Interface*

We report the electrical and thermoelectric transport properties of quantum wires at the LaAlO₃/SrTiO₃ interface at milli-Kelvin temperatures. A highly enhanced and oscillating thermopower shows up with values exceeding 100 uV/K in the electron depletion regime. The thermopower is correlated with the band structure in the nanowire and well described by the Mott relation. These findings pave the way to study electronic structures of quantum wires at LaAlO₃/SrTiO₃ with thermal transport technique and can further lead to the understanding of quantization of thermal conductance and other exotic electronic phases in LaAlO₃/SrTiO₃ systems.