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BEGIN:VEVENT
DTSTAMP:20260427T235115Z
DTSTART;VALUE=DATE-TIME:20260119T130000
DTEND;VALUE=DATE-TIME:20260119T140000
SUMMARY:WCPM: Balazs Ujfalussy\, Wigner Research Centre
TZID:Europe/London
UID:20260119-8ac672c59b9d1d78019b9d96c2bd03df@warwick.ac.uk
CREATED:20260108T123101Z
DESCRIPTION:Networking Lunch: The Recharge Room\, next to Lecture Theatre
  004\, from 12:30pm - 1pm. Title: Superconducting properties of Fe/Au/Nb
  heterostructures form first principles Abstract: The characteristic fea
 ture of superconductors (SCs) is the macroscopic occupation of bound pai
 rs of electrons\, known as Cooper pairs\, in the same quantum-coherent g
 round state described by a complex superconducting order parameter (SOP)
 . In homogeneous s-wave SCs this is accompanied by a fully gapped quasip
 article spectrum. However\, if the SOP varies in space\, lower energy\, 
 subgap excitations may be formed. These so-called Andreev Bound States (
 ABS)\, are the consequence of Andreev scattering in which an incoming el
 ectron-like state can convert into an outgoing hole-like one. The classi
 cal example of such systems is the superconductor - normal metal – super
 conductor (SNS) junctions which is characterized by a non-zero phase dif
 ference between the SOP belonging to the two superconductors. While a gr
 eat many theoretical works were dedicated to study the Andreev reflectio
 n and the ABS it was done on model systems only\, their material specifi
 c dispersion\, their "band structure" received much less attention. The 
 first step was done by Annett and coworkers\, and the next logical step 
 in this series of investigations is first principles calculations for re
 al materials. This can be based on the density functional theory in the 
 superconducting state already developed by Oliveira\,Gross and Kohn in 1
 988. In this talk\, I generalize the fully relativistic screened Korring
 a-Kohn-Rostoker (SKKR) method for solving the corresponding Kohn-Sham-Di
 rac-Bogoliubov-de Gennes (KSDBdG) equations for surfaces and interfaces.
  As a first and most simple application we study the quasiparticle spect
 rum of Au overlayers on Nb host. We find that\, within the superconducti
 ng gap region\, the quasiparticle spectrum consists of Andreev bound sta
 tes (ABS) with a dispersion which is closely connected to the underlying
  electronic structure of the overlayer. When combined with a semi-phenom
 enological parameterization of the electron-phonon coupling a material s
 pecific model arises to calculate the superconducting critical temperatu
 re from the thickness dependence. In the case of Au/Nb heterostructures 
 we obtain a very good agreement with experiments. Moreover\, predictions
  can be made for similar heterostructures of other compounds. Extending 
 our calculations to Fe covered Nb and Nb/Au multilayers\, we show that t
 he order parameters exhibit a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) li
 ke oscillations in the iron layers\, but more interestingly an oscillato
 ry behavior is observed in the gold layers as well. The band structure c
 alculations suggest that this is the consequence of an interplay between
  the quantum-well states and ferromagnetism\, and show a rather similar 
 oscillatory behavior of the critical temperature observed in experiments
 . Similarly\, experiments in epitaxial Nb/Au/Nb trilayers\, the critical
  current density\, the superconducting coherence length and the supercon
 ducting transition temperature are all show an oscillating behavior as a
  function of the Au-layer thickness. Such behavior cannot be understood 
 based on simple models of the Josephson effect. Using first principles t
 heory\, we study the effects of spin-orbit coupling\, and the effect of 
 confinement and show that they induce a complex structure of ABS which i
 n turn modifies the quasi-particle spectrum and the Josephson supercurre
 nt. Our study reveals the coexistence of two superconducting phases in t
 he gold layers\, the usual intraband s-wave phase and an additional FFLO
  phase stemming from interband pairing (without magnetic field). The res
 ults indicate the rich interplay between quantum size and proximity effe
 cts which suggests the possibility of modifying superconducting transpor
 t properties by exploiting thickness-dependent quantum size effects. Bio
 : Balazs Ujfalussy received his PhD in 1993 from Eötvös University\, Bud
 apest. He was a visiting scientist at the Technical University of Vienna
 \, Austria\, the University of Bristol\, England and for seven years he 
 was a research fellow at the Oak Ridge National Laboratory in the USA. H
 is research interests are related to the electronic states of metals and
  alloys in the normal and superconducting state\, and the modelling of m
 agnetic states in condensed matter from first principles. He is the head
  of Department of Theoretical Solid State Physics at the Wigner Research
  Centre for Physics and also a head of a research group. A winner of sev
 eral awards at home and abroad\, including the IEEE Gordon Bell Prize an
 d the EU Descartes prize. He served as the general secretary of the Rola
 nd Eötvös Physical Society and still an active member of the governing b
 oard.
LOCATION:Lecture Theatre 0.04 IMC
URL:
ATTACH:
CATEGORIES:WCPM
LAST-MODIFIED:20260108T123101Z
ORGANIZER;CN=Jin Kang:
END:VEVENT
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