| Volume 109, Issues 1 - 4 January 2024 | | Advertisement | Registration is still open for March Meeting 2024 - one of the largest and most exciting conferences in physics! Witness groundbreaking physics research, network with potential employers, and prepare for career success at March Meeting 2024. Register today. | | | | |
Advertisement  | Highlighting one of the most exciting fields in polymer science, this Collection of papers, guest-edited by Kevin Dorfman from the University of Minnesota and Chris Bates from the University of California - Santa Barbara, presents research covering block copolymers, which offer an excellent model system for comprehending symmetry breaking in soft matter, as well as a unique platform for designing nanostructured materials. Read the first published papers in the Collection. | | | | | | Advertisement | Provide strategic and operational leadership for the journal, overseeing both the day-to-day running of activity and setting direction for long term goals. The Chief Editor also collaborates with the Publications Leadership and Management to develop the scope, direction and strategy of the journal, ensuring it remains relevant and sustainable. Learn more. | | | | | | Not an APS member? Join today to start connecting with a community of more than 50,000 physicists. | | | | Editors' Suggestion Victor S. L'vov, Anna Pomyalov, Sergey V. Nazarenko, Dmytro A. Bozhko, Alexander J. E. Kreil, Burkard Hillebrands, and Alexander A. Serga Phys. Rev. B 109, 014301 (2024) – Published 3 January 2024  | Quasiparticles, created in dissipative nonlinear wave systems by external excitation, can form a Bose-Einstein condensate. The authors describe here the physical phenomena and conditions leading to condensation in various regimes of external excitation from weak and stationary to ultrastrong pumping. The authors have developed a stationary nonlinear theory of kinetic instability for the latter, supported by the experimental data for magnons, parametrically pumped in room-temperature films of yttrium iron garnet. | | | | | | Editors' Suggestion Xavier Gonze, Samare Rostami, and Christian Tantardini Phys. Rev. B 109, 014317 (2024) – Published 30 January 2024  | Density Functional Perturbation Theory (DFPT) is a proven method for analyzing molecular and solid responses to perturbations. For metals, challenges arise due to Fermi-Dirac statistics and electronic bands crossing the Fermi energy. This work focuses on variational DFPT for metals, examining the convexity of the entropy function of occupation numbers. It emphasizes benefits from resmearing Fermi-Dirac broadening at finite temperature, details variational expressions for free energy derivatives, and addresses inaccuracies in unperturbed wavefunctions. The formalism is implemented in the ABINIT software. | | | | | | Editors' Suggestion Pablo Sala, Yizhi You, Johannes Hauschild, and Olexei Motrunich Phys. Rev. B 109, 014406 (2024) – Published 9 January 2024  | This work investigates the zero-temperature physics of generalized Bose-Hubbard models, which conserve finite Fourier momenta of the particle number. Analytical and numerical calculations predict a novel quasi-long-range order phase, in addition to more conventional Mott insulators. The former is characterized by a two-species Luttinger liquid in the infrared, with microscopic expectation values dressed by oscillatory contributions. The authors also conjecture that this phase is destroyed by the unbinding of topological defects along the temporal direction even when they are confined along the transverse direction. | | | | | | Editors' Suggestion C. A. Gallegos and A. L. Chernyshev Phys. Rev. B 109, 014424 (2024) – Published 25 January 2024  | The strongly anisotropic quasi-one-dimensional ferromagnet CoNb2O6 in a transverse field has provided a spectacular realization of the magnon decay effect in its paramagnetic phase. A self-consistent theory is proposed to regularize unphysical divergences while preserving the integrity of the singular threshold phenomena of magnon decay, demonstrating quantitative agreement with the neutron scattering results throughout the field regime inaccessible by standard spin-wave theory. Phenomenological constraints on the model, connections of CoNb2O6 to the other anisotropic-exchange materials, and the effects of longitudinal fields are explored. | | | | | | Editors' Suggestion A. O. Scheie, Y. Kamiya, Hao Zhang, Sangyun Lee, A. J. Woods, M. O. Ajeesh, M. G. Gonzalez, B. Bernu, J. W. Villanova, J. Xing, Q. Huang, Qingming Zhang, Jie Ma, Eun Sang Choi, D. M. Pajerowski, Haidong Zhou, A. S. Sefat, S. Okamoto, T. Berlijn, L. Messio, R. Movshovich, C. D. Batista, and