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The thermoelectric properties of quasi‐1D electron waveguides at the LaAlO3/SrTiO3 interface at millikelvin temperatures are investigated. A highly enhanced and oscillating thermopower is found for these electron waveguides, with values exceeding 100 μV K−1 at 0.1 K in the electron‐depletion regime. The Mott relation, which governs the band‐term thermopower of noninteracting electrons, agrees well...
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