4.8 Article

Resonant thermal Hall effect of phonons coupled to dynamical defects

出版社

NATL ACAD SCIENCES
DOI: 10.1073/pnas.2215141119

关键词

thermal hall; phonons; cuprates; dynamical defects

资金

  1. NSF [NSF PHY-1748958, DMR-2002850]
  2. Simons Collaboration on Ultra-Quantum Matter through Simons Foundation [651440]
  3. Heising-Simons Foundation
  4. Simons Foundation
  5. Leopoldina Fellowship through German National Academy of Sciences [LPDS 2020-01]

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In this study, we calculate the thermal Hall coefficient of phonons scattering off a defect with multiple energy levels. Our results show that the perturbative contribution in the phonon-defect coupling is proportional to the phonon lifetime and has a side-jump interpretation. We also find that the thermal Hall angle is independent of the phonon lifetime.
We present computations of the thermal Hall coefficient of phonons scattering off a defect with multiple energy levels. Using a microscopic formulation based on the Kubo formula, we find that the leading contribution perturbative in the phonon-defect coupling is proportional to the phonon lifetime and has a side-jump interpretation. Consequently, the thermal Hall angle is independent of the phonon lifetime. The contribution to the thermal Hall coefficient is at resonance when the phonon energy equals a defect-level spacing. Our results are obtained for three different defect models, which apply to different correlated electron materials. For the pseudogap regime of the cuprates, we propose a model of phonons coupled to an impurity quantum spin in the presence of quasistaticmagnetic order with an isotropic Zeeman coupling to the applied field and without spin-orbit interaction.

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