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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Titolo: | Large phonon-drag enhancement induced by narrow quantum confinement at the LaAlO3/SrTiO3 interface |
Autori: | |
Data di pubblicazione: | 2016 |
Rivista: | |
Handle: | http://hdl.handle.net/11567/855092 |
Appare nelle tipologie: | 01.01 - Articolo su rivista |