Scientific Council of the Landau Institute, Friday, June 22, 2018, Landau Institute, 11:30 am|
L. Glazman (Yale University)
Quantum Many-Body Physics of Qubits
The ongoing development of superconducting qubits has brought some basic questions of many-body physics to the research forefront, and in some cases helped solving them. I will address two effects in quantum condensed matter highlighted by the development of a fluxonium qubit. The first one is the so-called cosine-phi problem stemming from the seminal paper of Brian Josephson: the predicted there phase dependence of the dissipative current across a Josephson junction was observed in a fluxonium, after nearly 50 years of unsuccessful attempts by other techniques. The second one is the dynamics of a weakly-pinned charge density wave: we predict that the dynamics may be revealed in measurements of microwave reflection off a superinductor, which is a key element of the fluxonium.
Laboratory building, room 122
Moscow Institute of Physics and Technology
contact e-mail address: email@example.com (head M.V.Feigel'man, deputy head I.V.Zagorodnev)Research topics
Theory seminar, Thursday, June 7, 2018, Kapitza Institute, 11:30 am|
A.Yu. Kuntsevich (FIAN)
Elektronnye svoistva dopirovannykh khal'kogenidov vismuta
Khal'kogenidy vismuta yavlyayutsya topologicheskimi izolyatorami s naibol'shimi shirinami zapreshchennoi zony. Pri dopirovanii Bi2Se3 med'yu, strontsiem ili niobiem Bi2Se3 stanovitsya sverkhprovodyashchim (predpolozhitel'no, nematicheskim topologicheskim sverkhprovodnikom).
V doklade budet dan obzor imeyushchikhsya na segodnyashnii den' dannykh o nematicheskoi sverkhprovodimosti dannogo materiala, v tom chisle i nashi rezul'taty o korrelyatsii nematichnosti so strukturnymi iskazheniyami [arXiv:1801.09287].
Takzhe ya rasskazhu o chasto obsuzhdaemom v literature izmerenii fazy Berri iz magnitoostsillyatsii. Nami privedeny prostye makroskopicheskie argumenty [Phys. Rev. B 97, 195431 (2018)], pochemu v real'nykh topologicheskikh izolyatorakh eta faza mozhet sil'no otlichat'sya ot teoreticheski ozhidaemogo znacheniya.