BEGIN:VCALENDAR
PRODID:-//SiteBuilder 2//University of Warwick ITS Web Team//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-TIMEZONE:Europe/London
X-LIC-LOCATION:Europe/London
BEGIN:VTIMEZONE
TZID:Europe/London
LAST-MODIFIED:20201010T011803Z
TZURL:http://tzurl.org/zoneinfo/Europe/London
X-LIC-LOCATION:Europe/London
X-PROLEPTIC-TZNAME:LMT
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+000115
TZOFFSETTO:+0000
DTSTART:18471201T000000
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19160521T020000
RDATE:19170408T020000
RDATE:19180324T020000
RDATE:19190330T020000
RDATE:19200328T020000
RDATE:19210403T020000
RDATE:19220326T020000
RDATE:19230422T020000
RDATE:19240413T020000
RDATE:19270410T020000
RDATE:19300413T020000
RDATE:19330409T020000
RDATE:19340422T020000
RDATE:19350414T020000
RDATE:19380410T020000
RDATE:19390416T020000
RDATE:19400225T020000
RDATE:19460414T020000
RDATE:19470316T020000
RDATE:19480314T020000
RDATE:19490403T020000
RDATE:19530419T020000
RDATE:19540411T020000
RDATE:19570414T020000
RDATE:19600410T020000
RDATE:19680218T020000
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19161001T030000
RDATE:19170917T030000
RDATE:19180930T030000
RDATE:19190929T030000
RDATE:19201025T030000
RDATE:19211003T030000
RDATE:19221008T030000
RDATE:19391119T030000
RDATE:19471102T030000
RDATE:19481031T030000
RDATE:19491030T030000
RDATE:19711031T030000
END:STANDARD
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19230916T030000
RRULE:FREQ=YEARLY;UNTIL=19240921T020000Z;BYMONTH=9;BYMONTHDAY=16,17,18,19
 ,20,21,22;BYDAY=SU
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19250419T020000
RRULE:FREQ=YEARLY;UNTIL=19260418T020000Z;BYMONTH=4;BYMONTHDAY=16,17,18,19
 ,20,21,22;BYDAY=SU
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19251004T030000
RRULE:FREQ=YEARLY;UNTIL=19381002T020000Z;BYMONTH=10;BYMONTHDAY=2,3,4,5,6,
 7,8;BYDAY=SU
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19280422T020000
RRULE:FREQ=YEARLY;UNTIL=19290421T020000Z;BYMONTH=4;BYMONTHDAY=16,17,18,19
 ,20,21,22;BYDAY=SU
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19310419T020000
RRULE:FREQ=YEARLY;UNTIL=19320417T020000Z;BYMONTH=4;BYMONTHDAY=16,17,18,19
 ,20,21,22;BYDAY=SU
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19360419T020000
RRULE:FREQ=YEARLY;UNTIL=19370418T020000Z;BYMONTH=4;BYMONTHDAY=16,17,18,19
 ,20,21,22;BYDAY=SU
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:BDST
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
DTSTART:19410504T020000
RDATE:19450402T020000
RDATE:19470413T020000
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
DTSTART:19410810T030000
RRULE:FREQ=YEARLY;UNTIL=19430815T010000Z;BYMONTH=8;BYMONTHDAY=9,10,11,12,
 13,14,15;BYDAY=SU
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:BDST
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
DTSTART:19420405T020000
RRULE:FREQ=YEARLY;UNTIL=19440402T010000Z;BYMONTH=4;BYMONTHDAY=2,3,4,5,6,7
 ,8;BYDAY=SU
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
DTSTART:19440917T030000
RDATE:19450715T030000
RDATE:19470810T030000
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19451007T030000
RRULE:FREQ=YEARLY;UNTIL=19461006T020000Z;BYMONTH=10;BYMONTHDAY=2,3,4,5,6,
 7,8;BYDAY=SU
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19500416T020000
RRULE:FREQ=YEARLY;UNTIL=19520420T020000Z;BYMONTH=4;BYMONTHDAY=14,15,16,17
 ,18,19,20;BYDAY=SU
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19501022T030000
RRULE:FREQ=YEARLY;UNTIL=19521026T020000Z;BYMONTH=10;BYMONTHDAY=21,22,23,2
 4,25,26,27;BYDAY=SU
END:STANDARD
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19531004T030000
RRULE:FREQ=YEARLY;UNTIL=19601002T020000Z;BYMONTH=10;BYMONTHDAY=2,3,4,5,6,
 7,8;BYDAY=SU
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19550417T020000
RRULE:FREQ=YEARLY;UNTIL=19560422T020000Z;BYMONTH=4;BYMONTHDAY=16,17,18,19
 ,20,21,22;BYDAY=SU
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19580420T020000
RRULE:FREQ=YEARLY;UNTIL=19590419T020000Z;BYMONTH=4;BYMONTHDAY=16,17,18,19
 ,20,21,22;BYDAY=SU
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19610326T020000
RRULE:FREQ=YEARLY;UNTIL=19630331T020000Z;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19611029T030000
RRULE:FREQ=YEARLY;UNTIL=19671029T020000Z;BYMONTH=10;BYMONTHDAY=23,24,25,2
 6,27,28,29;BYDAY=SU
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19640322T020000
RRULE:FREQ=YEARLY;UNTIL=19670319T020000Z;BYMONTH=3;BYMONTHDAY=19,20,21,22
 ,23,24,25;BYDAY=SU
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:BST
TZOFFSETFROM:+0100
TZOFFSETTO:+0100
DTSTART:19681026T230000
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19720319T020000
RRULE:FREQ=YEARLY;UNTIL=19800316T020000Z;BYMONTH=3;BYMONTHDAY=16,17,18,19
 ,20,21,22;BYDAY=SU
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19721029T030000
RRULE:FREQ=YEARLY;UNTIL=19801026T020000Z;BYMONTH=10;BYMONTHDAY=23,24,25,2
 6,27,28,29;BYDAY=SU
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19810329T010000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19811025T020000
RRULE:FREQ=YEARLY;UNTIL=19891029T010000Z;BYMONTH=10;BYMONTHDAY=23,24,25,2
 6,27,28,29;BYDAY=SU
END:STANDARD
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19901028T020000
RRULE:FREQ=YEARLY;UNTIL=19951022T010000Z;BYMONTH=10;BYDAY=4SU
END:STANDARD
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0000
TZOFFSETTO:+0000
DTSTART:19960101T000000
END:STANDARD
BEGIN:STANDARD
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19961027T020000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTAMP:20261006T214450Z
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
END:VCALENDAR