Kavli Affiliate: Andrea D. Caviglia
| First 5 Authors: , , , ,
| Summary:
Quantum materials are characterized by electromagnetic responses
intrinsically linked to the geometry and topology of electronic wavefunctions,
encoded in the quantum metric and Berry curvature. Whereas Berry
curvature-mediated transport effects have been identified in several magnetic
and nonmagnetic systems, quantum metric-induced transport phenomena remain
limited to topological antiferromagnets. Here we show that spin-momentum
locking — a general characteristic of the electronic states at surfaces and
interfaces of spin-orbit coupled materials — leads to a finite quantum metric.
This metric activates a nonlinear in-plane magnetoresistance that we measure
and electrically control in 111-oriented LaAlO$_3$/SrTiO$_3$ interfaces. These
findings demonstrate the existence of quantum metric effects in a vast class of
materials and enable previously unexplored strategies to design functionalities
based on quantum geometry.
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