The electrical conductivity of the two-dimensional (2D) electron gas at the interface of epitaxially grown ultrathin films of LaTiO3 on SrTiO3 shows a large gain upon near-UV excitation. The gain in conductivity can be turned on or off by the application of a gate voltage of correct polarity. This feature of the 2D gas should allow realization of optoelectronic devices whose functionality can be enhanced by sequential application of an electric field and light. © 2010 WILEY-VCH Verlag GmbH &amp; Co. KGaA, Weinheim.

Ankur Rastogi

Department of Physics

School of Advanced Sciences

Vellore Campus

A.K. Kushwaha

T. Shiyani

A. Gangawar

R.C. Budhani

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Advanced Materials

Electrically tunable optical switching of a Mott insulator-band insulator interface

Journal	Advanced Materials
ISSN	09359648