Re-entrant Negative Coulomb Drag in a 1D Quantum Circuit

Details Re-entrant Negative Coulomb Drag in a 1D Quantum Circuit Re-entrant Negative Coulomb Drag in a 1D Quantum Circuit

2010-08-30

arxiv.org/abs/1008.5155v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

We report Coulomb drag measurements between tunable vertically-coupled quantum wires. The Coulomb drag signal is mapped out versus the number of subbands occupied in each wire, and a phase diagram for a positive versus negative drag is established. When the Coulomb drag is negative, one-dimensional subbands are observed as plateau-like features in the drag signal. Negative Coulomb drag is also observed in two regimes: one at low electronic density when the drag wire is depleted, and one at higher electronic density when the drag wire has more than a single one-dimensional subband occupied. A discussion of the negative drag signal in terms of electron-hole asymmetry and localization is presented.

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