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

Abstract

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.

References in corpus (15)

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Cited by in corpus (3)

• Colossal Seebeck coefficient in Aurivillius Phase-Perovskite Oxide Composite
• Enhancement of electron mobility at oxide interfaces induced by WO3 overlayers
• Realizing Thermoelectric and Thermistor Bi-functionalities via Triggering Electron Correlations with Lattice-dipole