Momentum noise in a quantum point contact

Details Momentum noise in a quantum point contact Momentum noise in a quantum point contact

2002-06-17

arxiv.org/abs/cond-mat/0206306v1

Phys.Rev.B 66, 241301(R) (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages including 4 figures

Scientific paper

10.1103/PhysRevB.66.241301

Ballistic electrons flowing through a constriction can transfer momentum to the lattice and excite a vibration of a free-standing conductor. We show (both numerically and analytically) that the electromechanical noise power P does not vanish on the plateaus of quantized conductance -- in contrast to the current noise. The dependence of $P$ on the constriction width can be oscillatory or stepwise, depending on the geometry. The stepwise increase amounts to an approximate quantization of momentum noise.

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