Nakata, Kouki and Klinovaja, Jelena and Loss, Daniel. (2017) Magnonic quantum Hall effect and Wiedemann-Franz law. Physical Review B, 95 (12). p. 125429.
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Official URL: https://edoc.unibas.ch/60930/
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Abstract
We present a quantum Hall effect of magnons in two-dimensional clean insulating magnets at finite temperature. Through the Aharonov-Casher effect, a magnon moving in an electric field acquires a geometric phase and forms Landau levels in an electric field gradient of sawtooth form. At low temperatures, the lowest energy band being almost flat carries a Chern number associated with a Berry curvature. Appropriately defining the thermal conductance for bosons, we find that the magnon Hall conductances get quantized and show a universal thermomagnetic behavior, i.e., are independent of materials, and obey a Wiedemann-Franz law for magnon transport. We consider magnons with quadratic and linear (Dirac-like) dispersions. Finally, we show that our predictions are within experimental reach for ferromagnets and skyrmion lattices with current device and measurement techniques.
Faculties and Departments: | 05 Faculty of Science > Departement Physik > Physik > Theoretical Nano/Quantum Physics (Klinovaja) |
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UniBasel Contributors: | Klinovaja, Jelena |
Item Type: | Article, refereed |
Article Subtype: | Research Article |
Publisher: | American Physical Society |
ISSN: | 2469-9950 |
e-ISSN: | 2469-9969 |
Note: | Publication type according to Uni Basel Research Database: Journal article |
Language: | English |
Identification Number: | |
edoc DOI: | |
Last Modified: | 07 Mar 2018 14:47 |
Deposited On: | 07 Mar 2018 14:47 |
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