We present a semiclassical study of a transport process, the tunneling, in the presence of a magnetic field and a dissipative environment. We have found that the problem can be mapped onto an effective one-dimensional one, and the tunneling rate is strongly affected by the magnetic field, such as a complete suppression by a large parallel magnetic field, an example of the dynamical localization...

We develop the semiclassical method of complex trajectories in application to chaotic dynamical tunneling. First, we suggest a systematic numerical technique for obtaining complex tunneling trajectories by the gradual deformation of the classical ones. This provides a natural classification of the tunneling solutions. Second, we present a heuristic procedure for sorting out the least suppressed...

We formulate a procedure to obtain gauge-invariant tunneling rate at zero temperature using the recently developed potential approach. This relies on consistent power counting in gauge coupling and derivative expansion. The approach, while numerically more efficient than standard bounce solution method, inherits gauge-dependence of latter when naively implemented. Using Abelian Higgs model, we ...

We investigate quantum Brownian motion in adiabatically rocked ratchet systems. Above a crossover temperature Tc tunneling events are rare, yet they already substantially enhance the classical particle current. Below Tc, quantum tunneling prevails and the classical predictions grossly underestimate the transport. Upon approaching T ­ 0 the quantum current exhibits a tunneling induced reversal, ...

Applying Parikh’s semi-classical tunneling method, we consider Hawking radiation of the charged massive particles as a tunneling process from the Reissner-Nordströmde Sitter black hole with a global monopole. The result shows that the tunneling rate is related to the change of Bekenstein-Hawking entropy and the radiant spectrum is not a pure thermal one, but is consistent with an underlying uni...

This paper gives a comprehensive overview of the stateof-the-art in rewall and tunneling technologies. We describe the major rewall components and several approaches for legitimate and illegitimate tunneling techniques and investigate their interrelations. Finally we shortly introduce a highly adaptable tunneling application, having the potential to circumvent virtually every rewall system.

Articles you may be interested in Quantum and dynamical effects of proton donor-acceptor vibrational motion in nonadiabatic proton-coupled electron transfer reactions Predictions of rate constants and estimates for tunneling splittings of concerted proton transfer in small cyclic water clusters Tunneling currents in long-distance electron transfer reactions. IV. Many-electron formulation. Nonor...

the kinetics and mechanism of the reaction of 5-nitro-1h-benzo[d] imidazole to produce 6-nitro-1h-benzo[d] imidazole was studied by employing hybrid meta-density functional theory. mpwblk/6-31+g** level calculations were carried out to obtain energies and optimize the geometries of all stationary points along the pes, and determine the harmonic vibrational frequencies. two transition states (ts...

We investigate the quantum tunneling of Bose-Einstein condensates in optical lattices under gravity in the "Wannier-Stark localization" regime and "Landau-Zener tunneling" regime. Our results agree with experimental data [B. P. Anderson et al., Science 282, 1686 (1998); F. S. Cataliotti et al., Science 293, 843 (2001)]. We obtain the total decay rate which is valid over the entire range of temp...