Single-electron second-order correlation function G((2)) at nonzero temperatures

Article

关键词: HANBURY-BROWN;    SCATTERING-THEORY;    COHERENT STATES;    QUANTUM OPTICS;    SHOT-NOISE;   

DOI  :  10.1103/PhysRevB.98.115421

来源: SCIE

【 摘 要 】

The single-particle state is not expected to demonstrate second-order coherence. Here I analyze the injection of electrons into a conductor and show that, at a nonzero temperature, the underlying Fermi sea causes the single-particle injected state to exhibit second-order coherence. For this purpose, I calculate the second-order correlation function, G((2)), of electrons injected on top of the Fermi sea. At zero temperature, the function G((2)) unambiguously demonstrates whether the injected state is a single- or a multiparticle state: G((2)) vanishes in the former case, while it does not vanish in the latter case. However, at nonzero temperatures, when the injected state is a mixed state, a purely single-particle contribution makes the function G((2)) nonvanishing even in the case of injection of one electron. The single-particle contribution puts the lower limit on the second-order correlation function and thereby limits its use as a single-particle injection test at nonzero temperatures. The existence of a single-particle contribution to G((2)) can be verified experimentally by measuring the cross-correlation electrical noise.

【 授权许可】

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