| Volume 108, Issues 17 - 20 November 2023 | |
Advertisement  | Comparative Study of Magnetocaloric Properties for Gd3+ Compounds with Different Frustrated Lattice Geometries
EliseAnne C. Koskelo, Paromita Mukherjee, Cheng Liu, Alice C. Sackville Hamilton, Harapan S. Ong, Claudio Castelnovo, M.E. Zhitomirsky, and Siân E. Dutton
PRX Energy 2, 033005 (2023) – Published 31 July 2023 | |
|  | Exciton-Condensate-Like Amplification of Energy Transport in Light Harvesting
Anna O. Schouten, LeeAnn M. Sager-Smith, and David A. Mazziotti
PRX Energy 2, 023002 (2023) – Published 28 April 2023 | | | | Sign up to receive PRX Energy monthly alerts | | | | Advertisement | The APS Committee on the Status of Women in Physics (CSWP) is now accepting proposals from undergraduate and graduate students who are interested in creating new WiP groups or enhancing existing ones. The deadline for proposals is January 26, 2024. Learn more. | | | | | | Not an APS member? Join today to start connecting with a community of more than 50,000 physicists. | | | | Editors' Suggestion Saranyo Moitra and Rajdeep Sensarma Phys. Rev. B 108, 174309 (2023) – Published 22 November 2023  | There are very few analytical methods to calculate entanglement entropy (EE) of large quantum many-body states. Here, the authors show how to construct EE of generic interacting fermions in arbitrary spatial dimensions in terms of measurable correlation functions. They provide approximate answers for EE when only few-particle correlations are known. The field theory they construct is applicable to systems both in and out of thermal equilibrium. | | | | | | Editors' Suggestion R. A. Ewings, M. Reehuis, F. Orlandi, P. Manuel, D. D. Khalyavin, A. S. Gibbs, A. D. Fortes, A. Hoser, A. J. Princep, and M. Jansen Phys. Rev. B 108, 174412 (2023) – Published 8 November 2023  | Cesium superoxide is magnetic, due to the half-occupied π orbitals on its O2− molecules. Neutron diffraction experiments done here find that the crystal structure undergoes a sequence of transitions from tetragonal to incommensurate to orthorhombic, with the latter two exhibiting staggered displacements of the cesium ions. The symmetry of this structure permits antisymmetric exchange, which is consistent with a canted antiferromagnetic structure also observed, and a nice example of a structure-property relationship. | | | | | | Editors' Suggestion Xianghan Xu, Lijun Wu, Yimei Zhu, and R. J. Cava Phys. Rev. B 108, 174432 (2023) – Published 20 November 2023  | As a Kramers ion, Co2+ can function as an effective spin-half ion, exhibiting large quantum fluctuations that give rise to rich and intriguing magnetic behaviors. Here, the authors present the synthesis of sizable single crystals of K2Co2TeO6. The structural characterization reveals a layered structure with an undistorted Co2+ honeycomb lattice stacking together. Magnetization and thermodynamics data unveil intricate magnetic phases and competing interactions. These results establish a promising platform for exploring Kitaev interactions and discovering exotic quantum phases. | | | | | | Editors' Suggestion Yuying Zhu, Heng Wang, Zechao Wang, Shuxu Hu, Genda Gu, Jing Zhu, Ding Zhang, and Qi-Kun Xue Phys. Rev. B 108, 174508 (2023) – Published 16 November 2023  | There is an on-going debate on the pairing symmetry – whether it is s-, d-, or d+id-wave – in twisted cuprates. Here, the authors obtain strong Josephson tunneling in 45∘-twisted cuprates with ultrahigh interfacial quality and precisely calibrated twist angles. The results firmly establish the existence of isotropic pairing in twisted cuprates, posing strong constraints on the theory considering a pure d wave or d+id wave. They also extend the study to the overdoped regime and observe the Josephson diode effect, promising next-generation high-temperature superconducting devices. | | | | | | Editors' Suggestion Hanbit Oh and Ya-Hui Zhang Phys. Rev. B 108, 174511 (2023) – Published 21 November 2023  | 80 K superconductivity was recently observed in a La3Ni2O7 under pressure. A pressing challenge is to unravel the intriguing pairing mechanism within these materials. Here, the authors point out a novel role of Hund's rule to transmit the superexchange coupling of the dz2 orbital to the dx2−y2 orbital, which is a key factor for