Single-electron coherence: finite temperature versus pure dephasing
arXiv:1506.09028 · doi:10.1016/j.physe.2015.09.002
Abstract
We analyze a coherent injection of single electrons on top of the Fermi sea in two situations, at finite-temperature and in presence of pure dephasing. Both finite-temperature and pure dephasing change the property of the injected quantum states from pure to mixed. However, we show that the temperature-induced mixedness does not alter the coherence properties of these single-electronic states. In particular two such mixed states exhibit perfect antibunching while colliding at an electronic wave splitter. This is in striking difference with the dephasing-induced mixedness which suppresses antibunching. On the contrary, a single-particle shot noise is suppressed at finite temperatures but is not affected by pure dephasing. This work therefore extends the investigation of the coherence properties of single-electronic states to the case of mixed states and clarifies the difference between different types of mixedness.
17 pages, 6 figures, invited contribution to a special issue in Physica E on "Frontiers in quantum electronic transport" - in memory of Markus Büttiker
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