The Experts below are selected from a list of 104658 Experts worldwide ranked by ideXlab platform
Wei-min Zhang - One of the best experts on this subject based on the ideXlab platform.
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Master equation approach to transient Quantum Transport in nanostructures
Frontiers of Physics, 2016Co-Authors: Pei Yun Yang, Wei-min ZhangAbstract:In this review article, we present a non-equilibrium Quantum Transport theory for transient electron dynamics in nanodevices based on exact Master equation derived with the path integral method in the fermion coherent-state representation. Applying the exact Master equation to nanodevices, we also establish the connection of the reduced density matrix and the transient Quantum Transport current with the Keldysh nonequilibrium Green functions. The theory enables us to study transient Quantum Transport in nanostructures with back-reaction effects from the contacts, with non-Markovian dissipation and decoherence being fully taken into account. In applications, we utilize the theory to specific Quantum Transport systems, a variety of Quantum decoherence and Quantum Transport phenomena involving the non-Markovian memory effect are investigated in both transient and stationary scenarios at arbitrary initial temperatures of the contacts.
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Quantum Transport Theory for Photonic Networks
arXiv: Quantum Physics, 2010Co-Authors: Chan U Lei, Wei-min ZhangAbstract:In this paper, we develop a Quantum Transport theory to describe photonic Transport in photonic networks. The photonic networks concerned in the paper consist of all-optical circuits incorporating photonic bandgap waveguides and driven resonators. The photonic Transport flowing through waveguides are entirely determined from the exact master equation of the driven resonators. The master equation of the driven resonators is obtained by explicitly eliminating all the waveguide degrees of freedom while the back-reactions between resonators and waveguides are fully taken into account. The relations between the driven photonic dynamics and photocurrents are obtained. The non-Markovian memory structure and Quantum coherence and decoherence effects in photonic Transport are also fully included. This Quantum Transport theory unifies two fundamental nonequilibrium approaches, the Keldysh's nonequilibrium Green function technique and the Feynman-Vernon influence functional approach, together to make the investigation of the transient Quantum photonic Transport become more powerful. As an illustration, the theory is applied to the Transport phenomena of a driven nanocavity coupled to two waveguides in photonic crystals. The controllability of photonic Transport through the driven resonator is demonstrated.
Michael Hochberg - One of the best experts on this subject based on the ideXlab platform.
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Quantum Transport simulations in a programmable nanophotonic processor
Nature Photonics, 2017Co-Authors: Nicholas C. Harris, Gregory R. Steinbrecher, Mihika Prabhu, Yoav Lahini, Jacob Mower, Darius Bunandar, Changchen Chen, Franco N. C. Wong, Tom Baehr-jones, Michael HochbergAbstract:Environmental noise and disorder play critical roles in Quantum particle and wave Transport in complex media, including solid-state and biological systems. While separately both effects are known to reduce Transport, recent work predicts that in a limited region of parameter space, noise-induced dephasing can counteract localization effects, leading to enhanced Quantum Transport. Photonic integrated circuits are promising platforms for studying such effects, with a central goal of developing large systems providing low-loss, high-fidelity control over all parameters of the Transport problem. Here, we fully map the role of disorder in Quantum Transport using a nanophotonic processor: a mesh of 88 generalized beamsplitters programmable on microsecond timescales. Over 64,400 experiments we observe distinct Transport regimes, including environment-assisted Quantum Transport and the ‘Quantum Goldilocks’ regime in statically disordered discrete-time systems. Low-loss and high-fidelity programmable transformations make this nanophotonic processor a promising platform for many-boson Quantum simulation experiments. A large-scale, low-loss and phase-stable programmable nanophotonic processor is fabricated to explore Quantum Transport phenomena. The signature of environment-assisted Quantum Transport in discrete-time systems is observed for the first time.
Johann Rafelski - One of the best experts on this subject based on the ideXlab platform.
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Relativistic Quantum Transport theory
Bulletin of the American Physical Society, 1993Co-Authors: G.r. Shin, Johann RafelskiAbstract:We study the single-time Quantum Transport equation which was suggested by Bialynicki-Birula, Gornicki and Rafelski, for the simple geometry of two parallel plates. The solutions show the particle productions and the flow of the produced particles. We consider the possible application of this crude model to the heavy-ion collision.
Massimiliano Di Ventra - One of the best experts on this subject based on the ideXlab platform.
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Quantum Transport in ultracold atoms
Nature Physics, 2015Co-Authors: Chih-chun Chien, Sebastiano Peotta, Massimiliano Di VentraAbstract:Ultracold atoms confined by engineered magnetic or optical potentials are ideal to study phenomena otherwise difficult to realize or probe in the solid state, thanks to the ability to control the atomic interaction strength, number of species, density and geometry. Here, we review Quantum Transport phenomena in atomic gases that mirror and can either better elucidate or show fundamental differences with respect to those observed in mesoscopic and nanoscopic systems. We discuss the significant progress in Transport experiments in atomic gases, the similarities and differences between Transport in cold atoms and in condensed matter systems, and survey theoretical predictions that are difficult to verify in conventional set-ups. Ultracold-atom experiments enable more flexibility in the study of Quantum Transport phenomena that are otherwise difficult to probe in solid-state systems. A survey of recent advances highlights the challenges and opportunities of this approach.
Nicholas C. Harris - One of the best experts on this subject based on the ideXlab platform.
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Quantum Transport simulations in a programmable nanophotonic processor
Nature Photonics, 2017Co-Authors: Nicholas C. Harris, Gregory R. Steinbrecher, Mihika Prabhu, Yoav Lahini, Jacob Mower, Darius Bunandar, Changchen Chen, Franco N. C. Wong, Tom Baehr-jones, Michael HochbergAbstract:Environmental noise and disorder play critical roles in Quantum particle and wave Transport in complex media, including solid-state and biological systems. While separately both effects are known to reduce Transport, recent work predicts that in a limited region of parameter space, noise-induced dephasing can counteract localization effects, leading to enhanced Quantum Transport. Photonic integrated circuits are promising platforms for studying such effects, with a central goal of developing large systems providing low-loss, high-fidelity control over all parameters of the Transport problem. Here, we fully map the role of disorder in Quantum Transport using a nanophotonic processor: a mesh of 88 generalized beamsplitters programmable on microsecond timescales. Over 64,400 experiments we observe distinct Transport regimes, including environment-assisted Quantum Transport and the ‘Quantum Goldilocks’ regime in statically disordered discrete-time systems. Low-loss and high-fidelity programmable transformations make this nanophotonic processor a promising platform for many-boson Quantum simulation experiments. A large-scale, low-loss and phase-stable programmable nanophotonic processor is fabricated to explore Quantum Transport phenomena. The signature of environment-assisted Quantum Transport in discrete-time systems is observed for the first time.