D. A. Tennant Phys. Rev. B 109, 014425 (2024) – Published 25 January 2024  | Quantum spin liquids were proposed over 50 years ago, but identifying experimental signatures is extremely difficult. Here, the authors study the Yb triangular materials KYbSe2 and NaYbSe2, and show that KYbSe2 is well described by the Heisenberg J2-J1 model. Comparing this material to NaYbSe2 and CsYbSe2, a trend emerges where the magnetic exchange interactions are correlated with chemical substitution. This allows these systems to be controllably tuned toward (and possibly into) a theoretically predicted quantum spin liquid phase. | | | | | | Editors' Suggestion Pyeongjae Park, G. Sala, Th. Proffen, Matthew B. Stone, Andrew D. Christianson, and Andrew F. May Phys. Rev. B 109, 014426 (2024) – Published 25 January 2024  | This work establishes Yb-containing oxyhalides as a new family of materials for studying quantum magnetism on a frustrated square lattice. The titular compounds appear to possess long-range magnetic order below ≈0.21 K (YbBi2lO4), but analysis of their thermodynamic properties via a J1-J2 square lattice model suggests large magnetic frustration. This places the materials near the transition to a quantum spin liquid. Thus, the impact of quantum fluctuations is expected to be strong, motivating detailed studies of these and related phases. | | | | | | Editors' Suggestion Pushpendra Gupta, In Jun Park, Anupama Swain, Abhisek Mishra, Vivek P. Amin, and Subhankar Bedanta Phys. Rev. B 109, 014437 (2024) – Published 29 January 2024  | The authors report here the self-induced inverse spin Hall effect in epitaxial La0.67Sr0.33MnO3 (LSMO) films and perform first-principles calculations of the spin Hall conductivities of bulk LSMO. The LSMO films were prepared using pulsed laser deposition. The spin pumping voltage Vsp dominates over spin rectification effects, indicating the presence of appreciable spin-to-charge conversion in LSMO films. The spin Hall conductivity is calculated from first principles using density functional theory and the Kubo formalism, and the results qualitatively match with the experimental findings. | | | | | | Editors' Suggestion C. V. Storm, G. A. Woolman, C. M. Lonsdale, J. D. McHardy, M. J. Duff, G. J. Ackland, and M. I. McMahon Phys. Rev. B 109, 024101 (2024) – Published 3 January 2024  | This static high-pressure x-ray diffraction study of iridium investigates previous reports of a core-level crossing at 80 GPa, whereby the authors find no evidence for such a transition. Further computational investigations reveal that a core-level crossing does occur in iridium, but only at 400 GPa. In addition, the efficacy of bismuth as a pressure-transmitting medium is demonstrated, maintaining a uniaxial stress component in the sample below 2% up to 159 GPa. | | | | | | Featured in Physics Stephen G. Lipson and Emil Polturak Phys. Rev. B 109, 024109 (2024) – Published 25 January 2024  | Researchers have experimentally captured the melting of defects in a crystal, a process previously only understood through simulations. | | | | | | Editors' Suggestion Rafael M. Fernandes, Vanuildo S. de Carvalho, Turan Birol, and Rodrigo G. Pereira Phys. Rev. B 109, 024404 (2024) – Published 3 January 2024  | Altermagnets are an unconventional type of magnetic state with various appealing properties, both from the fundamental and applied physics perspectives. By investigating the impact of spin-orbit coupling on these states, this work reveals that all altermagnets are intrinsically noncollinear and that their Zeeman splittings possess symmetry-protected nodal lines. These features endow altermagnets with a remarkable resilience against external magnetic fields. | | | | | | Editors' Suggestion Sarang Gopalakrishnan, Alan Morningstar, Romain Vasseur, and Vedika Khemani Phys. Rev. B 109, 024417 (2024) – Published 12 January 2024  | The authors provide an analytic theory of the transport of magnetization in a set of interacting anisotropic spin chains. Even though these are many-body systems with diffusive transport on average, the full distribution that gives rise to that average is far from Gaussian – with fluctuations that, unlike conventional diffusion, are comparable to the mean. This is an example of how systems with the same hydrodynamics can belong to distinct dynamical universality classes. | | | | | | Editors' Suggestion Kai Huang, Edward Schwartz, Ding-Fu Shao, Alexey A. Kovalev, and Evgeny Y. Tsymbal Phys. Rev. B 109, 024426 (2024) – Published 19 January 2024  | Antiskyrmions, like skyrmions, are topologically protected magnetic quasiparticles, but exhibit greater stability and no transverse motion compared to