Unbounded -spectrum from quantum fluctuations of the Coulomb potential at finite temperature

2008 ◽  
Vol 372 (6) ◽  
pp. 749-755 ◽  
Author(s):  
Kirill A. Kazakov
Keyword(s):  
Coulomb Potential ◽  
Finite Temperature ◽  
Quantum Fluctuations

Finite-Temperature Effects in Bose-Einstein Condensates

2000 ◽  
Vol 14 (supp01) ◽  
pp. 117-151
Author(s):  
Keith Burnett
Keyword(s):  
Finite Temperature ◽  
Temperature Effects ◽  
Quantum Fluctuations ◽  
Bose Einstein

In this article we discuss aspects of fluctuations and correlations that arise in the theory of trapped condensates at finite temperature. This requires us to look at both thermal and quantum fluctuations in the field that describes the condensates. We discuss ways in which these effects can be observed in experiments.

EVOLUTION OF QUANTUM FLUCTUATIONS OF A OVER-DAMPED MESOSCOPIC CIRCUIT AT FINITE TEMPERATURE

2007 ◽  
Vol 21 (31) ◽  
pp. 5275-5282
Author(s):  
JU-JU HU ◽  
QIANG KE ◽  
YING-HUA JI
Keyword(s):  
Quantum Information ◽  
Characteristic Function ◽  
Integrated Circuits ◽  
Time Evolution ◽  
Finite Temperature ◽  
Quantum Fluctuations ◽  
Squeezed State ◽  
Hyperbolic Functions ◽  
Amplitude Parameter

Time evolution of quantum fluctuations is investigated for an over-damped mesoscopic circuit with the help of the quantum characteristic function. It is found that, for an initial squeezed state, the quantum fluctuations of charge and current evolve with time by hyperbolic functions, and relate not only with the circuit parameters, but also the squeezing parameter. It is also found that with other conditions invariant to reducing the quantum fluctuations of charge and current, we should reduce the squeezing amplitude parameter. The research will be helpful in miniaturizing integrated circuits and electric components. It will also be significant for the further study of quantum information.

scholarly journals Coherence and Disorder in Bilayer Quantum Hall Systems

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
H. A. Fertig ◽  
Ganpathy Murthy
Keyword(s):  
Thin Film ◽  
Finite Temperature ◽  
Filling Factor ◽  
Quantum Hall ◽  
Quantum Fluctuations ◽  
Low Energy ◽  
Quantum Hall Systems ◽  
Low Dissipation ◽  
Bilayer Quantum Hall

The quantum Hall bilayer at total filling factor displays a number of properties akin to superfluidity, most clearly apparent in its very low dissipation in tunneling and counterflow transport. Theoretical descriptions in terms of quantum Hall ferromagnetism or thin-film superfluidity can be developed to explain these phenomena. In either case, merons can be identified as important low energy excitations. We demonstrate that a model in which puddles of merons induced by disorder, separated by narrow regions of interlayer coherence—a coherence network—can naturally explain many of the imperfect superfluid finite temperature properties that are observed in these systems. The periodic realization of this model shows that there can be low energy excitations beyond the superfluid mode. These are associated with transitions between states of different meron number in the puddles, where we argue that merons should be unbound atanytemperature, and which can have important implications for the effect of quantum fluctuations on the system.

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