Kavli Affiliate: Andrea D. Caviglia
| First 5 Authors: Eylon Persky, Xi Wang, Giacomo Sala, Thierry C. van Thiel, Edouard Lesne
| Summary:
Identifying orbital textures and their effects on the electronic properties
of quantum materials is a critical element in developing orbitronic devices.
However, orbital effects are often entangled with the spin degree of freedom,
making it difficult to uniquely identify them in charge transport phenomena.
Here, we present a combination of scanning superconducting quantum interference
device (SQUID) current imaging, global transport measurements, and theoretical
analysis, that reveals a direct contribution of orbital textures to the linear
charge transport of 2D systems. Specifically, we show that in the
LaAlO$_3$/SrTiO$_3$ interface, which lacks both rotation and inversion
symmetries, an anisotropic orbital Rashba coupling leads to conductivity
anisotropy in zero magnetic field. We experimentally demonstrate this result by
locally measuring the conductivity anisotropy, and correlating its appearance
to the non-linear Hall effect, showing that the two phenomena have a common
origin. Our results lay the foundations for an all–electrical probing of
orbital currents in two-dimensional systems.
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