BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1440
DTSTART:20090925T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260417T151523Z
LAST-MODIFIED:20090821T171916Z
LOCATION:2241 Chamberlin Hall (coffee and cookies at 3:30 pm)
SUMMARY:New Phenomena at Oxide Interfaces\, Physics Department Colloqu
 ium\, Jean-Marc Triscone\, University of Geneva
DESCRIPTION:At interfaces between complex oxides\, electronic systems 
 with unusual properties can be generated [see for instance 1\,2]. A st
 riking example is the interface between LaAlO3 and SrTiO3\, two good i
 nsulating perovskite oxides\, which was found in 2004 to be conducting
  with a high mobility [3]. We discovered that the ground state of this
  system is a superconducting condensate\, with a critical temperature 
 of about 200 mK [4]. The characteristics observed for the superconduct
 ing transitions are consistent with a two-dimensional superconducting 
 sheet a few nanometers thick. Recent field effect experiments revealed
  the sensitivity of the normal and superconducting states to the carri
 er density. In particular\, the electric field allows the tuning of th
 e critical temperature between 200 mK and 0 K and thus the on-off swit
 ching of superconductivity\, revealing a complex phase diagram and a s
 uperconductor to insulator transition[5]. Recent results suggest that 
 this phase diagram is linked to the large interfacially generated spin
 -orbit coupling. I will discuss the perspectives opened by this new fi
 eld of research sometimes called "oxide interface engineering".<br>
\n
 [1] "When oxides meet face to face." E. Dagotto\, Science 318\, 1076 (
 2007).<br>
\n[2] "Enter the oxides." J. Heber\, Nature 459\, 28 (2009)
 .<br>
\n[3] "A high mobility electron gas at the LaAlO3/SrTiO3 heteroi
 nterface." A. Ohtomo\, H. Y. Hwang\, Nature 427\, 423 (2004). <br>
\n[
 4] "Superconducting interfaces between insulating oxides." N. Reyren\,
  S. Thiel\, A. D. Caviglia\, L. Fitting Kourkoutis\, G. Hammerl\, C. R
 ichter\, C. W. Schneider\, T. Kopp\, A.-S. Ruetschi\, D. Jaccard\, M. 
 Gabay\, D. A. Muller\, J.-M. Triscone and J. Mannhart\, Science 317\, 
 1196 (2007).<br>
\n[5] "Electric field control of the LaAlO3/SrTiO3 in
 terface ground state." A. Caviglia\, S. Gariglio\, N. Reyren\, D. Jacc
 ard\, T. Schneider\, M. Gabay\, S. Thiel\, G. Hammerl\, J. Mannhart\, 
 and J.-M. Triscone\, Nature 456\, 624 (2008).<br>
\n
URL:https://www.physics.wisc.edu/events/?id=1440
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