understanding the remarkably high Tc. The transmitted Hund coupling makes the dx2−y2 orbital feel a large interlayer spin coupling but no interlayer hopping, a situation not explored before. Within one-orbital mean-field theory, the authors find robust s-wave pairing even at 50% hole doping. Moreover, they propose a new analytical framework, the so-called type-II t-J model, which they argue is the minimal model to incorporate all essential ingredients, including large Hund's coupling and two orbital effects. This work offers a new model, develops a pioneering method, and identifies intriguing pairing mechanisms in the emerging nickelate field. | | | | | | Editors' Suggestion Alessio Paviglianiti and Alessandro Silva Phys. Rev. B 108, 184302 (2023) – Published 6 November 2023  | Quantum systems subject to external monitoring manifest a rich phenomenology in their entanglement properties. Here, the authors use quantum Fisher information to uncover a multipartite entanglement phase transition in the monitored quantum Ising chain. By changing the measurement rate, they observe a shift from bounded to long-range multipartiteness of quantum correlations. They show that the quantum Fisher information displays distinct behavior from the entanglement entropy, and the two outline different phase boundaries. | | | | | | Editors' Suggestion Leonie Woodland, David Macdougal, Ivelisse M. Cabrera, Jordan D. Thompson, D. Prabhakaran, Robert I. Bewley, and Radu Coldea Phys. Rev. B 108, 184416 (2023) – Published 16 November 2023  | The excitations on an Ising chain are domain walls (spinons), which can be confined into a Zeeman ladder of bound states by an applied magnetic field. Here, the authors report inelastic neutron scattering measurements of a quasi-one-dimensional Ising-like ferromagnet to probe the evolution of the spectrum with field, from weak confinement, where there are many closely spaced bound states, to strong confinement, where only two bound states remain. They also propose a model Hamiltonian that quantitatively reproduces all observed spectra. | | | | | | Editors' Suggestion C. Cardoso, A. T. Costa, A. H. MacDonald, and J. Fernández-Rossier Phys. Rev. B 108, 184423 (2023) – Published 22 November 2023  | The conventional spin proximity effect is normally pictured in terms of a small spin splitting of the bands of a nonmagnetic material, due to exchange coupling to a ferromagnet. In this work, the authors show a different type of proximity mechanism, where only one spin channel in the nonmagnetic material becomes strongly hybridized with the ferromagnet, whereas the other remains unaffected. In the case of graphene coupled to CrI3, a ferromagnetic insulator, the authors show that the hybridization proximity is both strong and electrically tunable. | | | | | | Editors' Suggestion Andy Tanjaroon Ly, Benjamin Cohen-Stead, Sohan Malkaruge Costa, and Steven Johnston Phys. Rev. B 108, 184501 (2023) – Published 1 November 2023  | Su-Schrieffer-Heeger (SSH) electron-phonon (e−ph) interactions have been theorized to play critical roles in several novel states of matter, ranging from nontrivial topological states to high-temperature bipolaronic superconductivity. This work compares the superconducting and competing charge and bond correlations of the two-dimensional Holstein and optical (SSH) models. The authors find that near half-filling, light SSH (bi)polarons support superconductivity to larger values of e−ph coupling compared to the Holstein polaron. These results are essential for identifying and engineering bipolaronic superconductivity in quantum materials. | | | | | | Editors' Suggestion Maxim Dzero, Maxim Khodas, and Alex Levchenko Phys. Rev. B 108, 184513 (2023) – Published 22 November 2023  | Exploring quantum superconductor-metal transitions in correlated electron systems reveals intriguing phenomena under diverse nonthermal influences like pressure, chemical substitution, or magnetic field. This study delves into the impact of thermal and quantum fluctuations on transport properties as the system nears the superconducting state from the metallic phase. The focus is on multiband superconductors, unraveling the nuanced role of superconducting fluctuations. Interestingly, depending on the trajectory towards the quantum critical point, these