Two-dimensional tunnel correlations with dissipation

Details Two-dimensional tunnel correlations with dissipation Two-dimensional tunnel correlations with dissipation

2002-12-28

arxiv.org/abs/cond-mat/0212623v2

Phys. Rev. B 68, 155426 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX4, twocolumn, 12 pages, 11 figures (17 eps-files). Revised version, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.68.155426

Tunneling of two particles in synchronous and asynchronous regimes is studied in the framework of dissipative quantum tunneling. The critical temperature T_c corresponding to a bifurcation of the underbarrier trajectory is determined. The effect of a heat bath local mode on the probability of two-dimensional tunneling transfer is also investigated. At certain values of the parameters, the degeneracy of antiparallel tunneling trajectories is important. Thus, four, six, twelve, etc., pairs of the trajectories should be taken into account (a cascade of bifurcations). For the parallel particle tunneling the bifurcation resembles phase transition of a first kind, while for the antiparallel transfer it behaves as second order phase transition. The proposed theory allows for the explanation of experimental data on quantum fluctuations in two-proton tunneling in porphyrins near the critical temperature.

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