Abstract:We calculate the magnetic-field dependent nonlinear conductance and noise in a two-dimensional macroscopic inhomogeneous system. If the system does not possess a specific symmetry, the magnetic field induces a nonzero third cumulant of the current even at equilibrium. This cumulant is related to the first and second voltage derivatives of the spectral density and average current in the same way as for mesoscopic quantum-coherent systems, but these quantities may be much larger. The system provides a robust tes… Show more
“…Finally, we note that the present demonstration gives a single example of the validity of the microreversibility in the nonequilibrium quantum regime in the presence of the magnetic field. This fundamental topic should be experimentally addressed in many systems such as electron interferometers 14,15,38 , the quantum dot 39 , and the macroscopic inhomogeneous system 40 .…”
Mesoscopic systems provide us a unique experimental stage to address nonequilibrium quantum statistical physics. By using a simple tunneling model, we describe the electron exchange process via a quantum coherent conductor between two reservoirs, which yields the fluctuation theorem (FT) in mesoscopic transport. We experimentally show that such a treatment is semiquantitatively validated in the current and noise measurement in an Aharonov-Bohm ring. The experimental proof of the microreversibility assumed in the derivation of FT is presented.
“…Finally, we note that the present demonstration gives a single example of the validity of the microreversibility in the nonequilibrium quantum regime in the presence of the magnetic field. This fundamental topic should be experimentally addressed in many systems such as electron interferometers 14,15,38 , the quantum dot 39 , and the macroscopic inhomogeneous system 40 .…”
Mesoscopic systems provide us a unique experimental stage to address nonequilibrium quantum statistical physics. By using a simple tunneling model, we describe the electron exchange process via a quantum coherent conductor between two reservoirs, which yields the fluctuation theorem (FT) in mesoscopic transport. We experimentally show that such a treatment is semiquantitatively validated in the current and noise measurement in an Aharonov-Bohm ring. The experimental proof of the microreversibility assumed in the derivation of FT is presented.
“…13,14 A powerful and elegant formulation in this semiclassical regime is the stochastic path integral approach, which was introduced for FCS in the pioneering works by Pilgram et al [15][16][17] For interacting systems, the FCS can be related to a generalized master equation describing the charge transport [18][19][20][21] or obtained using Keldysh Greens functions.…”
Section: 10-12mentioning
confidence: 99%
“…(14), to a different statistical distribution, with high-order factorial cumulants governed by Eq. (21).…”
Full counting statistics concerns the stochastic transport of electrons in mesoscopic structures. Recently it has been shown that the charge transport statistics for noninteracting electrons in a two-terminal system is always generalized binomial: it can be decomposed into independent singleparticle events, and the zeros of the generating function are real and negative. Here we investigate how the zeros of the generating function move into the complex plane due to interactions and demonstrate that the positions of the zeros can be detected using high-order factorial cumulants. As an illustrative example we consider electron transport through a Coulomb blockade quantum dot for which we show that the interactions on the quantum dot are clearly visible in the high-order factorial cumulants. Our findings are important for understanding the influence of interactions on counting statistics, and the characterization in terms of zeros of the generating function provides us with a simple interpretation of recent experiments, where high-order statistics have been measured.
“…Full counting statistics has found widespread use in theories of quantum electronic circuits, for instance in proposals for detecting entanglement [9,10], revealing interactions [11,12], understanding quasi-probabilities [13][14][15][16], or observing Majorana modes [17][18][19][20][21]. Intimate connections to fluctuation relations at the nano-scale [22][23][24][25][26][27][28][29] and to entanglement entropy in fermionic many-body systems [30][31][32][33][34] have also been discovered.Despite these promising applications, experiments remain scarce. Measurements of FCS are demanding as they require accurate detection of rare events in the tails of the distributions.…”
We propose a dynamical scheme for measuring the full-counting statistics in a mesoscopic conductor using an electronic Mach-Zehnder interferometer. The conductor couples capacitively to one arm of the interferometer and causes a phase shift which is proportional to the number of transferred charges. Importantly, the full-counting statistics can be obtained from average current measurements at the outputs of the interferometer. The counting field can be controlled by varying the time delay between two separate voltage signals applied to the conductor and the interferometer, respectively. As a specific application, we consider measuring the entanglement entropy generated by partitioning electrons on a quantum point contact. Our scheme is robust against moderate environmental dephasing and may be realized thanks to recent advances in gigahertz quantum electronics.
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