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BEGIN:VEVENT
DTSTAMP:20260626T170804Z
DTSTART;VALUE=DATE-TIME:20151027T130000
DTEND;VALUE=DATE-TIME:20151027T140000
SUMMARY:Alix McCollam
TZID:Europe/London
UID:20151027-094d43f55037e98d01504b9dba680663@warwick.ac.uk
CREATED:20151009T080039Z
DESCRIPTION:Tuning the carrier density and sub-band properties at the LaA
 lO3/SrTiO3 interface. Alix McCollam. High Field Magnet Laboratory\, Radb
 oud University Nijmegen\, The Netherlands. Oxides of transition metals h
 ave complex phase diagrams and a rich variety of ground states\, where s
 trong correlations between electrons mean that small adjustments of comp
 osition or structure can greatly change the properties of a system. Comb
 ining oxides in artificial heterostructures\, by building up layers of a
 tomically perfect thin films\, provides the opportunity to engineer syst
 ems with specific functionalities. Moreover\, heterostructures offer the
  possibility of properties at the interface which are not found in the b
 ulk components. This approach was proven to be highly successful for III
 -V semiconductors\, and is now showing signs of being equally fruitful f
 or oxides\, where a highly conducting 2-dimensional electron gas\, which
  is also sometimes superconducting or magnetic\, is found at interfaces 
 between SrTiO3 and several other insulating perovskite oxides. I will gi
 ve a short introduction to the physics of oxide heterostructures and pre
 sent the results of high field magnetotransport measurements on the LaAl
 O3/SrTiO3 system. Quantum oscillations observed in the resistivity and H
 all effect allow us to probe the bandstructure of the interface electron
  gas\, and give information about the properties of the mobile charge ca
 rriers. I will briefly discuss our current theoretical understanding of 
 the interface electronic properties and how it relates to experiments\, 
 and will also present very recent measurements\, in which we used the el
 ectric field effect to tune the carrier density of the electron gas and 
 control the evolution of the conduction bandstructure and carrier proper
 ties. References: A. McCollam et al.\, Quantum oscillations and subband 
 properties of the two-dimensional electron gas at the LaAlO3/SrTiO3 inte
 rface. APL Materials 2\, 022102 (2014). L. van Heeringen\, et al.\, k.p 
 subband structure of the LaAlO3/SrTiO3 interface. Phys. Rev. B {\\bf 88}
 \, 205140 (2013)
LOCATION:P5.23
CATEGORIES:Condensed Matter Physics Seminar
LAST-MODIFIED:20151021T075538Z
ORGANIZER;CN=Jon Duffy:
END:VEVENT
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