skyrmions. This study employs ab initio calculations to investigate the polar layer stacking of two monolayers of a two-dimensional magnetic material CrI3, which can lead to the emergence of antiskyrmions. Atomistic spin dynamics simulations demonstrate the realization of antiskyrmions in Mn-doped CrI3 and shows that their spin texture can be switched by ferroelectric polarization of the polar bilayer. | | | | | | Editors' Suggestion M. Müller, J. Weber, F. Engelhardt, V. A. S. V. Bittencourt, T. Luschmann, M. Cherkasskii, M. Opel, S. T. B. Goennenwein, S. Viola Kusminskiy, S. Geprägs, R. Gross, M. Althammer, and H. Huebl Phys. Rev. B 109, 024430 (2024) – Published 23 January 2024  | The magnetoelastic coupling of magnetic and elastic excitations enables the generation of elastic waves carrying angular momentum. In a quantum picture, this corresponds to a resonant conversion of magnons to chiral phonons and vice versa. This study showcases this conversion process using a simple and versatile experimental platform consisting of a metallic magnetic thin film on a crystalline substrate. These findings allow us to study the impact of crystal symmetry on angular momentum transport by phonons and investigate phononic birefringence. | | | | | | Editors' Suggestion J.-F. Wong, K.-H. M. Chen, J.-M. Chia, Z.-P. Huang, S.-X. Wang, P.-T. Chen, L. B. Young, Y.-H. G. Lin, S.-F. Lee, C.-Y. Mou, M. Hong, and J. Kwo Phys. Rev. B 109, 024432 (2024) – Published 26 January 2024  | The topological Hall effect (THE) is a Hall response that arises from the deflection of motion of charge carriers flowing through nontrivial spin textures. Here, the authors observe a significant THE and investigate its interplay with the spin-polarized topological surface states in a proximity-magnetized topological insulator/ferrimagnet heterostructure. Specifically, they demonstrate a sign change in THE via a top electrical gate as the Fermi level is tuned from the electron-doped to the hole-doped region of the gapped Dirac cone. | | | | | | Editors' Suggestion Jonas Habel, Alexander Mook, Josef Willsher, and Johannes Knolle Phys. Rev. B 109, 024441 (2024) – Published 30 January 2024  | Topological magnon edge modes have been proposed for the realization of robust, low-loss spintronic devices. However, ubiquitous many-body interactions that do not preserve particle number significantly compromise their topological protection. The authors show here that these interactions can lead to significant edge mode damping, hybridization with bulk modes, and coupling between edge modes on opposite sides. These findings pose challenges for the experimental realization of topological magnon edge modes, but can be overcome by the application of large magnetic fields. | | | | | | Editors' Suggestion Dan Mao and Debanjan Chowdhury Phys. Rev. B 109, 024507 (2024) – Published 10 January 2024  | This work develops a systematic theoretical framework to determine the low-energy effective "diamagnetic" response associated with superconductivity and excitonic superfluidity in strongly interacting electronic models hosting isolated nearly flat bands. The results can be used to derive upper bounds on the transition temperatures for superconductivity and excitonic superfluidity without making any mean-field type approximations. The same theoretical framework can also be extended with very few modifications, to address questions related to ferromagnetism in flat bands and magnetic circular dichroism. | | | | | | Editors' Suggestion T. Fujii, O. Janson, H. Yasuoka, H. Rosner, Yu. Prots, U. Burkhardt, M. Schmidt, and M. Baenitz Phys. Rev. B 109, 035116 (2024) – Published 9 January 2024  | The electric field gradient (EFG) and magnetic excitation of TaSb2 were studied using nuclear quadrupole resonance (NQR) in a single crystal. The EFG parameters determined by measuring all expected NQR lines were corroborated by density functional theory (DFT) calculations. Despite the good agreement between the measured and calculated Sommerfeld coefficients, the spin-lattice relaxation rate was not captured by the DFT band calculations. To overcome this discrepancy, the authors propose a site-dependent in-gap state with an average energy gap of ~7 meV for the Sb sites and ~22 meV for the Ta site, which are much smaller than the semimetallic gap. | | | | | | Editors' Suggestion Surajit Sarkar, Alexander Lee, Girsh Blumberg, and Saurabh Maiti Phys. Rev. B 109, 035160 (2024) – Published 25 January 2024  | The inelastic photon scattering process by bulk plasmon collective modes in conventional metals is restricted by conservation laws. Here, the authors demonstrate that for materials with broken SU(2) spin