fluctuations may induce localizing corrections to the normal-state conductivity. | | | | | | Editors' Suggestion Zhehao Zhang, David Aasen, and Sagar Vijay Phys. Rev. B 108, 205116 (2023) – Published 13 November 2023  | Using experimentally accessible two-body measurements, this work provides unique insights into constructing dynamical quantum error correcting codes with a subextensive number of qubits, and a nonzero error threshold. | | | | | | Editors' Suggestion Izak Snyman Phys. Rev. B 108, 205120 (2023) – Published 13 November 2023  | There are two distinct single-particle-like structures associated with dynamic fermionic quantum impurity systems. There are the quasiparticles that provide a description of low-energy excitations in terms of independent effective degrees of freedom. Then there is also the natural orbital basis, associated with the bare electronic degrees of freedom, which provides an economical description of ground-state correlations. This study employs natural orbitals to describe explicitly how bare electrons are dressed to form local Fermi liquid quasiparticles. | | | | | | Featured in Physics Editors' Suggestion Mário G. Silveirinha Phys. Rev. B 108, 205142 (2023) – Published 20 November 2023  | Nontrivial topological phases in electronic materials are often associated with the quantization of the Hall conductivity. Here, the author introduces a photonic analogue of this phenomenon. It is shown that the physical acceleration of a material can induce a photon flow in a direction perpendicular to the acceleration, analogous to the electronic Hall effect. For nonreciprocal materials, the response function linking the induced energy flow with the acceleration is quantized and is determined by the photonic gap Chern number. | | | | | | Editors' Suggestion Patrick J. Ledwith, Ashvin Vishwanath, and Daniel E. Parker Phys. Rev. B 108, 205144 (2023) – Published 21 November 2023  | Fractional Chern insulators exhibit the fractional quantum Hall effect (FQHE) in crystalline systems, without the need for strong magnetic fields, resulting in charge fractionalization, long-range entanglement, and anyonic statistics, potentially at elevated energy scales. The lowest Landau level (LLL) hosts the FQHE, but high Landau levels and many Chern bands do not. Vortexable bands capture the essential physics of the LLL that leads to the FQHE without requiring its more fine-tuned properties, such as uniformity of Berry curvature and of charge density. | | | | | | Editors' Suggestion Rui Sakano, Tokuro Hata, Kaiji Motoyama, Yoshimichi Teratani, Kazuhiko Tsutsumi, Akira Oguri, Tomonori Arakawa, Meydi Ferrier, Richard Deblock, Mikio Eto, and Kensuke Kobayashi Phys. Rev. B 108, 205147 (2023) – Published 21 November 2023  | The authors develop here an efficient and reliable method to estimate the Kondo temperature by exploiting the universal scaling property inherent in the Kondo effect, observed in the magnetic field dependent conductance in quantum dots. By applying this method to experiments conducted on a carbon nanotube quantum dot, they obtain successfully a quantitatively reliable estimate of the Kondo temperature. The method holds great promise for advancing the exploration of local Fermi liquid properties within various modern systems. | | | | | | Editors' Suggestion Fumiya Sekiguchi, Minoru Sakamoto, Kotaro Nakagawa, Hirokazu Tahara, Shunsuke A. Sato, Hideki Hirori, and Yoshihiko Kanemitsu Phys. Rev. B 108, 205201 (2023) – Published 13 November 2023  | High harmonic generation (HHG) in solids shows interesting behavior owing to their crystal structures. Here, the authors investigate a prominent example: HHG in GaAs can be enhanced by elliptically polarized light excitation. Remarkably, the enhancement is accompanied by emergent nonlinear optical activity, and it become salient only at particular "intermediate" excitation strengths. These results indicate that the key for HHG enhancement lies in the interference among nonlinear emission processes, revealing that not only material properties but optimal-strength excitations are important for controlling HHG properties via fine-tuning of the nonlinear dynamics. | | | | | | Editors' Suggestion Christopher Fuchs, Saquib Shamim, Pragya Shekhar, Lena Fürst, Johannes Kleinlein, Jukka I. Väyrynen, Hartmut