M62.00006. Giant thermopower in quasi-1D quantum wires at the LaAlO3/SrTiO3 interface

Presented by: Puqing Jiang


Abstract

SrTiO3-based heterointerfaces possess a plethora of new effects ranging from superconductivity to magnetism. In particular, the two-dimensional (2D) LaAlO3/SrTiO3 interface was previously shown to have highly enhanced and oscillating thermopower when back-gated close to the insulating state 1. Here we investigated the electrical and thermoelectric transport properties of quasi-one-dimensional (1D) quantum wires at the LaAlO3/SrTiO3 interface 2 at a low temperature of 100 mK. We find significantly enhanced and oscillating thermopower for the quantum wires, with values that are comparable to reports for the 2D LaAlO3/SrTiO3 interface 1. The Mott relation, which governs the diffusive thermopower of non-interacting electrons, works surprisingly well despite the highly ballistic nature of electron transport and evidence of electron-electron interaction in these quantum wires. Our results suggest that the highly enhanced thermopower in 2D SrTiO3-based systems may originate from naturally formed quasi-1D channels at the heterointerfaces.

Authors

  • Puqing Jiang
  • Yuhe Tang
  • Jeremy Levy


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