symmetry that is present in inversion broken systems, the restriction on the light scattering process can be removed by spin-correlation mediated coupling of light to plasmons. The theory is supported by resonant Raman scattering experiment on BiTeI, a material with a giant Rashba effect, in which the authors explicitly demonstrate this light scattering process by plasmons. | | | | | | Editors' Suggestion Subiao Bian, Razvigor Ossikovski, Adolf Canillas, Gerald Jellison, and Oriol Arteaga Phys. Rev. B 109, 035201 (2024) – Published 3 January 2024  | Here, the complete determination of the spectroscopic permittivity tensor of crystalline silicon in consideration of spatial dispersion (SD) is presented. Using spectroscopic ellipsometry, two complex parameters, ε and p1 (wave-vector-dependent for SD), were measured, revealing significant findings. Remarkably, pronounced UV region anisotropy was observed in (110) silicon wafers, surpassing the NIR region by up to five orders of magnitude. In contrast, minimal anisotropy was detected in (100) plane measurements, supporting the proposed tensor model. Comparative analysis of (100) and (110) wafers, incorporating SD, showcased consistent ε values, contributing valuable insights into silicon's behavior. | | | | | | Featured in Physics Editors' Suggestion Anirban Sharma, Ajit C. Balram, and J. K. Jain Phys. Rev. B 109, 035306 (2024) – Published 22 January 2024  | The physical origin of the fractional quantum Hall effect at the half-filled lowest Landau level in wide quantum wells has remained a puzzle since its discovery three decades ago. This work presents quantitative calculations supporting the formation of a p-wave topological "superconductor" of composite fermions (CFs) here. CFs are predicted to form f-wave pairs at the quarter-filled Landau level in wide quantum wells. CF pairing is thus seen as the principal mechanism underlying the even-denominator fractional quantum Hall effect. | | | | | | Editors' Suggestion Pawel Potasz, Nicolás Morales-Durán, Nai Chao Hu, and Allan H. MacDonald Phys. Rev. B 109, 045144 (2024) – Published 23 January 2024  | Moiré superlattices give a unique opportunity to investigate controllable quantum systems. Previous studies of transition metal dichalcogenide heterobilayers mainly focused on magnetic order at half-filling or charge orders at partial fillings. Here, the authors investigate itinerant ferromagnetism in the vicinity of the van Hove singularity of moiré triangular superlattices. From many-body exact diagonalization calculations that shed light on the magnon spectra and the magnetic susceptibility, the Curie temperature is estimated to vary with moiré lattice constant, from a few to a few tens of kelvins. | | | | | | Editors' Suggestion Yang Zhang, Ling-Fang Lin, Adriana Moreo, Thomas A. Maier, and Elbio Dagotto Phys. Rev. B 109, 045151 (2024) – Published 30 January 2024  | The authors investigate here two bilayer nickelates under pressure, establishing substantial qualitative differences between the two systems. They find that the d3z2−r2 orbital in La3Ni2O6 and La3Ni2O7 plays a different role: one "active" orbital (dx2−y2) vs two "active" orbitals (eg), respectively. The Fermi surface only has two sheets in La3Ni2O6, with the γ pocket absent, different from La3Ni2O7. They also find that La3Ni2O6 is far from a superconducting instability. Moreover, they do not observe changes in the electronic density in La3Ni2O6 under pressure. | | | | | | Editors' Suggestion J. J. Wesdorp, F. J. Matute-Cañadas, A. Vaartjes, L. Grünhaupt, T. Laeven, S. Roelofs, L. J. Splitthoff, M. Pita-Vidal, A. Bargerbos, D. J. van Woerkom, P. Krogstrup, L. P. Kouwenhoven, C. K. Andersen, A. Levy Yeyati, B. van Heck, and G. de Lange Phys. Rev. B 109, 045302 (2024) – Published 3 January 2024  | Andreev bound states are fermionic states localized in weak links between superconductors, which can be occupied with spinful quasiparticles. Recently, experiments embedding a nanowire Josephson junction into a superconducting circuit have enabled coherent manipulation of a single Andreev spin. However, these experiments remained limited to small magnetic fields. Here, the authors measure the microwave spectra of a nanowire Josephson junction in magnetic fields up to ∼ 250 mT and identify singlet, doublet, and triplet states of interacting Andreev spins. | | | | | | Editors' Suggestion N. H. Kwong, M. Em. Spotnitz, and R. Binder Phys. Rev. B 109, 045306 (2024) – Published 23 January 2024  | Semiconductor lasers have formal analogies to Bardeen-Cooper-Schrieffer (BCS) superconductors. This work shows that, in analogy to gapless superconductivity, a gapless lasing