Low-dissipation edge currents without edge states
We propose that bulk free carriers in topologically trivial multivalley insulators with nonvanishing Berry curvature can give rise to low-dissipation edge currents, which are squeezed within a distance on the order of the valley diffusion length from the edge. This happens even in the absence of edg...
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sg-ntu-dr.10356-1380382023-02-28T19:51:09Z Low-dissipation edge currents without edge states Song, Justin Chien Wen Vignale, Giovanni School of Physical and Mathematical Sciences Institute of High Performance Computing, A*STAR Science::Physics Edge Currents Carrier Concentration We propose that bulk free carriers in topologically trivial multivalley insulators with nonvanishing Berry curvature can give rise to low-dissipation edge currents, which are squeezed within a distance on the order of the valley diffusion length from the edge. This happens even in the absence of edge states [topological (gapless) or otherwise], and when the bulk equilibrium carrier concentration is thermally activated across the gap. Physically, the squeezed edge current arises from the spatially inhomogeneous valley orbital magnetization that develops from valley-density accumulation near the edge. While this current possesses neither topology nor symmetry protection and, as a result, is not immune to dissipation, in clean enough devices it can mimic low-loss ballistic transport. NRF (Natl Research Foundation, S’pore) Published version 2020-04-22T06:34:40Z 2020-04-22T06:34:40Z 2019 Journal Article Song, J. C. W., & Vignale, G. (2019). Low-dissipation edge currents without edge states. Physical Review B, 99(23), 235405-. doi:10.1103/PhysRevB.99.235405 2469-9950 https://hdl.handle.net/10356/138038 10.1103/PhysRevB.99.235405 2-s2.0-85067196564 23 99 235405-1 235405-8 en Physical Review B © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society. application/pdf |
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Science::Physics Edge Currents Carrier Concentration Song, Justin Chien Wen Vignale, Giovanni Low-dissipation edge currents without edge states |
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We propose that bulk free carriers in topologically trivial multivalley insulators with nonvanishing Berry curvature can give rise to low-dissipation edge currents, which are squeezed within a distance on the order of the valley diffusion length from the edge. This happens even in the absence of edge states [topological (gapless) or otherwise], and when the bulk equilibrium carrier concentration is thermally activated across the gap. Physically, the squeezed edge current arises from the spatially inhomogeneous valley orbital magnetization that develops from valley-density accumulation near the edge. While this current possesses neither topology nor symmetry protection and, as a result, is not immune to dissipation, in clean enough devices it can mimic low-loss ballistic transport. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Song, Justin Chien Wen Vignale, Giovanni |
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Article |
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Song, Justin Chien Wen Vignale, Giovanni |
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Song, Justin Chien Wen |
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Low-dissipation edge currents without edge states |
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Low-dissipation edge currents without edge states |
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Low-dissipation edge currents without edge states |
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Low-dissipation edge currents without edge states |
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Low-dissipation edge currents without edge states |
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low-dissipation edge currents without edge states |
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2020 |
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https://hdl.handle.net/10356/138038 |
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