Combined IFA and Specialized iNANO lecture
- open to all
 
Post doc. Phil King
School of Physics and Astronomy,
University of St Andrews
UK
 
Title:               Spectroscopic investigation of surface 2DEGs in semiconducting and complex oxides
 
Time:              Thursday 4 August 2011, at 11:15am
                       
Location:        1525-323, Department of Physics
 
Abstract:      A twodimensional electron gas (2DEG) at the interface between two semiconductors is a central component of many electronic devices, and their realization at the interface of oxide materials is widely expected to shape the future of electronics [1]. The recent observation that similar 2DEGs can exist at the surface of oxides [2] opens up new pathways for their spectroscopic investigation using advanced, but surfacesensitive, techniques such as angle-resolved photoemission (ARPES). Here, I will discuss our APRES studies of surfacelocalized 2DEGs in both semiconducting and complex oxides. These reveal striking departures from the conventional picture of semiconductor 2DEG physics, including pronounced depthdependent band gap shrinkage effects [3], lifting of orbital degeneracy induced  by quantum confinement of a multiorbital system, and the  role of electron correlations [4]. Numerous collaborations  on this work are gratefully acknowledged.
 
References: 
[1] Mannhart and Scholm, Science 327 (2010) 1607
[2] King et al., Phys. Rev. Lett. 101 (2008) 116808
[3] King et al.,  Phys. Rev. Lett.  104 (2010) 256803
[4] Meevasana, King et al., Nature Mater.  10 (2011) 114
 
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