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        Nonequilibrium electron leakage in terahertz quantum cascade structures

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        Author
        Freeman, Will
        Karunasiri, Gamani
        Date
        2012
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        Abstract
        The nonequilibrium absorption of longitudinal-optical phonons by hot electrons are suited in terahertz quantum cascade structures. We present a method for including electron leakage to the continuum that take into account the mobility of the electrons. This is incorporated into a density matrix Monte Carlo method that includes to optical field within the resonant cavity. The effects of electron leakage to the continuum as a function of lattice temperature are discussed. Results are compared with the experiment and found to be consistent. It is shown that using only confined wave function and thereby neglecting the leakage via tunneling is inadequate for describing the electron transport.
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        The article of record as published may be found at http://dx.doi.org/10.1103/PhysRevB.85.195326
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        http://hdl.handle.net/10945/47509
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