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

I. Pallecchi; F. Telesio; D. Marre'; D. Li; S. Gariglio; J. -M. Triscone; A. Filippetti

doi:10.1103/PhysRevB.93.195309

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

Strongly Correlated Electrons 2016-05-19 v1 Mesoscale and Nanoscale Physics

Authors: I. Pallecchi , F. Telesio , D. Marre' , D. Li , S. Gariglio , J. -M. Triscone , A. Filippetti

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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.

Keywords

phonon drag quantum confinement LaAlO3/SrTiO3 interface two-dimensional electron system thermoelectric power electron-phonon coupling single crystal

Cite

@article{arxiv.1605.05500,
  title  = {Large phonon-drag enhancement induced by narrow quantum confinement at the LaAlO3/SrTiO3 interface},
  author = {I. Pallecchi and F. Telesio and D. Marre' and D. Li and S. Gariglio and J. -M. Triscone and A. Filippetti},
  journal= {arXiv preprint arXiv:1605.05500},
  year   = {2016}
}

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

Abstract

Keywords

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