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[Fizinfo] Szemináriumok - Seminars: Újfalussy Balázs

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  • From: Szeminárium koordinátor <sem-admin AT>
  • To: SZFI User <szfkiuser AT>,Fizinfo <fizinfo AT>
  • Cc: Fizinfo <fizinfo AT>
  • Subject: [Fizinfo] Szemináriumok - Seminars: Újfalussy Balázs
  • Date: Thu, 26 Jan 2023 06:00:01 +0100 (CET)
  • Authentication-results: (amavisd-new); dkim=pass (1024-bit key) reason="pass (just generated, assumed good)"

SZFI SeminarÚjfalussy BalázsWigner RCP SZFIZero energy modes of artificial
spin chains from first principlesTuesday, 31 January 2023, 10:00, KFKI
Campus, Bldg. 1, 2nd floor, Conference RoomMajorana Zero Modes (MZM) at the
ends of a chain of magnetic atoms on the surface of a superconductor been of
high interest over the past few years triggered by their possible
applications as fault tolerant quantum bits. However, experimentally it is
still very challenging to uniquely identify MZMs based solely on the spectral
properties. In such a situation first-principles calculations are especially
helpful, both in identifying and in designing such topological systems. In
this talk we present a first-principles computational approach based on a
microscopic relativistic theory of inhomogeneous superconductivity to
scrutinize edge states of magnetic chains deposited on the surface of
superconductors. We investigate in great detail an iron chain on the top of
Au-covered Nb(110) chain and we make quantitative predictions on various
properties of the chain based on quantities well beyond the reach of
experimental capabilities to uniquely identify the topological phase. We
confirm that ferromagnetic Fe chains on Au/Nb(110) surface do not support any
MZM; however, a broad range of spin-spirals can be identified with a robust
zero energy state displaying signatures of MZMs. For these spirals, we
explore the structure of various superconducting order parameters and the
role of spin-orbit coupling. Through additional computational experiments, we
provide evidence that MZMs are localized to the boundaries of the topological
region of the chain. The robustness of the MZM states is also demonstrated,
representing a huge step toward potential experimental realizations. Join
ID: 892 2799 4088Passcode: 626366&nbsp;Minden érdeklődőt szívesen látunk! -
Everyone is welcome to attend.Attila Nagysem-admin AT

  • [Fizinfo] Szemináriumok - Seminars: Újfalussy Balázs, Szeminárium koordinátor, 01/26/2023

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