power of 2D spectroscopy for quantifying microscopic descriptions and understanding the dynamics of fractionalized excitations of quantum magnets. | | | | | | Editors' Suggestion Aishwarya Chauhan, Atanu Maity, Chunxiao Liu, Jonas Sonnenschein, Francesco Ferrari, and Yasir Iqbal Phys. Rev. B 108, 134424 (2023) – Published 18 October 2023  | The diamond lattice has been a promising playground for both classical and quantum spin liquids. Here, the authors conduct a comprehensive symmetry classification of S=½ quantum spin liquids with SU(2), U(1), and ℤ2 gauge fields, and present dynamical spin structure factors within a self-consistent simulation. The authors highlight three discoveries: spinon Ansätze with robust gapless nodal loops, topological bands realizing topological insulators, and that Gutzwiller projection of the 0- and π-flux SU(2) spin liquids generates long-range Néel order. | | | | | | Editors' Suggestion R. Misawa, K. Arakawa, T. Yoshioka, H. Ueda, F. Iga, K. Tamasaku, Y. Tanaka, and T. Kimura Phys. Rev. B 108, 134433 (2023) – Published 24 October 2023  | The interference effect between the magnetic scattering and the charge scattering in resonant x-ray diffraction (RXD) leads to circular dichroism. The authors utilize this effect here to distinguish the antiferromagnetic (AFM) domain state in the noncollinear antiferromagnet TbB4, breaking both the space-inversion (P) and time-reversal (T) symmetries but preserving the combined PT symmetry. This result shows that circularly polarized RXD using the interference effect enables us to detect AFM order parameters and spatially resolve the domain state in PT-symmetric AFM materials. | | | | | | Editors' Suggestion Fabio Caceffo and Vincenzo Alba Phys. Rev. B 108, 134434 (2023) – Published 25 October 2023  | The tripartite information (TMI) has emerged as a tool to sieve quantum correlations in quantum many-body systems. A negative TMI is interpreted as evidence for quantum information delocalization in chaotic systems. Here, the authors show that a negative TMI can appear in out-of-equilibrium free-fermion models, and it is linked to the presence of entangled multiplets of excitations. Negative TMI signals a weakening of the relationship between entanglement and thermodynamics, which can be understood in a generalized quasiparticle picture framework. | | | | | | Editors' Suggestion José Ángel Castellanos-Reyes, Paul Zeiger, Anders Bergman, Demie Kepaptsoglou, Quentin M. Ramasse, Juan Carlos Idrobo, and Ján Rusz Phys. Rev. B 108, 134435 (2023) – Published 27 October 2023  | This study delves deeply into the complexities of magnon diffuse scattering (MDS) in bcc Fe, unraveling the interplay between atomic vibrations and magnon signals in scanning transmission electron microscopy (STEM). The work details the role of temperature to explore feasible paths for MDS detection that could bring new understanding of magnetic solid-state phenomena at the nanometer scale. | | | | | | Editors' Suggestion C. G. L. Bøttcher, F. Nichele, J. Shabani, C. J. Palmstrøm, and C. M. Marcus Phys. Rev. B 108, 134517 (2023) – Published 27 October 2023  | The sudden depinning of vortices with increasing current through a super-semihybrid Josephson junction array results in a burst of differential resistance at integer and half-integer peaks of critical current. A striking feature is the split feature at f=0, indicating the absence of vortices at precisely zero field. The flat-topped portion at f=1/2 and the slanted top part at f=1 also reveal features of how the dynamical transition occurs. | | | | | | Editors' Suggestion P. Bouvier, L. Bussmann, D. Machon, I. Breslavetz, G. Garbarino, P. Strobel, and V. Dmitriev Phys. Rev. B 108, 144106 (2023) – Published 16 October 2023  | The authors unveil here new findings in the realm of phase transitions in VO2 single crystals, all achieved under hydrostatic pressure conditions. They provide experimental results, exploiting the observation of soft phonons through Raman spectroscopy and high-quality structural refinements. These findings offer a fresh perspective on phase diagrams, including a precise description of the M1-M1′ isostructural transition occurring at a staggering 14 GPa. The study also reveals that isothermal compression at 298 K drives a thrilling journey close to the critical point. The authors present the first Raman signature of the elusive metallic X-phase, observed at pressures exceeding 32 GPa. | | | | | | Editors' Suggestion R. Kohno, K. An, E. Clot, V. V. Naletov, N. Thiery, L. Vila, R. Schlitz, N. Beaulieu, J. Ben Youssef, A. Anane, V. Cros, H. Merbouche, T. Hauet, V. E. Demidov, S. O. Demokritov, G. de Loubens, and O. Klein