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SUMMARY:THE EXCITING NEW SCIENCE AT OXIDE INTERFACES
DTSTART:20130517T141500
DTSTAMP:20260509T025407Z
UID:ccf04f8ed051548f2930370f17e66d4497c6313b136913c4b6bae9ed
CATEGORIES:Conferences - Seminars
DESCRIPTION:I. Bozovic\, Brookhaven National Laboratory\, Upton NY 11973\,
  USA\nOxide Interface Science. The last decade has witnessed explosive gro
 wth of research on various oxide hetero-structures\, and discoveries of ex
 citing new interface phenomena. We may be witnessing the emergence of Oxid
 e Interface Science\, a new field delineated by a distinct new set of prob
 lems\, techniques\, phenomena\, and theoretical concepts.\nElectronic and/
 or atomic reconstruction. In hetero-structures. there is always some misma
 tch between the two constituents - crystallographic (different lattice con
 stants)\, electrostatic (violation of local charge neutrality) or dynamic 
 (difference in chemical potentials). Consequences are numerous and profoun
 d. The atomic structure can be strained and modified\; electronic and/or a
 tomic reconstruction may occur\, including formation of oxygen and/or cati
 on vacancies as well as large atomic displacements.\nMetastability. Most h
 etero-structures are not thermodynamically stable\; the synthesis is at le
 ast in part kinetically controlled and the atoms are frozen in one out of 
 many nearly-degenerate metastable states. The actual atomic structure at t
 he interface is thus basically impossible to predict. To determine it expe
 rimentally\, new tools and techniques for study of buried interfaces are r
 equired\, and being developed fast.\n2D quantum confinement. Digital synth
 esis of complex oxides – one-unit-cell or even one-atomic-layer at a tim
 e - yields ultrathin layers with atomically sharp interfaces. Electrons ca
 n be extremely confined in\none direction\, while propagating with high mo
 bility in-plane. Ultrathin metals\, superconductors\, ferromagnets or ferr
 oelectrics host new phenomena\, such as massive critical fluctuations\, th
 ermal or quantum.\nProximity effects. Interesting new physics occurs also 
 when the two materials exhibit different broken symmetries and order param
 eters. Competing instabilities\, if finely balanced\, can result in extrem
 e susceptibility and colossal responses to small perturbations. These may 
 find applications in sensing\, ultrafast non-volatile switching\, etc.\, a
 nd is hoped to eventually beget new Oxide Electronics.\nIn this lecture\, 
 a number of simple examples will be given\, largely drawn from my own prac
 tice with atomic-layer-by-layer molecular beam epitaxy (ALL-MBE) of high-T
 c cuprate superconductors\, but intended to illustrate the more general co
 ncepts listed above.\nReferences:\nTorchinsky et al.\, Nature Mater. 12\, 
 387 (2013)FULL TEXT\nDean et al.\, Nature Mater.12\, 47 (2013)FULL TEXT\nS
 hi et al.\, Nature Mater. 11\, 850 (2012)FULL TEXT\nBollinger et al.\, Nat
 ure 472\, 458 (2011)FULL TEXT\nBilbro et al.\, Nature Phys. 7\, 298 (2011)
 FULL TEXT\nMorenzoni et al.\, Nature Comm. 2\, 272 (2011)FULL TEXT\nSochni
 kov et al.\, Nature Nanotech. 5\, 516 (2010)FULL TEXT\nLogvenov et al.\, S
 cience 326\, 699 (2009)FULL TEXT\nGozar et al.\, Nature 455\, 782 (2008)FU
 LL TEXT\nGedik et al.\, Science 316\, 425 (2007)FULL TEXT\nBozovic et al.\
 , Nature 422\, 873 (2003)FULL TEXT\nAbbamonte et al.\, Science 297\, 581 (
 2002) FULL TEXT
LOCATION:PH L1 503 http://plan.epfl.ch/?room=PHL1503
STATUS:CONFIRMED
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