skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Emergence of currents as a transient quantum effect in nonequilibrium systems

Abstract

Most current calculations are based on equilibrium or semi-equilibrium models. However, except for very special scenarios (like ring configuration), the current cannot exist in equilibrium. Moreover, unlike with equilibrium scenarios, there is no generic approach to confront out-of-equilibrium currents. In this paper we used recent studies on transient quantum mechanics to solve the current, which appears in the presence of very high density gradients and fast transients. It shows that the emerging current appears instantaneously, and although the density beyond the discontinuity is initially negligible the currents there have a finite value, and remain constant for a finite period. It is shown that this nonequilibrium effect can be measured in real experiments (such as cooled rubidium atoms), where the discontinuity is replaced with a finite width (hundreds of nanometers) gradient.

Authors:
;  [1]
  1. Department of Electrical and Electronics Engineering, Ariel University Center of Samaria, Ariel (Israel)
Publication Date:
OSTI Identifier:
22068632
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: (c) 2011 American Institute of Physics; Country of input: Syrian Arab Republic; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; ATOMS; CURRENTS; DENSITY; EQUILIBRIUM; QUANTUM MECHANICS; RUBIDIUM; TRANSIENTS

Citation Formats

Granot, Er'el, and Marchewka, Avi. Emergence of currents as a transient quantum effect in nonequilibrium systems. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.032110.
Granot, Er'el, & Marchewka, Avi. Emergence of currents as a transient quantum effect in nonequilibrium systems. United States. doi:10.1103/PHYSREVA.84.032110.
Granot, Er'el, and Marchewka, Avi. Thu . "Emergence of currents as a transient quantum effect in nonequilibrium systems". United States. doi:10.1103/PHYSREVA.84.032110.
@article{osti_22068632,
title = {Emergence of currents as a transient quantum effect in nonequilibrium systems},
author = {Granot, Er'el and Marchewka, Avi},
abstractNote = {Most current calculations are based on equilibrium or semi-equilibrium models. However, except for very special scenarios (like ring configuration), the current cannot exist in equilibrium. Moreover, unlike with equilibrium scenarios, there is no generic approach to confront out-of-equilibrium currents. In this paper we used recent studies on transient quantum mechanics to solve the current, which appears in the presence of very high density gradients and fast transients. It shows that the emerging current appears instantaneously, and although the density beyond the discontinuity is initially negligible the currents there have a finite value, and remain constant for a finite period. It is shown that this nonequilibrium effect can be measured in real experiments (such as cooled rubidium atoms), where the discontinuity is replaced with a finite width (hundreds of nanometers) gradient.},
doi = {10.1103/PHYSREVA.84.032110},
journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 84,
place = {United States},
year = {2011},
month = {9}
}