Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Functional analytic methods  (1)
  • Josephson tunneling  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 123-139 
    ISSN: 0392-6737
    Keywords: Heat capacities of liquids ; Functional analytic methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presentano i risultati di una formulazione basata sugli integrali di cammino applicata alla termodinamica di un sistema a due stati accoppiato agli elettroni di conduzione. Si mostra che l'usuale approssimazione di un gas diluito di «bounce» è inadeguata nel caso di debole smorzamento e basse temperature e si presenta pertanto un'appropriata generalizzazione. Il modo di valutare esattamente la funzione di partizione di un sistema a due stati debolmente smorzato è quello di generalizzare un singolo «bounce» a una classe di insiemi irriducibili di «bounce» multipli con interazioni interne e di considerare questi insiemi come un gas diluito. Si ricavano le espressioni per la funzione di partizione e per il calore specifico. Si discute anche il caso di un sistema a due stati in presenza di moderata asimmetria.
    Abstract: Резюме Приводятся результаты применения метода интегрирования по траекториям к термодинамике системы с двумя состояниями, связанной с электронами проводимости. Показывается, что стандартное приближение разжиженного газа не является адекватным для слабого затухания и при низких температурах. Предлагается соотаетствующее обобщение. Для выписления функции распределения для слабо затухающей системы с двумя состояниями необходимо обобщение рассматриваемого приближения для класса неприводимых кластеров с внутренними взвимодействиями, в затем рассматривать эти кластеры, как разжиженный газ. Приводятся количественные выражения для функции распределения и для удельной теплоёмкости. Так же обсуждается случай смещения.
    Notes: Summary The results of a path integral approach to the thermodynamics of a two-state system coupled to conduction electrons are presented. It is shown that the standard dilute bounce gas approximation is inadequate for weak damping and low temperatures and the appropriate generalization is presented. The strategy to evaluate exactly the partition function of a weakly damped two-state system is to generalize a single bounce to a class of irreducible multibounce clusters with internal interactions and to consider these clusters as a dilute gas. Quantitative expressions for the partition function and for the specific heat are presented. The case of a bias is also discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of superconductivity 12 (1999), S. 783-787 
    ISSN: 1572-9605
    Keywords: Josephson tunneling ; mesoscopic systems ; quantum dissipative systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We study exact self-duality in the model of a Brownian particle in a washboard (WB) potential which describes a Josephson junction (JJ) coupled to an environment, for arbitrary temperature and arbitrary form of the spectral density of the environment. To this end we introduce the quantum dissipative Villain model (QDVM), which models tunneling of a degree of freedom coupled to a linear quantum environment through an infinite set of states. We derive general exact mappings on various dual discrete representations (one-dimensional Coulomb gases or surface-roughening models) which are exactly self-dual. Then we show how the QDVM maps exactly onto the WB model and use duality relations to calculate the leading terms of the total impedance of a JJ circuit, for general frequency dependence of the spectral density of the environment and arbitrary temperature.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...