parametric regime, in which the frequency gap in the fluctuation spectrum is closed, exists for steady-state semiconductor lasers. The gap opens when the laser intensity exceeds a threshold. This gapless-to-gapped transition occurs at a third-order exceptional point. | | | | | | Editors' Suggestion Prachi Sharma, Alessandro Principi, Giovanni Vignale, and Dmitrii L. Maslov Phys. Rev. B 109, 045431 (2024) – Published 24 January 2024  | The calculation of the optical conductivity of electrons in two-dimensions is a classic problem of many-body theory. It is inextricably linked with the problem of plasmon damping, where plasmons are collective oscillations of the electronic density. Here, the authors resolve discrepancies that existed in the prior literature and provide definitive results for the dependence of the optical conductivity upon wavelength, frequency, and temperature. The results are interpreted in terms of bulk and shear viscosities of the electron gas. | | | | | | Editors' Suggestion Letter Giorgio Cipolloni and Jonah Kudler-Flam Phys. Rev. B 109, L020201 (2024) – Published 3 January 2024  | The eigenstate thermalization hypothesis (ETH) represents a cornerstone in the theoretical understanding of the emergence of thermal behavior in closed quantum systems. Here, the authors investigate to what extent the ETH holds for non-Hermitian Hamiltonians, relevant for open and monitored quantum systems, and come to the surprising conclusion that fluctuations are greatly enhanced, indicating the breakdown of thermalization. | | | | | | Editors' Suggestion Letter P. Dalmas de Réotier, A. Yaouanc, G. Lapertot, C. Wang, A. Amato, and D. Andreica Phys. Rev. B 109, L020408 (2024) – Published 25 January 2024  | The authors determine here the minimal spin Hamiltonian of manganese silicide from analysis of muon spin rotation experimental data measured in its helical and conical phases. The model includes Heisenberg and Dzyaloshinskii-Moriya interactions between the Mn nearest neighbors. In particular, information is derived on the orientation of the Moriya vector that cannot be inferred from the symmetry of the Mn-Mn bond. This result enforces constraints for future theoretical works, e.g., on the origin of the stability of the magnetic skyrmions phase. | | | | | | Editors' Suggestion Letter A. C. Lee, S. Sarkar, K. Du, H.-H. Kung, C. J. Won, K. Wang, S.-W. Cheong, S. Maiti, and G. Blumberg Phys. Rev. B 109, L041111 (2024) – Published 25 January 2024  | It has been long established that collective charge oscillations of electron density relative to nuclei lattice – the bulk plasmons in metals – are typically unobservable by light scattering spectroscopy. Here, the authors report the unexpected observation of a distinct long-lived plasmon mode in the Raman spectrum of BiTeI, a material with a giant Rashba spin-orbit coupling. In contrast to conventional expectations, the findings reveal strong and direct light scattering by bulk plasmons even in the long-wavelength limit. The authors also establish the basic criteria enabling the discovered observation. | | | | | | Editors' Suggestion Letter J. Choi, J. Li, D. Van Tuan, H. Dery, and S. A. Crooker Phys. Rev. B 109, L041304 (2024) – Published 30 January 2024  | When electron-hole pairs (excitons) are photoexcited into semiconductors containing a Fermi sea of mobile charges, they can form bound states known variously as trions, tetrons, or exciton-polarons. Crucially, the interaction occurs with those mobile carriers possessing distinguishable quantum numbers (e.g., spin). In monolayer TMD semiconductors, the availability of both spin and valley quantum numbers allows excitons to interact, simultaneously, with more than one type of quantum-mechanically distinguishable carrier. This leads to new types of composite excitons (e.g., six-particle "hexcitons"), which appear as distinct resonances in optical spectra. | | | | | | Editors' Suggestion Letter S. F. Almousa, T. Weiss, and E. A. Muljarov Phys. Rev. B 109, L041410 (2024) – Published 26 January 2024  | The authors demonstrate here a linear splitting of quasidegenerate modes in the presence of chirality in optical systems. Employing the resonant-state expansion and two quasidegenerate modes, they reveal the transformation of the chirality effect on mode splitting from second to first order in the Pasteur parameter (ϰ). This linear effect is demonstrated for individual chiral particles and homogeneous chiral perturbations of metasurfaces. These findings deepen our understanding of chirality-induced mode splitting, opening prospects for innovative sensing schemes. | | | | | | | |
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