Negative electron-electron drag between narrow quantum Hall channels

Article

关键词: SPATIALLY SEPARATED ELECTRON;    RANDOM-PHASE-APPROXIMATION;    COULOMB DRAG;    HOLE TRANSPORT;    GAS LAYERS;    FRICTION;    DENSITY;   

DOI  :  10.1103/PhysRevB.57.6561

来源: SCIE

【 摘 要 】

Momentum transfer due to Coulomb interaction between two parallel, two-dimensional, narrow, and spatially separated layers, when a current I-drive is driven through one layer, is studied in the presence of a perpendicular magnetic field B. The current induced in the drag layer I-drag is evaluated self-consistently with l(drive) as a parameter. I-drag can be positive or negative depending 017 the value of the filling factor v of the highest occupied bulk Landau level (LL). For a fully occupied LL, I-drag is negative, (i.e., it flows opposite to I-drive), whereas it is positive for a half-filled LL. When the circuit is opened in the drag layer, a voltage Delta V-drag develops in it; it is negative for a half-filled LL and positive fora-Fully occupied LL. This Positive Delta V-drag, expressing a negative Coulomb drag, results from energetically favored neat-edge inter-LL transitions that occur when the highest occupied bulk LL and the LL just above it become degenerate.

【 授权许可】

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