Combined IFA and Specialized iNANO lecture
- open to all
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 two‐dimensional 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 surface‐sensitive, techniques such as angle-resolved photoemission (ARPES). Here, I will discuss our APRES studies of surface‐localized 2DEGs in both semiconducting and complex oxides. These reveal striking departures from the conventional picture of semiconductor 2DEG physics, including pronounced depth‐dependent band gap shrinkage effects [3], lifting of orbital degeneracy induced by quantum confinement of a multi‐orbital 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