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SUMMARY:Materials design and functionality in oxide heterostructures   - C
 hristos Panagopoulos\, Division of Physics and Applied Physics\, Nanyang T
 echnological\,University\, Singapore
DTSTART:20130919T130000Z
DTEND:20130919T140000Z
UID:TALK47349@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:Favorable conditions for improved and miniaturized electronics
  require tunable functions in clean systems at the nanoscale. However\, th
 e methods required to fabricate the desired devices are not yet capable of
  meeting the necessary size\, reproducibility\, and tenability for useful 
 functional compounds. On the other hand\, heterostructures offer an appeal
 ing route to create a variety of states emerging from interfacial coupling
 s and reduced-dimensionality effects. Indeed\, sharp\, clean interfaces\, 
 was one of the enabling factors leading to the revolution in modern semico
 nductor technologies and to the discovery of some of the most exotic forms
  of electronic matter\, including the Quantum Hall Effect and the Fraction
 al Quantum Hall Effect. Recently\, in the family of transition metal oxide
 s the diversity of phenomena discovered\, from exotic superconducting phas
 es to unconventional magnetic and ferroelectric behaviors\, in digitally s
 ynthesized heterostructures is particularly spectacular. Here the emergent
  science and technology based on strong spin\, charge\, orbital and lattic
 e interactions at nanometer thick interfaces promises to overcome the impa
 sse faced today on scaling and compatibility issues by using materials abu
 ndant in synthetic chemistry.   \n\nI will discuss our effort to understan
 d and employ properties of quantum mechanics to develop systems with funct
 ionalities arising from a collective interaction of electrons in a heteros
 tructure. Our laboratory has served as a coordinated “scientific instrum
 ent” to study and exploit materials discoveries. Further to the depositi
 on methods for materials growth\, we develop and employ in-house technique
 s including miniature magnetometers\, thermal and electrical measurement a
 pparatuses to the millikelvin regime and high fields\, which complement ou
 r experiments using x-ray\, neutron and muon techniques at international f
 acilities. More recently we designed and built a “quiet island” inside
  the Nanyang Technological University. This prototype noise-free structure
 \, which includes a materials and device fabrication platform\, scanning p
 robes and electronic transport measurements in a single ultra-high-vacuum 
 environment aims at the design and growth of materials\, and devices to pe
 rform fundamental studies and develop reliable methods for information tec
 hnology.\n \nThe talk will also demonstrate typical examples of systems wh
 ere by varying the composition of the individual layers of a heterostructu
 re\, the substrate material and selective external perturbations we may no
 w control the interfacial properties over a broad range. The high degree o
 f tunability achieved promises structures and devices with electromagnetic
  properties controllable at the atomic monolayer level.\n
LOCATION:TCM Seminar Room (530)\, Cavendish Laboratory\, Department of Phy
 sics
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