Pramana

, Volume 35, Issue 6, pp 579–591 | Cite as

Relaxation behaviour of a biased two-level system, in metals in the weak damping limit

  • Tabish Qureshi
  • Sushanta Dattagupta
Article

Abstract

The dynamic properties of a biased two-level system in contact with a dissipative bath are studied in the weak coupling limit using a resolvent expansion method. The theory yields consistent results at low temperatures, a regime in which the widely used dilute bounce gas approximation (DBGA) to an underlying functional integral expression breaks down. The present results are however equivalent to a recently adapted functional integral technique that goes beyond the DBGA. The calculated expressions are relevant for analyzing the neutron scattering data on tunneling of light interstitials, e.g., hydrogen, in metals, at very low temperatures.

Keywords

Quantum dissipation diffusion in metals tunneling biased two-level systems relaxation phenomena neutron scattering 

PACS Nos

67.40 05.30 66.30 

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Copyright information

© the Indian Academy of Sciences 1990

Authors and Affiliations

  • Tabish Qureshi
    • 1
  • Sushanta Dattagupta
    • 1
  1. 1.School of Physical SciencesJawaharlal Nehru UniversityNew DelhiIndia

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