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, November 28, 2025, ITF, 3:00 pm

Nazar Sichuk

Manipulation of Néel-type skyrmions by the non-uniform electric field

My izuchaem teoreticheski vozmozhnost' upravleniya skirmionami tipa Neelya s pomoshch'yu neodnorodnogo elektricheskogo polya, istochnikom kotorogo sluzhit tonkii zaryazhennyi zond. Elektricheskoe pole deistvuet na neodnorodnuyu namagnichennost' blagodarya magnitoelektricheskomu effektu, chto bylo predskazano eshche v 1980kh, no tol'ko nedavno podverzhdeno v eksperimente: pole privodit k smeshcheniyu domennykh stenok i rozhdeniyu domenov. Ispol'zuya analiticheskii podkhod, my pokazyvaem, chto etot zhe effekt dolzhen privodit' v dvizhenie skirmiony, izmenyat' ikh razmer, a takzhe sozdavat' i unichtozhat' ikh. Krome togo, elektricheskoe pole mozhet sozdavat' i podderzhivat' sushchestvovanie skirmionov otritsatel'noi kiral'nosti, a takzhe skirmioniumov. My detal'no issledovali usloviya i znacheniya parametrov, pri kotorykh mozhno realizovat' vysheukazannoe, i sostavili fazovuyu diagrammu v koordinatakh "rasstoyanie do zonda - intensivnost' polya", pokazyvayushchuyu sootvetstvuyushchie vozmozhnosti. Krome togo, my predlagaem teoreticheskii proekt ustroistva, v kotorom neskol'ko zondov mogut peremeshchat', sozdavat' i unichtozhat' skirmiony. Analiticheskie rezul'taty verifitsirovany chislennym mikromagnitnym modelirovanie.

Department of quantum mesoscopics: seminar, Friday, November 21, 2025, ITF, 3:00 pm

Zaur Alisultanov (MFTI)

Indutsirovannye besporyadkom topologicheskie perekhody v mul'tisloinom topologicheskom izolyatore

Ispol'zuya prostuyu model' Burkova-Balentsa, my issledovali vliyanie nemagnitnogo besporyadka na elektronnye sostoyaniya mnogosloinoi struktury, sostoyashchei iz sloev kak topologicheskikh, tak i obychnykh dielektrikov. My poluchili fazovye diagrammy v zavisimosti ot urovnya besporyadka, pokazyvaya, chto nemagnitnyi besporyadok mozhet indutsirovat' perekhody mezhdu razlichnymi topologicheskimi fazami.

Dalee, my issledovali elektronnye svoistva mnogosloinogo topologicheskogo izolyatora (MTI) v usloviyakh nediagonal'nogo besporyadka, kogda parametry mezhsloinogo tunnelirovaniya fluktuiruyut ot sloya k sloyu. Snachala my reshili zadachu dlya edinichnogo nediagonal'nogo defekta, pri kotorom v sisteme prisutstvuet odin sloi s tunnel'nym parametrom, otlichnym ot ostal'nykh. Takoi defekt indutsiruet svyazannoe sostoyanie vnutri zapreshchennoi zony. Zavisimost' energii etogo sostoyaniya ot sily vozmushcheniya sushchestvenno razlichaetsya v trivial'noi i topologicheskoi fazakh MTI, chto delaet takuyu zavisimost' universal'nym lokal'nym indikatorom topologicheskogo poryadka.

Ispol'zuya prostoe diagrammnoe razlozhenie my vychislili plotnost' sostoyanii (PS) dlya chetyrekh topologicheskikh faz, realizuemykh v etoi sisteme: normal'nyi izolyator, topologicheskii izolyator, polumetall Veilya i faza anomal'nogo kvantovogo effekta Kholla (AKEKh). Nediagonal'nyi besporyadok porozhdaet novye ob'emnye sostoyaniya v shcheli i mozhet privesti k razrusheniyu topologicheskikh faz.

Nakonets, my izuchili vliyanie nediagonal'nogo besporyadka na lokalizatsiyu kraevykh mod v MTI. My otsenili dlinu lokalizatsii dlya trekh raspredelenii besporyadka: ravnomernogo, gaussova i lorentseva. Nediagonal'nyi besporyadok sokhranyaet kiral'nost', no pri etom mozhet sposobstvovat' delokalizatsii kraevykh mod i tunnelirovaniyu mezhdu nimi, podryvaya topologicheskuyu zashchitu. My vychislili popravku k prodol'noi kraevoi provodimosti, voznikayushchuyu iz-za tunnel'nykh effektov, i pokazali, chto takoi besporyadok mozhet vyzyvat' otklonenie kraevoi provodimosti ot kvantovannogo znacheniya.

Z.Z. Alisultanov, A. Kudlis, Phys. Rev. B 109, 165141 (2024) Z.Z. Alisultanov, A. Kudlis, Phys. Rev. B 112, 205108 (2025)