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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
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Large Nonlinear Transverse Conductivity and Berry Curvature in KTaO3 Based Two-Dimensional Electron Gas.
Jinfeng Zhai1, Mattia Trama2,3,4, Hao Liu1
1State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China.
Nano Letters
|December 11, 2023
Summary
Large nonlinear conductivities were observed in two-dimensional electron gas (2DEG) at oxide interfaces without a magnetic field. Skew scattering and Berry curvature hotspots drive these exotic electronic properties, paving the way for new oxide electronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Physics
Background:
- Two-dimensional electron gases (2DEGs) at oxide interfaces display unique properties due to symmetry breaking.
- Interfacial phenomena in oxides are crucial for novel electronic functionalities.
Purpose of the Study:
- Investigate large nonlinear transverse conductivities in the LaAlO3/KTaO3 interface 2DEG.
- Identify the underlying mechanisms and explore potential applications in oxide electronics.
Main Methods:
- Experimental measurement of nonlinear transverse conductivities under zero magnetic field.
- Theoretical calculations to understand the role of Berry curvature and band structure.
Main Results:
- Observed large nonlinear transverse conductivities, attributed to skew scattering.
- Demonstrated gate-tunable nonlinear transport with distinct peak and dip features.
- Identified Berry curvature hotspots with magnitudes exceeding those in transition-metal dichalcogenides.
Conclusions:
- Skew scattering and Berry curvature hotspots are key to the observed nonlinear transport.
- Nonlinear transport provides a novel method for probing Berry curvature at oxide interfaces.
- These findings enable new applications in oxide nonlinear electronics.
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