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We study the current noise through an unbiased quantum electron pump and its mesoscopic fluctuations for arbitrary temperatures and beyond the bilinear response. In the bilinear regime, we find the full distributions of the noise power and…

介观与纳米尺度物理 · 物理学 2009-11-07 M. L. Polianski , M. G. Vavilov , P. W. Brouwer

We study mesoscopic fluctuations and weak localization correction to the supercurrent in Josephson junctions with coherent diffusive electron dynamics in the normal part. Two kinds of junctions are considered: a chaotic dot coupled to…

介观与纳米尺度物理 · 物理学 2008-03-10 M. Houzet , M. A. Skvortsov

A comprehensive model for the photon number fluctuations and the current noise in quantum cascade lasers is presented. It is shown that the photon intensity noise in quantum cascade lasers exhibits little amplitude squeezing even when noise…

介观与纳米尺度物理 · 物理学 2009-11-07 Farhan Rana , Rajeev J. Ram

We derive the symmetrized current-noise spectrum of a quantum dot, which is weakly tunnel-coupled to an electron reservoir and driven by a slow time-dependent gate voltage. This setup can be operated as an on-demand emitter of single…

介观与纳米尺度物理 · 物理学 2018-09-12 Niklas Dittmann , Janine Splettstoesser

We study the fluctuation statistics of integrated currents in noisy quantum diffusive systems, focusing on the Quantum Symmetric Simple Exclusion and Inclusion Processes (QSSEP/QSSIP). These one-dimensional fermionic (QSSEP) and bosonic…

统计力学 · 物理学 2026-01-26 Mathias Albert , Denis Bernard , Tony Jin , Stefano Scopa , Shiyi Wei

We consider a double quantum dot coupled to two normal leads and one superconducting lead, modeling the Cooper pair beam splitter studied in two recent experiments. Starting from a microscopic Hamiltonian we derive a general expression for…

介观与纳米尺度物理 · 物理学 2011-03-25 D. Chevallier , J. Rech , T. Jonckheere , T. Martin

We propose an approach allowing the computation of currents and their correlations in interacting multiterminal mesoscopic systems involving quantum dots coupled to normal and/or superconducting leads. The formalism relies on the expression…

介观与纳米尺度物理 · 物理学 2012-01-18 J. Rech , D. Chevallier , T. Jonckheere , T. Martin

The radiation generated by a quantum conductor should be correlated with electrons crossing it. We have measured the correlation between the fluctuations of the high frequency electromagnetic power and the low frequency transport in a…

介观与纳米尺度物理 · 物理学 2015-06-12 Julien Gabelli , Lafe Spietz , Jose Aumentado , Bertrand Reulet

In the presence of spatial variation of the magnetization direction, electric current noise causes a fluctuating spin-transfer torque that increases the fluctuations of the ferromagnetic order parameter. By the fluctuation-dissipation…

介观与纳米尺度物理 · 物理学 2009-11-13 Jorn Foros , Arne Brataas , Yaroslav Tserkovnyak , Gerrit E. W. Bauer

Coulomb screening, together with degeneracy, is characteristic of the metallic electron gas. While there is little trace of its effects in transport and noise in the bulk, at mesoscopic scales the electronic fluctuations start to show…

介观与纳米尺度物理 · 物理学 2009-10-31 Frederick Green , Mukunda P Das

The shot noise in tunneling experiments reflects the Poissonian nature of the tunneling process. The shot noise power is proportional to both the magnitude of the current and the effective charge of the carrier. Shot noise spectroscopy thus…

Current noise provides useful information on correlations important for transport properties of mesoscopic systems. Of particular interest, both experimentally and theoretically, are heterostructures of normal metals and superconductors. We…

超导电性 · 物理学 2017-08-23 W. Belzig , J. Boerlin , C. Bruder , Yu. V. Nazarov

We propose an extension of the Landauer-Buttiker scattering theory to include effects of interaction in the active region of a mesoscopic conductor structure. The current expression obtained coincides with those derived by different…

介观与纳米尺度物理 · 物理学 2009-11-13 V. Nam Do , P. Dollfus , V. L. Nguyen

We study charge transport through a chain of quantum dots. The dots are fully coherent among each other and weakly coupled to metallic electrodes via the dots at the interface, thus modelling a molecular wire. If the non-local Coulomb…

介观与纳米尺度物理 · 物理学 2009-11-11 J. Aghassi , A. Thielmann , M. H. Hettler , G. Schön

Due to the Fermi-Dirac statistics of electrons the temporal correlations of tunneling events in a double barrier setup are typically negative. Here, we investigate the shot noise behavior of a system of two capacitively coupled quantum dot…

介观与纳米尺度物理 · 物理学 2007-05-23 H. Sprekeler , G. Kiesslich , A. Wacker , E. Schoell

We show how to calculate the charge noise spectrum in a normal mesoscopic conductor, which is capacitively coupled to a macroscopic gate, when this conductor is attached to L normal leads and M superconducting leads, the only restriction…

介观与纳米尺度物理 · 物理学 2009-10-31 Andrew M. Martin , Thomas Gramespacher , Markus Buttiker

Recent measurements in current-driven spin valves demonstrate magnetization fluctuations that deviate from semiclassical predictions. We posit that the origin of this deviation is spin shot noise. On this basis, our theory predicts that…

介观与纳米尺度物理 · 物理学 2019-02-25 Alireza Qaiumzadeh , Arne Brataas

We discuss mesoscopic effects in quantum dots, nanoparticles and nuclei. In quantum dots, we focus on the statistical regime of dots whose single-electron dynamics are chaotic. Random matrix theory methods, developed to explain the…

介观与纳米尺度物理 · 物理学 2009-11-11 Y. Alhassid

The edge channels of two-dimensional topological systems are protected from elastic reflection and are noiseless at low temperature. Yet, noise and cross-correlations can be induced when electron waves partly transmit to the opposite edge…

介观与纳米尺度物理 · 物理学 2015-10-20 Fabrizio Dolcini

The frequency-dependent shot noise in long and narrow mesoscopic diffusive contacts is numerically calculated. The case of arbitrarily strong electron-electron scattering and zero temperature of electrodes is considered. For all voltages,…

介观与纳米尺度物理 · 物理学 2009-10-31 K. E. Nagaev