Probing Pauli Blocking Factors in Quantum Pumps with Broken Time-Reversal Symmetry

Details Probing Pauli Blocking Factors in Quantum Pumps with Broken Time-Reversal Symmetry Probing Pauli Blocking Factors in Quantum Pumps with Broken Time-Reversal Symmetry

2000-06-21

arxiv.org/abs/cond-mat/0006331v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages in RevTex4 (beta4), 6 figures; status: to appear in PRL

Scientific paper

10.1103/PhysRevLett.85.174

A recently demonstrated quantum electron pump is discussed within the framework of photon-assisted tunneling. Due to lack of time-reversal symmetry, different results are obtained for the pump current depending on whether or not final-state Pauli blocking factors are used when describing the tunneling process. Whilst in both cases the current depends quadratically on the driving amplitude for moderate pumping, a marked difference is predicted for the temperature dependence. With blocking factors the pump current decreases roughly linearly with temperature until k_B T ~ \hbar\omega is reached, whereas without them it is unaffected by temperature, indicating that the entire Fermi sea participates in the electronic transport.

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