تقرير
Spin chirality and fermion stirring in topological bands
| العنوان: | Spin chirality and fermion stirring in topological bands |
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| المؤلفون: | Panigrahi, Archisman, Poliakov, Vladislav, Dong, Zhiyu, Levitov, Leonid |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | Spin chirality in electron gases is mandated by symmetry to be nonzero whenever time reversal symmetry (TRS) is broken. In metals, both normal and superconducting, spin chirality is generated by orbital currents present in the ground state as a result of TRS breaking. Nonzero chirality is found to emerge in the absence of any spin-dependent interactions, even when the ground state remains spin-unpolarized. We present a diagrammatic derivation of the chirality effect and illustrate its generality for problems such as valley magnetism and topological superconductivity. Spin chirality results in a chiral three-spin RKKY interaction between localized spins coupled to carriers by s-d interaction, an effect that can be detected by local probes such as spin-sensitive STM. In systems where detecting TRS breaking by macroscopic measurements is challenging, such as topological superconductors, local detection of spin chirality can serve as a reliable diagnostic of broken time reversal symmetry. Comment: 7pgs 2fgs |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2407.17433 |
| رقم الأكسشن: | edsarx.2407.17433 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |