Topological micromotion of Floquet quantum systems

Author(s): Peng Xu, Wei Zheng, and Hui ZhaiThe Floquet Hamiltonian has often been used to describe a time-periodic system. Nevertheless, because the Floquet Hamiltonian depends on a micromotion parameter, the Floquet Hamiltonian with a fixed micromotion parameter cannot faithfully represent a time-periodic system, which manifests as the anom...[Phys....

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Local symmetry breaking and magnetic properties of acceptor-donor codoped ${\mathrm{Ca}}_{3}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ hybrid improper ferroelectrics

Author(s): Yu Zhao, Wenyue Zhao, Weili Li, Ze Li, Zhao Wang, Yazhou Peng, Lidong Wang, and Wei-Dong FeiLayered hybrid improper ferroelectrics are very important for multiferroic devices; however, it has been very challenging to obtain multiferroic properties at room temperature. In this study we report that acceptor-donor codoping can be used to realize...

42m

Exact quantum scars in the chiral nonlinear Luttinger liquid

Author(s): Frank Schindler, Nicolas Regnault, and B. Andrei BernevigWhile the chiral linear Luttinger liquid is integrable via bosonization, its nonlinear counterpart does not admit of an analytic solution. Nonetheless, the authors find a number of exact eigenstates for a large family of density-density interaction terms. These quantum many-body scar...

42m

High-field magnetic structure of the triangular antiferromagnet $\mathrm{RbFe}({\mathrm{MoO}}_{4}{)}_{2}$

Author(s): Yu. A. Sakhratov, O. Prokhnenko, A. Ya. Shapiro, H. D. Zhou, L. E. Svistov, A. P. Reyes, and O. A. PetrenkoThe magnetic H−T phase diagram of a quasi-two-dimensional antiferromagnet RbFe(MoO4)2 (S=5/2) with an equilateral triangular lattice structure is studied with Rb87 NMR and neutron-diffraction techniques. This combination of experimental...

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Analytic exposition of the graviton modes in fractional quantum Hall effects and its physical implications

Author(s): Yuzhu Wang and Bo YangNeutral excitations in a fractional quantum Hall droplet define the incompressibility gap of the topological phase. In this paper, we derive a set of analytical results for the energy gap of the graviton modes with two-body and three-body Hamiltonians in both the long-wavelength and the thermodynami...[Phys. Rev. B 105,...

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Magnon-phonon interaction and the underlying role of the Pauli exclusion principle

Author(s): T. J. Sjöstrand and F. AryasetiawanThe magnon-phonon interaction is receiving growing attention due to its key role in spin caloritronics and the emerging field of acoustic spintronics. At resonance, this magnetoelastic interaction forms magnon polarons, which underpin exotic phenomena such as magnonic heat currents and phononic spin...[Phys....

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Low-frequency Raman response near the Ising-nematic quantum critical point: A memory-matrix approach

Author(s): Xiaoyu Wang and Erez BergRecent Raman scattering experiments have revealed a quasielastic peak in FeSe1−xSx near an Ising-nematic quantum critical point (QCP) [Zhang et al., PNAS 118, 20 (2021)]. Notably, the peak occurs at subtemperature frequencies, and softens as Tα when temperature is decreased toward the QCP, with α&g...[Phys. Rev....

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Pseudospin-phonon pretransitional dynamics in lead halide hybrid perovskites

Author(s): B. Hehlen, P. Bourges, B. Rufflé, S. Clément, R. Vialla, A. C. Ferreira, C. Ecolivet, S. Paofai, S. Cordier, C. Katan, A. Létoublon, and J. EvenThe low-frequency lattice vibrations and relaxations are investigated in single crystals of the four 3D hybrid organolead perovskites, MAPbBr3, FAPbBr3, MAPbI3, and α−FAPbI3, at the Brillouin zone...

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Simultaneous fermion and exciton condensations from a model Hamiltonian

Author(s): LeeAnn M. Sager and David A. MazziottiFermion-exciton condensation in which both fermion-pair (i.e., superconductivity) and exciton condensations occur simultaneously in a single coherent quantum state has recently been conjectured to exist. Here, we capture the fermion-exciton condensation through a model Hamiltonian that can recreate ...[Phys....

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Three-dimensional critical behavior and anisotropic magnetic entropy change in quasi-two-dimensional ${\mathrm{LaCrSb}}_{3}$

Author(s): Xiaojun Yang, Junxiao Pan, Weizhuo Gai, Yaping Tao, Hong Jia, Leiming Cao, and Yan CaoThe critical properties and magnetic entropy change of quasi-two-dimensional LaCrSb3 single crystals have been systematically investigated. The ferromagnetic transition is determined to be of a second order. Critical exponents β=0.298(7) with a critical...

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