Single-electron coherence: Finite temperature versus pure dephasing |
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Affiliation: | 1. Department of Metal and Semiconductor Physics, NTU “Kharkiv Polytechnic Institute”, 61002 Kharkiv, Ukraine;2. University of Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France;3. CEA, INAC-SPSMS, F-38000 Grenoble, France;1. State Key Laboratory of ASIC and System, School of Information Science and Technology, Fudan University, Shanghai 200433, China;2. Solid-State Electronics, The Ångström Laboratory, Uppsala University, Box 534, Uppsala SE-751 21, Sweden;1. Dipartimento di Matematica e Fisica, Università Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy;2. Nano-Bio Spectroscopy Group, Departamento de Fìsica de Materiales, Universidad del Paìs Vasco UPV/EHU, E-20018 San Sebastiàn, Spain;1. Yerevan State University, Faculty of Physics, Department of Solid State Physics, 1 Al. Manoogian, Yerevan 0025, Armenia;2. State Engineering University of Armenia, 105, V. Teryan, Yerevan 0009, Armenia |
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Abstract: | We analyze a coherent injection of single electrons on top of the Fermi sea in two situations, at finite-temperature and in the 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-electron 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-electron states to the case of mixed states and clarifies the difference between different types of mixedness. |
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Keywords: | Floquet scattering matrix Quantum transport Single-electron source Mixed state Shot noise measurements 73.23.-b 72.10.-d 73.63.-b |
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