Large phonon-drag enhancement induced by narrow quantum confinement at the LaAlO3/SrTiO3 interface
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...
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| Veröffentlicht in: | Physical review. B 2016-05, Vol.93 (19) |
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| container_title | Physical review. B |
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| creator | Pallecchi, I Telesio, F Marre, D Li, D Gariglio, S Triscone, J-M Filippetti, A |
| description | 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. |
| doi_str_mv | 10.1103/PhysRevB.93.195309 |
| format | Article |
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| subjects | Amplification Condensed matter Confinement Coupling Signatures Strontium titanates Thermoelectricity Two dimensional |
| title | Large phonon-drag enhancement induced by narrow quantum confinement at the LaAlO3/SrTiO3 interface |
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