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Control superconductivity between two insulators with a electric field

Physicists from the LNCMI took part in the following collaboration:

In this Letter, we show that a superconducting two-dimensional electron gas is formed at the LaTiO3/SrTiO3 interface whose transition temperature can be modulated by a back-gate voltage. The gas consists of two types of carriers: a majority of low-mobility carriers always present, and a few high-mobility ones that can be injected by electrostatic doping. The calculation of the electron spatial distribution in the confinement potential shows that the high-mobility electrons responsible for superconductivity set at the edge of the gas whose extension can be tuned by the field effect.

© 2012 American Physical Society

 

For more details see: http://prl.aps.org/pdf/PRL/v108/i24...