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arXiv:quant-ph/9908025 · Physics Letters A

Physical interpretation of laser-induced suppression of quantum tunneling

Emmanuel Paspalakis

Published Oct 1, 1999• 10 citations
arXivHTMLPDF
DOI
10.1016/s0375-9601(99)00630-1

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We revisit the problem of laser-induced suppression of quantum dynamical tunneling in a model system studied by Kilin et al. [Phys. Rev. Lett. 76 (1996) 3297]. This quantum system consists of a ground state symmetric double-well potential which is coupled by a strong laser field to an excited state asymmetric double-well potential. By analyzing the assumptions used in their analysis we show that the suppression of quantum dynamical tunneling can be explained with the use of dark and bright states of the system. We also generalize the system and the conditions for suppression of quantum tunneling and show that, in certain cases, suppression can occur regardless the characteristics of the excited potential surface.
The suppression of Quantum Dynamical tunneling is predicted to occur when a laser field drives a transition in an isolated,single molecule embedded in a host medium.A externalforce having quasiresont frequency drives trasitions between the ground and excited states,which forms a Λ-type systerm.Through dressed state analysis,dark and bright representation analysis and some approximation,the solution is gained.Dark and bright representation analysis is a physical interpretation;in some condition,particles can be completely localized in one well or be localized in lower doublet.
The optical bistability of a triangular quantum dot molecules embedded inside a unidirectional ring cavity is studied. The type, the threshold and the hysteresis loop of the optical bistability curves can be modified by the tunneling parameters, as well as the probe laser field. The linear and nonlinear susceptibilities of the medium are also studied to interpret the corresponding results. The physical interpretation is that the tunneling can induce the quantum interference, which modifies the linear and the nonlinear response of the medium. As a consequence, the characteristics of the optical bistability are changed. The scheme proposed here can be utilized for optimizing and controlling the optical switching process.