Phys. Rev. B 108, 144410 (2023) – Published 12 October 2023  | Combining the nonlinear properties of ferromagnets with the spin-transfer effect promises to realize a "perfect" diode with pure spin conductors. Practical implementations are nonlocal devices that emit and collect magnons between two parallel electrodes on a magnetic insulator. A diode-like current-voltage characteristic appears, which is attributed to nonlinear enhancement of the low-energy magnon population. However, its amplitude is rather small and can be explained by the strong enhancement of magnon-magnon scattering near the diode threshold. This suggests conductance by a magnon fluid instead of a frictionless condensate. | | | | | | Editors' Suggestion R. Kohno, K. An, E. Clot, V. V. Naletov, N. Thiery, L. Vila, R. Schlitz, N. Beaulieu, J. Ben Youssef, A. Anane, V. Cros, H. Merbouche, T. Hauet, V. E. Demidov, S. O. Demokritov, G. de Loubens, and O. Klein Phys. Rev. B 108, 144411 (2023) – Published 12 October 2023  | Practical implementations of diode-like devices with pure spin conductors use magnon transport between two metallic electrodes deposited on a magnetic insulator. However, a diode-like response is only visible for a sufficiently large separation between the two electrodes. The authors attribute this behavior to the contribution of thermal magnons, which respond linearly to excitation and dominate the response for small separations. Their contribution decays rapidly with distance, revealing at large separations the nonlinear behavior that is associated with long-range propagating low-energy magnons. | | | | | | Editors' Suggestion Charles R. W. Steward, Rafael M. Fernandes, and Jörg Schmalian Phys. Rev. B 108, 144418 (2023) – Published 17 October 2023  | Altermagnetic states are qualitatively different from ferromagnetic and antiferromagnetic ones, as they are invariant under a combination of rotation and time reversal. The unique properties afforded by such symmetries have attracted significant attention by the community. Here, the authors unearth an unusual dynamic coupling that exists between the altermagnetic and lattice degrees of freedom, which resembles the Hall viscosity. This effect results in a hybridization between altermagnetic and phonon modes, enabling one to directly probe altermagnetic excitations in the phonon spectrum. | | | | | | Editors' Suggestion Luise Siegl, Michaela Lammel, Akashdeep Kamra, Hans Huebl, Wolfgang Belzig, and Sebastian T. B. Goennenwein Phys. Rev. B 108, 144420 (2023) – Published 18 October 2023  | The spin of so-called squeezed magnons has been shown to deviate from the common value ħ, with corresponding changes in the spin-current shot noise. The authors calculate here the magnitude of the concomitant voltage noise in the charge channel for a typical electrically detected spin pumping signal and find that it is significantly smaller than the inevitable Johnson-Nyquist noise. Their analysis thus provides important guidance for the challenges in experimentally detecting squeezed magnons through electrical noise measurements. | | | | | | Editors' Suggestion Ismael Ribeiro de Assis, Ingrid Mertig, and Börge Göbel Phys. Rev. B 108, 144438 (2023) – Published 30 October 2023  | Skyrmions in weak parameter gradients behave similarly to current-driven skyrmions, moving uniformly along a fixed skyrmion Hall angle relative to the current direction. This study reveals a distinct type of motion that becomes relevant for large parameter gradients: skyrmions undergo significant profile changes, resulting in a nonuniform motion. They accelerate and follow curved trajectories. Leveraging this insight, the authors introduce novel strategies for suppressing the skyrmion Hall effect, both parallel and perpendicular to the gradient direction. | | | | | | Editors' Suggestion Madeleine Geers, David M. Jarvis, Cheng Liu, Siddharth S. Saxena, Jem Pitcairn, Emily Myatt, Sebastian A. Hallweger, Silva M. Kronawitter, Gregor Kieslich, Sanliang Ling, Andrew B. Cairns, Dominik Daisenberger, Oscar Fabelo, Laura Cañadillas-Delgado, and Matthew J. Cliffe Phys. Rev. B 108, 144439 (2023) – Published 31 October 2023  | The ease of applying external stimuli, such as pressure, is an attractive feature for devices based on van der Waals materials. The authors report here the effect of pressure up to 8 kbar on Ni(NCS)2, a two-dimensional van der Waals magnet, using bulk magnetic susceptibility and neutron and x-ray diffraction. Ni(NCS)2 is found to be more compressible than metal halide analogues, with anisotropic compressibility both within the layers and between them. In addition to the large mechanical response, the magnetic ordering