Quantum Diffusion

  • Sushanta Dattagupta
  • Sanjay Puri
Part of the Springer Series in Materials Science book series (SSMATERIALS, volume 71)


Our discussion of dissipative phenomena has been based on two distinct examples of stochastic processes, viz., the discrete jump process and the continuous diffusion process. From a microscopic perspective, the jump process is modeled in terms of a single magnetic spin in contact with a heat bath (see Chap. 1). This model is generalizable to the case of an interacting many-body system, described by an Ising model (see Chap. 2). In Chaps. 3–6, we discussed various examples of phase ordering systems, which are described by generalizations of kinetic Ising models and their coarse-grained counterparts. In Chap. 7, we encountered a natural extension of the jump process to the quantum domain, i.e., the spin-boson model, where a single spin is subjected to mutually perpendicular magnetic fields in order to generate non-commuting quantum dynamics. Additionally, the bath is taken to be quantum-mechanical in Chap. 8, and is described by non-interacting bosons.


Landau Level Langevin Equation Heat Bath Jump Process Quantum Harmonic Oscillator 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2004

Authors and Affiliations

  • Sushanta Dattagupta
    • 1
  • Sanjay Puri
    • 2
  1. 1.S.N. Bose National Centre for Basic SciencesSalt Lake KolkataIndia
  2. 2.School of Physical SciencesJawaharlal Nehru UniversityNew DelhiIndia

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