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Protons produced in electromagnetic showers formed by the reverse-electron flux are usually the largest component of the time-averaged polar-cap open magnetic flux-line current in neutron stars with positive corotational charge density.…

高能天体物理现象 · 物理学 2015-05-14 P B Jones

We predict that the flow of unpolarized current in electron-doped GaAs and InP at room temperature is unstable at high electric fields to the dynamic formation of spin-polarized current pulses. Spin-polarized current is spontaneously…

介观与纳米尺度物理 · 物理学 2007-05-23 Yunong Qi , Zhi-Gang Yu , Michael E. Flatté

Electrophoresis is the motion of particles relative to a surrounding fluid driven by a uniform electric field. In conventional electrophoresis, the electrophoretic velocity grows linearly with the applied field. Nonlinear effects with a…

软凝聚态物质 · 物理学 2024-03-19 Mojtaba Rajabi , Taras Turiv , Bing-Xiang Li , Hend Baza , Dmitry Golovaty , Oleg D. Lavrentovich

We have observed thermal gating, i.e. electrostatic gating induced by hot electrons. The effect occurs in a device consisting of two capacitively coupled quantum dots. The double dot system is coupled to a hot electron reservoir on one side…

We consider the adiabatic pumping of charge through a mesoscopic one dimensional wire in the presence of electron-electron interactions. A two-delta potential model is used to describe the wire, which allows to obtain exactly the scattering…

介观与纳米尺度物理 · 物理学 2009-11-13 Pierre Devillard , Vladimir Gasparian , Thierry Martin

Electrochemical energy systems rely on particulate porous electrodes to store or convert energies. While the three-dimensional porous structures were introduced to maximize the interfacial area for better overall performance of the system,…

应用物理 · 物理学 2021-02-16 Shubham Agrawal , Peng Bai

When two superconductors become electrically connected by a weak link a zero-resistance supercurrent can flow. This supercurrent is carried by Cooper pairs of electrons with a combined charge of twice the elementary charge, e. The 2e charge…

We consider spin-polarized transport in a quantum spin Hall antidot system coupled to normal leads. Due to the helical nature of the conducting edge states, the screening potential at the dot region becomes spin dependent without external…

介观与纳米尺度物理 · 物理学 2014-09-04 Sun-Yong Hwang , Rosa Lopez , Minchul Lee , David Sanchez

We derive the expressions of photon energy and particle currents inside an open nanosystem interacting with light using non-equilibrium Green's functions. The model allows different temperatures for the electron reservoirs, which basically…

介观与纳米尺度物理 · 物理学 2017-04-05 Fabienne Michelini , Adeline Crépieux , Katawoura Beltako

In traditional approaches of obtaining quantized acoustoelectric current, a narrow channel is fabricated to form quantum dots, which hold a fixed number of electrons at a certain depth. We propose a natural way of forming quantum dots…

介观与纳米尺度物理 · 物理学 2007-05-23 Xiang-Song Chen

Coulometric measurements on salt-water-immersed nanoporous carbon electrodes reveal, at a fixed voltage, a charge decrease with increasing temperature. During far-out-of-equilibrium charging of these electrodes, calorimetry indicates the…

化学物理 · 物理学 2017-10-25 Mathijs Janssen , Elian Griffioen , P. M. Biesheuvel , René van Roij , Ben Erné

The venerable theory of electrokinetic phenomena rests on the hypothesis of a dilute solution of point-like ions near a weakly charged surface, whose potential relative to the bulk is of order the thermal voltage ($kT/e \approx 25$ mV at…

流体动力学 · 物理学 2009-09-29 Martin Z. Bazant , Mustafa Sabri Kilic , Brian D. Storey , Armand Ajdari

A quantum pumping mechanism which produces dc current or voltage in response to a cyclic deformation of the confining potential in an open quantum dot is reported. The voltage produced at zero current bias is sinusoidal in the phase…

介观与纳米尺度物理 · 物理学 2009-10-31 M. Switkes , C. M. Marcus , K. Campman , A. C. Gossard

We developed the theory of elastic electron tunneling through a potential barrier driven by a strong high-frequency electromagnetic field. It is demonstrated that the driven barrier can be considered as a stationary two-barrier potential…

介观与纳米尺度物理 · 物理学 2023-11-13 M. V. Boev , V. M. Kovalev , O. V. Kibis

Nonequilibrium processes in semiconductors are considered with highly nonuniform initial densities of charge carriers. It is shown that there exist such distributions of charge densities under which the electric current through a sample…

凝聚态物理 · 物理学 2009-10-31 V. I. Yukalov , E. P. Yukalova , M. R. Singh

The phenomenon of electrowetting, i.e., the dependence of the macroscopic contact angle of a fluid on the electrostatic potential of the substrate, is analyzed in terms of the density functional theory of wetting. It is shown that…

软凝聚态物质 · 物理学 2014-05-07 Markus Bier , Ingrid Ibagon

Electroosmosis is a fascinating effect where liquid motion is induced by an applied electric field. Counter ions accumulate in the vicinity of charged surfaces, triggering a coupling between liquid mass transport and external electric…

Transport of Brownian particles interacting with each other via the Morse potential is investigated in the presence of an ac driving force applied locally at one end of the chain. By using numerical simulations, we find that the system can…

统计力学 · 物理学 2012-08-16 Bao-quan Ai , Ya-feng He , Wei-rong Zhong

We report experimentally that the electricity is generated from ambient thermal fluctuations across a non-ideal diode consisted of a silicon tip and an aluminum surface. The output is tuned by the contact force which modulates Schottky…

介观与纳米尺度物理 · 物理学 2014-06-19 Guoan Tai , Jinsong Liu , Tian Zeng , Jizhou Kong , Fuyong Lv

Theoretical foundations of electron transport in mesoscopic systems, based on Landauer theory, Master equations or Onsager linear thermodynamics, are revisited to show that the noniteracting electrons model is insufficient to describe…

介观与纳米尺度物理 · 物理学 2025-07-29 Robert Alicki