temperature is significantly enhanced: ΔTN /TN = 19%. | | | | | | Editors' Suggestion Eli Mueller, Yusuke Iguchi, Christopher Watson, Clifford W. Hicks, Yoshiteru Maeno, and Kathryn A. Moler Phys. Rev. B 108, 144501 (2023) – Published 4 October 2023  | Strontium ruthenate continues to draw considerable scientific interest as an unconventional superconductor. One open question is whether the superconducting order parameter has a single component or two degenerate components. Here, the authors use scanning SQUID microscopy to test for a second superconducting transition in the superfluid density under application of symmetry breaking strain, a key prediction for a system with a two-component order parameter. The reported non-observation of a second superconducting transition constrains future models of unconventional superconductivity in this fascinating material. | | | | | | Editors' Suggestion Victor L. Quito and R. Flint Phys. Rev. B 108, 155120 (2023) – Published 13 October 2023  | Floquet engineering has been used to engineer novel interactions in uncorrelated and magnetic insulating materials. Here, the authors apply this technique to simple heavy-fermion models, showing that driving these systems with periodic light introduces emergent Kondo screening channels with distinct symmetries, where the allowed channels are controlled by the light polarization. These systems can be driven through multichannel degeneracy points, dynamically realizing multichannel Kondo impurities and lattices that can be used to explore quantum critical phenomena and potentially enhance superconductivity. | | | | | | Editors' Suggestion Tommaso Roscilde, Tommaso Comparin, and Fabio Mezzacapo Phys. Rev. B 108, 155130 (2023) – Published 18 October 2023  | Elementary excitations of ordered quantum magnets are harmonic spin waves. Yet, when ordering breaks a continuous symmetry, excitations at zero momentum cannot really be treated as harmonic, because they correspond to the Goldstone mode that restores the symmetry in finite-size systems. Here, the authors show that zero-momentum excitations can be treated in a fully nonlinear way in terms of a macroscopic spin variable (the rotor): its spectrum reconstructs the so-called Anderson tower of states, a hallmark of continuous-symmetry breaking systems. The rotor variable can be considered as nearly separate from finite-momentum spin waves, leading to a quantitative reconstruction of the low-energy excitation spectrum of finite-size systems. | | | | | | Editors' Suggestion Piet W. Brouwer and Vatsal Dwivedi Phys. Rev. B 108, 155137 (2023) – Published 23 October 2023  | Fragile and delicate topological phases of noninteracting fermions can be trivialized under addition of trivial bands, in contrast to strong topological phases. Here, the authors describe a classification procedure based on homotopy theory for topological insulators with a fixed number of bands. They thereby classify band structures symmetric under discrete rotations and time-reversal at the highest possible level of granularity and identify instances of "representation-protected stable topology", which is robust to addition of trivial bands with a fixed orbital type. | | | | | | Editors' Suggestion Peter Stano, Takashi Nakajima, Akito Noiri, Seigo Tarucha, and Daniel Loss Phys. Rev. B 108, 155306 (2023) – Published 17 October 2023  | When a quantum-dot electron spin is electrically driven to perform coherent Rabi oscillations, it can polarize nuclear spins through a resonance analogous to the Hartmann-Hahn effect known from NMR. Here, the authors theoretically analyze such a polarization rate in a generic setup including GaAs, Si, and Ge, and both electron and hole spin qubits. They present measurements in n-GaAs and estimate that the effect is also observable in Si. It might offer control over the Overhauser nuclear field in gated quantum dots. | | | | | | Editors' Suggestion Cheng Guo, Jiazheng Li, Meng Xiao, and Shanhui Fan Phys. Rev. B 108, 155418 (2023) – Published 17 October 2023  | The scattering matrix is a crucial characterization of a physical system. The authors present here a systematic topological theory of scattering matrices, focusing on their singular values and vectors. They identify topological characteristics such as winding number, Berry phase, and skew polarization. The theory uncovers the topological nature of coherent perfect absorption and introduces coherent perfect extinction, where a coherent wave is completely extinguished through interference. These findings advance the understanding of scattering and have implications for novel wave devices. | | | | | | Editors' Suggestion Brian Cunningham, Myrta