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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2536
DTSTART:20120510T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260409T132437Z
LAST-MODIFIED:20120507T185015Z
LOCATION:5310 Chamberlin
SUMMARY:Shedding Light on Artificial Quantum Materials and Interfaces 
 by Photoemission Spectroscopy\, R. G. Herb Condensed Matter Seminar\, 
 Kyle Shen\, Cornell University
DESCRIPTION:Our ability to control electronic properties at semiconduc
 tor interfaces has had enormous scientific and technological implicati
 ons. Extending this idea beyond the familiar semiconductors\, one can 
 now construct thin films of artificial "quantum" materials with atomic
  layer precision. With these new systems lies the promise of taking ad
 vantage of their strong quantum many-body interactions at interfaces o
 r with dimensionality to control their electronic and magnetic propert
 ies. This is a new frontier in condensed matter physics\, but to fully
  understand what happens in these artificial quantum materials\, one r
 equires advanced tools for both spectroscopy and synthesis. To achieve
  this\, we have developed a new approach which combines oxide molecula
 r beam epitaxy (MBE) with high-resolution angle-resolved photoemission
  spectroscopy (ARPES). As one example\, I will describe our work on di
 gital manganite superlattices ([LaMnO3]2n / [SrMnO3]n)\, comprised of 
 alternating LaMnO3 and SrMnO3 blocks. Our ARPES measurements reveal th
 at by controlling the separation between the LaMnO3-SrMnO3 interfaces\
 , we can drive the interfacial quasiparticle states from 3D ferromagne
 tic metal\, to a 2D polaron liquid\, and finally to a pseudogapped fer
 romagnetic insulator. I will also describe some of our work on thin fi
 lms of the elusive "infinite layer" cuprate Sr1-xLaxCuO2\, which we ca
 n stabilize epitaxially\, thus allowing us to address fundamental issu
 es regarding the asymmetry between doping electrons and holes in the h
 igh-Tc cuprates.
URL:https://www.physics.wisc.edu/events/?id=2536
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