Robust phase coherent effects observed in nonlinear transport in KTaO<sub>3</sub> interfaces
Oral-In-person · Withdrawn
Abstract
The two-dimensional electron system (2DES) at the surface of KTaO3 can become superconducting, with a critical temperature that depends on the crystallographic surface orientation. We investigate nonlinear transport on several KTaO3 surfaces over wide ranges of temperature, magnetic-field orientation and magnitude, and in-plane current direction.
We show that nonlinear magnetotransport reveals phase-coherent electron dynamics arising from multiple interfering trajectories even when device dimensions exceed the phase-coherence length Lφ. This contrasts with linear-response interference effects, which average out in macroscopic devices. By tuning gate voltage and magnetic field, we modulate the interference patterns in the nonlinear response and use them to extract the underlying electron-diffusion characteristics.
These results establish nonlinear transport as a sensitive probe of phase-coherent phenomena and electron correlations in 2D materials, extending interference studies well beyond the mesoscopic regime.
We show that nonlinear magnetotransport reveals phase-coherent electron dynamics arising from multiple interfering trajectories even when device dimensions exceed the phase-coherence length Lφ. This contrasts with linear-response interference effects, which average out in macroscopic devices. By tuning gate voltage and magnetic field, we modulate the interference patterns in the nonlinear response and use them to extract the underlying electron-diffusion characteristics.
These results establish nonlinear transport as a sensitive probe of phase-coherent phenomena and electron correlations in 2D materials, extending interference studies well beyond the mesoscopic regime.
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Presenters
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Yoram Dagan
- Tel Aviv University