Grüning, Dimitar Pashov, and Mark van Schilfgaarde Phys. Rev. B 108, 165104 (2023) – Published 3 October 2023  | The QSGŴ approximation is presented here. It is an extension to the QSGW formulation [PRB 76, 165106 (2007)] with ladder diagrams in the screening W via the Bethe-Salpeter Equation. Implemented in Questaal (https://info.aps.org/e/640833/2023-11-01/2qfgpl/1058080559/h/527dCxKdFh1OcyCMkyubC_EgxjY2Nk4aoaiCIfij1PQ), additional short-ranged correlations in QSGŴ ameliorate much of the discrepancies with experiment for the one-body self-energy and two-body dielectric response in both simple semiconductors and correlated systems such as NiO and CoO, with a stronger effect observed for flat bands. | | | | | | Editors' Suggestion H. Fujiwara, Y. Nakatani, H. Aratani, Y. Kanai-Nakata, K. Yamagami, S. Hamamoto, T. Kiss, A. Yamasaki, A. Higashiya, S. Imada, A. Tanaka, K. Tamasaku, M. Yabashi, T. Ishikawa, A. Yasui, H. Yamagami, J. Miyawaki, A. Miyake, T. Ebihara, Y. Saitoh, and A. Sekiyama Phys. Rev. B 108, 165121 (2023) – Published 13 October 2023  | The Ce 4f-orbital symmetry in the ground states of the heavy-fermion superconductor CeNi2Ge2 is precisely determined here by utilizing linear dichroism in soft x-ray absorption and hard x-ray core-level photoemission spectroscopy. This yields the anisotropic 4f charge distribution, promoting the predominant hybridization with conducting electrons originating from the Ge site, which is verified by soft x-ray ARPES. These results suggest a possibility to drive the new exotic phases around the quantum critical points by controlling the Ge site. | | | | | | Editors' Suggestion Marcin Szyniszewski, Oliver Lunt, and Arijeet Pal Phys. Rev. B 108, 165126 (2023) – Published 17 October 2023  | The authors investigate here the dynamics of free fermions in a random potential system under continuous monitoring. Repeated measurements are known to induce an entanglement phase transition from a logarithmically entangled critical state to area law, while disorder leads to Anderson localization. They show that their interplay results in a stable critical phase at finite disorder strength and dissipation, which drive a transition consistent with Berezinskii-Kosterlitz-Thouless universality. This work is important for testing such phase transitions in quantum dot arrays and nanowires. | | | | | | Editors' Suggestion Yang Yang, Georgia Prokopiou, Tian Qiu, Aaron M. Schankler, Andrew M. Rappe, Leeor Kronik, and Robert A. DiStasio, Jr. Phys. Rev. B 108, 165142 (2023) – Published 23 October 2023  | This work presents a general scheme for constructing pseudopotentials for advanced density functional theory (DFT) calculations employing range-separated hybrid (RSH) functionals. The authors demonstrate pseudopotential construction for several atoms and RSH functionals, and find that pseudopotential consistency errors tend to be systematic when computing solid-state properties and can exceed 0.1 eV for band gaps. This work removes the need to incur such unnecessary errors when performing state-of-the-art electronic structure calculations at the computationally demanding RSH-DFT level. | | | | | | Editors' Suggestion Norio Okabayashi, Thomas Frederiksen, Alexander Liebig, and Franz J. Giessibl Phys. Rev. B 108, 165401 (2023) – Published 2 October 2023  | The manipulation process of a single CO molecule on a copper single crystal by a metallic tip is studied here using noncontact atomic force microscopy, with dissipation energy detection, vibrational spectroscopy, and density functional theory calculations. The manipulation of the CO molecule between the two adjacent top sites is found to occur via an intermediate state of CO on the bridging site. Furthermore, this finding allows for the interpretation of static and dynamic friction at the atomic scale. | | | | | | Editors' Suggestion Bob Minyu Wang, Yuqing Zhu, Henry Clark Travaglini, Renzhi Sun, Sergey Y. Savrasov, William Hahn, Klaus van Benthem, and Dong Yu Phys. Rev. B 108, 165405 (2023) – Published 5 October 2023  | Dirac semimetals (DSMs) have demonstrated many exotic properties, such as high carrier mobility, 3D quantum spin Hall effect, and topologically protected spin transport. However, their spin degeneracy has inhibited widespread applications in spintronics and quantum devices. Using a helicity-dependent photocurrent (HDPC), the authors demonstrate here spin generation in strain-free DSM Cd3As2 nanobelt field effect transistors at room temperature. The observed HDPC is attributed to spin-polarized Fermi arcs at the surface. This work provides key insights on light-controlled spin manipulation in Dirac materials. | | | | | | Editors' Suggestion