Signatures of Electronic Nematicity in (111) LaAlO/SrTiO Interfaces
arXiv:1708.04809 · doi:10.1103/PhysRevB.97.041408
Abstract
Symmetry breaking is a fundamental concept in condensed matter physics whose presence often heralds new phases of matter. For instance, the breaking of time reversal symmetry is traditionally linked to magnetic phases in a material, while the breaking of gauge symmetry can lead to superfluidity/superconductivity. Nematic phases are phases in which rotational symmetry is broken while maintaining translational symme- try, and are traditionally associated with liquid crystals. Electronic nematic states where the or- thogonal in-plane crystal directions have different electronic properties have garnered a great deal of attention after their discovery in SrRuO, multiple iron based superconductors, and in the superconducting state of CuBiSe. Here we demonstrate the existence of an electronic ne- matic phase in the two-dimensional carrier gas that forms at the (111) LaAlO (LAO)/SrTiO (STO) interface that onsets at low temperatures, and is tunable by an electric field.
6 pages 3 figures
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