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Publication Detail / Abstract

I. Pallecchi, F. Telesio, D. Marré, D. Li, S. Gariglio, J.-M. Triscone, A. Filippetti

Large phonon-drag enhancement induced by narrow quantum confinement at the LaAlO3/SrTiO3 interface

published in Physical Review B on May 12, 2016
> Full text via publisher
The thermoelectric power of the two-dimensional electron system (2DES) at the LaAlO3/SrTiO3 interface is explored below room temperature, in comparison with that of Nb-doped SrTiO3 single crystals. For the interface, we find a region below T = 50 K where thermopower is dominated by phonon drag, whose amplitude is hugely amplified with respect to the corresponding bulk value, reaching values ∼mV/K and above. The phonon-drag enhancement at the interface is traced back to the tight carrier confinement of the 2DES, and represents a sharp signature of strong electron-acoustic phonon coupling at the interface.
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