Forward scattering probe of edge-state coupling in the quantum Hall regime

Yeong Ah Soh; Yeong Ah Soh; Frank M. Zimmermann; Harold G. Craighead

doi:10.1103/PhysRevB.64.153303

Forward scattering probe of edge-state coupling in the quantum Hall regime

Yeong Ah Soh, Yeong Ah Soh, Frank M. Zimmermann, Harold G. Craighead

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

We report on magnetoconductance measurements of a submicrometer-wide constriction in a two-dimensional electron gas with a tunable central gate. For negative central gate biases, an edge channel loop forms around the central-gate potential hump and couples to reflected edge channels, opening a forward scattering pathway. From the conductance contribution of this pathway we deduce that the transmission probability for tunneling between adjacent edge channels of different Landau levels is 0.5, corresponding to the strong-coupling limit, for a coupling region of only a few hundred nanometers in length.

Original language	English (US)
Article number	153303
Pages (from-to)	1533031-1533034
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	64
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevB.64.153303
State	Published - Oct 15 2001

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.64.153303

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abstract = "We report on magnetoconductance measurements of a submicrometer-wide constriction in a two-dimensional electron gas with a tunable central gate. For negative central gate biases, an edge channel loop forms around the central-gate potential hump and couples to reflected edge channels, opening a forward scattering pathway. From the conductance contribution of this pathway we deduce that the transmission probability for tunneling between adjacent edge channels of different Landau levels is 0.5, corresponding to the strong-coupling limit, for a coupling region of only a few hundred nanometers in length.",

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AU - Soh, Yeong Ah

AU - Zimmermann, Frank M.

AU - Craighead, Harold G.

PY - 2001/10/15

Y1 - 2001/10/15

N2 - We report on magnetoconductance measurements of a submicrometer-wide constriction in a two-dimensional electron gas with a tunable central gate. For negative central gate biases, an edge channel loop forms around the central-gate potential hump and couples to reflected edge channels, opening a forward scattering pathway. From the conductance contribution of this pathway we deduce that the transmission probability for tunneling between adjacent edge channels of different Landau levels is 0.5, corresponding to the strong-coupling limit, for a coupling region of only a few hundred nanometers in length.

AB - We report on magnetoconductance measurements of a submicrometer-wide constriction in a two-dimensional electron gas with a tunable central gate. For negative central gate biases, an edge channel loop forms around the central-gate potential hump and couples to reflected edge channels, opening a forward scattering pathway. From the conductance contribution of this pathway we deduce that the transmission probability for tunneling between adjacent edge channels of different Landau levels is 0.5, corresponding to the strong-coupling limit, for a coupling region of only a few hundred nanometers in length.

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Forward scattering probe of edge-state coupling in the quantum Hall regime

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