Semiconductor quantum dots electron-phonon

A QD Hamiltonian includes both Coulomb and electron-phonon interactions. Apparently, the phonon modes (denoted as QD) in the quantum dot are different from the semiconductor ones. The electron-phonon interaction determines relaxation processes in quantum dot (hot electrons or excitons). Thus, the QD Hamiltonian yields... 

M. A. Stroscio and M. Dutta, Biologically-inspired chemically-directed self-assembly of semiconductor quantum-dot-based systems Phonon-hole scattering in DNA bound to DNA-quantum-dot complexes, IntemationalJoumal of High Speed Electronics, in press, 2006. 

Electron-phonon interaction in a semiconductor is the main factor for relaxation of a transferred electron. There are two different relaxation processes that decrease the efficiency of light conversion in a solar system (1) relaxation of an electron from a semiconductor conduction band to a valence band and (2) a backward electron transfer reaction. The forward and backward electron transfer processes have been already included in the tunneling interaction, HSm-qd, described by Eq. (108). However, the effect of SM e-ph interaction is important for the correct description of electron transfer in the SM-QD solar cell system. In the previous section, we have gradually considered different types of interactions in the quantum dot and obtained the exact expression for the photocurrent (128) where the exact nonequilibrium QD Green s functions determined from Eq. (127) have been used. However, in... 

While the electronic and optical properties of semiconductor NCs are well luiderstood, the vibrational properties (phonons confined in spherical quantum dots of several nanometers in size) of NCs received much less attention until the last few years [1-4]. An accurate description of the vibrational modes of a NC is of fundamental interest and is required to understand the coupling of vibrational modes to electronic charge. Recently, it has been shown theoretically that geometrical confinement becomes important both for infrared and Raman-active phonons in the limit of a small size of QDs [5]. In this paper, we report the observation of coupled phonon modes in ZnSe spherical quantum dots. 

YN Hwang, SH Park, D Kim. Size-dependent surface phonon mode of CdSe quantum dots. Size dependence of electron-phonon coupling in semiconductor nanospheres—The case of CdSe. Phys Rev B 59 7285-7288, 1999. 

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