Electrical magnetochiral anisotropy in Rashba superconductors
DOI (Low Temperature Physics):
https://doi.org/10.1063/10.0046092Ключові слова:
magnetochiral anisotropy, Ginzburg–Landau theory, spin-orbit coupling, Lifshitz invariantsАнотація
Теоретично досліджено роль інваріантів Ліфшиця вищого порядку в невзаємному переносі заряду в двовимірних нецентросиметричних надпровідниках зі спін-орбітальним зв’язком Рашби. У надпровідному стані ці симетрично дозволені члени призводять до невзаємності критичного струму, тоді як у нормальному стані поблизу надпровідного переходу вони генерують виражену магнітохіральну анізотропію. Використовуючи методи групової теорії з обмеженнями симетрії, систематично побудовано дозволені інваріанти Ліфшиця та виведено відповідну векторну структуру невзаємного струму. Для опису нелінійного переносу в режимі флуктуацій застосовано узагальнену залежну від часу теорію Гінзбурга–Ландау, яка включає як внесок Асламазова–Ларкіна від індукованих флуктуаціями куперівських пар, так і внесок Макі–Томпсона, пов’язаний з квантовою інтерференцією в куперівському каналі. Також проаналізовано вплив розсіювання невпорядкованості та дефазування на підсумкову невзаємну реакцію.
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