Steady-state phonon-free current in superlattices in a strong electric field induced by terahertz radiation |
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Authors: | V V Bryksin P Kleinert |
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Institution: | 1. Ioffe Physicotechnical Institute, Russian Academy of Sciences, ul. Politekhnicheskaya 26, St. Petersburg, 194021, Russia 2. Paul-Drude-Institut für Festk?rperelektronik, 10117, Berlin, Germany
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Abstract: | The effect of strong terahertz radiation on the current-voltage characteristics in one-dimensional superlattices is studied using the method of two-time nonequilibrium Green’s functions. It is shown that the broadening of discrete spectrum lines due to elastic scattering plays a fundamental role in this problem. A new phonon-free type of photon-induced charge transfer in the hopping mode is predicted. Under certain conditions, the constant components of current and electric field may have opposite directions in this regime. The phonon-free current cannot be described in principle in the formalism of the one-time density matrix and reflects the two-time nature of correlation functions. |
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