Landau Institute for theoretical physics

Department of quantum mesoscopics

Address:
142432, Chernogolovka, Moscow region
acad. Semenov prosp., 1a
119334, Moscow
Kosygin st., 2
Phone: ++7-495-702-93-17
Fax: ++7-495-702-93-17
Phone: ++7-495-137-32-44
Fax: ++7-495-938-20-77
e-mail: qmeso@itp.ac.ru
Research topics
  • Mesoscopic electronic systems
  • Superconducting hybrid structures
  • Quantum phase transitions
  • Spintronics
  • 2DEG and quantum Hall effect
  • Quantum magnetism and topological order
  • Physics of quantum computation
Recent seminars
Department of quantum mesoscopics: seminar, Friday, April 17, 2026, ITF, 3:00 pm

D.S. Katkov, M.V. Parfenov, I.S. Burmistrov

Mikroskopicheskaya model' kiral'nykh fermionov dlya spinovogo kvantovogo effekta Kholla.

Spinovyi kvantovyi effekt Kholla yavlyaetsya rodstvennikom tselochislennogo kvantovogo effekta Kholla, kharakterizuyushchegosya tselochislenno kvantovannoi spinovoi khollovskoi provodimost'yu. V dannoi rabote formuliruetsya i issleduetsya model' odnomernykh provodakh s N kanalov na kazhdom i so sluchainym tunnelirovaniem mezhdu kanalami. Rassmatrivaemaya model' sokhranyaet fundamental'nye simmetrii spinovogo kvantovogo effekta Kholla. Prodemonstrirovano, chto v obshchem sluchae tripletnyi sektor teorii ne ottseplyaetsya ot singletnogo sektora. V predele bol'shikh N sistematicheski vyvoditsya effektivnaya krupnomasshtabnaya nizkoenergeticheskaya teoriyu polya, predstavlyayushchaya soboi nelineinuyu sigma-model'. Analiz pokazyvaet, chto, khotya tripletnye mody obychno massivny i ne vliyayut na nelineinuyu sigma-model' bol'shikh N, sushchestvuyut opredelennye usloviya, pri kotorykh eti mody stanovyatsya «myagkimi», tem samym uvelichivaya dlinu ul'trafioletovoi obrezki modeli. Krome togo, pri vychislenii zatravochnykh prodol'noi i khollovskoi spinovykh provodimostei, obnaruzhivaetsya, chto standartnoe priblizhenie sedlovoi tochki ne rabotaet v rezhimakh so znachitel'noi tunnel'noi asimmetriei mezhdu chetnymi i nechetnymi zven'yami. Ustanavlivleno, chto vvedenie zeemanovskogo polya ne tol'ko narushaet simmetriyu SU(2) deistviya nelineinoi sigma-modeli, no i porozhdaet chlen, kotoryi yavno narushaet inversionnuyu simmetriyu.