Tenta Tani, Takuto Kawakami, and Mikito Koshino Phys. Rev. B 108, 165422 (2023) – Published 25 October 2023  | In moiré materials, the interference patterns give rise to flat bands and introduce novel physical properties. While previous work has mainly focused on two-dimensional systems, the authors theoretically investigate here emergent phenomena in twisted three-dimensional graphite composed of a misoriented pair of graphite pieces. Despite the twisted interface comprising only a small fraction of the entire structure, it is revealed that the moiré pattern produces interface localized bands, leading to a pronounced Fano resonance in electric conduction. | | | | | | Featured in Physics Editors' Suggestion Nicolas Zorn Morales, Daniel Steffen Rühl, Sergey Sadofev, Giovanni Ligorio, Emil List-Kratochvil, Günter Kewes, and Sylke Blumstengel Phys. Rev. B 108, 165426 (2023) – Published 27 October 2023  | This paper shows that the strong coupling regime between excitons in a WS2 monolayer and surface plasmon polaritons of a thin Ag film can be reached in a planar geometry of utmost simplicity. Total internal reflection ellipsometry provides a salient feature of strong coupling. The finding opens up the opportunity to engineer the light-matter interaction strength and even to tune the exciton-plasmon system between the weak and strong coupling regime via application of external stimuli. | | | | | | Editors' Suggestion Letter Guido Giachetti, Andrea Solfanelli, Lorenzo Correale, and Nicolò Defenu Phys. Rev. B 108, L140102 (2023) – Published 9 October 2023  | In Floquet time crystals, characterized by the spontaneous breaking of time-translational invariance, observables exhibit oscillations with a period multiple p>2 of the driving. Here, a new, experimentally accessible, order parameter is introduced, able to detect time-crystalline phases regardless of the value of p. This unveils a rich landscape with self-similar fractal boundaries in the phase diagram of the long-range kicked Ising model. These features are explained within the theoretical framework, along with the emergence of the Zp symmetry in Bloch eigenstates. | | | | | | Editors' Suggestion Letter Jun Gao, Ivan M. Khaymovich, Adrian Iovan, Xiao-Wei Wang, Govind Krishna, Ze-Sheng Xu, Emrah Tortumlu, Alexander V. Balatsky, Val Zwiller, and Ali W. Elshaari Phys. Rev. B 108, L140202 (2023) – Published 10 October 2023  | The transport of quantum particles and their possible localization are fundamental concepts in physics. Such particles are known to get stuck in strong electric fields due to the Wannier-Stark effect. But what will happen with this particle localization if the electric potential is present only on every second site? To answer this question, the authors mimic here the behavior of quantum particles with light in optical waveguides (shown in the image) and demonstrate that in finite systems there are both extended states, carrying the transport, and localized ones that are stuck. This first step opens the possibility to use this system as an encoder of quantum information in a compact way. | | | | | | Editors' Suggestion Letter N. Li, R. R. Neumann, S. K. Guang, Q. Huang, J. Liu, K. Xia, X. Y. Yue, Y. Sun, Y. Y. Wang, Q. J. Li, Y. Jiang, J. Fang, Z. Jiang, X. Zhao, A. Mook, J. Henk, I. Mertig, H. D. Zhou, and X. F. Sun Phys. Rev. B 108, L140402 (2023) – Published 4 October 2023  | The thermal Hall effect, where a transverse heat current is generated in response to a longitudinal temperature gradient, probes charge-neutral excitations in insulating quantum matter. By studying thermal transport in the Heisenberg-Kitaev antiferromagnet and spin liquid candidate Na2Co2TeO6, the authors find here that magnon polarons, i.e., hybridized phonons and magnons produced by spin-lattice coupling, govern the sign and magnitude of the observed signal. This is in contrast to a pure magnon transport theory, which fails to capture important features of the experiment. | | | | | | Editors' Suggestion Letter Qing-Geng Yang, Da Wang, and Qiang-Hua Wang Phys. Rev. B 108, L140505 (2023) – Published 17 October 2023  | For the new high-temperature superconductor La3Ni2O7 under high pressure, the authors analyze its pairing mechanism and pairing symmetry in a bilayer two-orbital Hubbard model. By combining functional renormalization group in weak-to-moderate interaction regime and Gutzwiller approximation for its low-energy effective model projected to atomic one- and two-electron states in the strong-coupling regime, they find robust extended s-wave or s±-wave pairing as triggered by spin fluctuations. | | | | | | | |
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