Buhmann, and Laurens W. Molenkamp Phys. Rev. B 108, 205302 (2023) – Published 8 November 2023  | Since the first observation of the quantum spin Hall effect, it is known that the helical edge channel conductance exhibits fluctuations around the quantized value, in contrast to the (integer) quantum Hall effect. Here, the authors show, in a mechanistic study, that these fluctuations originate from spin-flip scattering mediated by charge puddles via a Kondo-type interaction, an effect which is expected to occur in any narrow-gap quantum spin Hall insulator. | | | | | | Editors' Suggestion Dong-min Kim, Jeongmin Nam, and Bong Jae Lee Phys. Rev. B 108, 205418 (2023) – Published 17 November 2023  | Recently, the thermal energy carried by surface waves along the boundaries of a thin film has drawn much attention. This work reports the measured plasmon thermal conductivity of novel metal films on a glass substrate with a Ti adhesive layer. When considering the size effect of the metal permittivity, a decrease of approximately 30% in plasmon thermal conductivity is observed. The authors demonstrate that the plasmon thermal conductivity of Au and Ag films can reach about 20% of their electron contribution. | | | | | | Editors' Suggestion Letter M. C. Cambria, G. Thiering, A. Norambuena, H. T. Dinani, A. Gardill, I. Kemeny, V. Lordi, Á. Gali, J. R. Maze, and S. Kolkowitz Phys. Rev. B 108, L180102 (2023) – Published 8 November 2023  | The zero-field splitting (ZFS) of the nitrogen vacancy (NV) center in diamond's ground-state electronic spin is temperature dependent, enabling nanoscale thermometry with NV centers. Here, the authors propose a simple, analytical expression that captures the measured ZFS over a wide range of temperatures. The authors explain the physical motivations for this expression and suggest that similar expressions may apply to other properties of the NV center, as well as to other solid-state spin systems. | | | | | | Editors' Suggestion Letter Rishabh Duhan, Subhamita Sengupta, Ruchi Tomar, Somak Basistha, Vivas Bagwe, Chandan Dasgupta, and Pratap Raychaudhuri Phys. Rev. B 108, L180503 (2023) – Published 8 November 2023  | Real space imaging using a scanning tunnelling microscope reveals the formation of an inhomogeneous vortex liquid state in few nanometer thick superconducting films that does not freeze into a crystal or a glass down to 0.41 K. Vortices in this two-dimensional liquid form a network of percolating paths, due to the combined effect of pinning and intervortex interaction. While some vortices remain static, others move on this network, with their relative fractions changing with magnetic field, temperature, and applied current. | | | | | | Editors' Suggestion Letter Yang Zhang, Ling-Fang Lin, Adriana Moreo, and Elbio Dagotto Phys. Rev. B 108, L180510 (2023) – Published 28 November 2023  | The recently discovered high-temperature superconductor La3Ni2O7 with Tc ~ 80 K under pressure has revolutionized the field of correlated electrons. The authors find here that an orbital-selective spin-singlet "dimer" linking the two planes of this bilayer via the d3z2−r2 orbital provides the primary building block to study its electronic properties. Furthermore, an in-plane robust interorbital hopping between eg states, competes with the more natural intraorbital hopping, leading to a dominant spin stripe (π, 0) order, as well as a rich phase diagram. | | | | | | Editors' Suggestion Letter L. Shen, V. Esposito, N. G. Burdet, M. Zhu, A. N. Petsch, T. P. Croft, S. P. Collins, Z. Ren, F. Westermeier, M. Sprung, S. M. Hayden, J. J. Turner, and E. Blackburn Phys. Rev. B 108, L201111 (2023) – Published 13 November 2023  | The charge density wave (CDW) state is crucial for understanding high-temperature superconductivity in cuprates. How the CDW forms, however, is still debated. It does not have a well-defined thermodynamic phase transition, but is typically characterized by a temperature TCDW, below which spatial coherence begins to grow. Using x-ray photon correlation spectroscopy to study an archetypal cuprate, the authors show here that the atomic relaxation dynamics – an inherent, yet hardly explored property in the doped cuprates – is coupled to this change at TCDW. | | | | | | | |
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