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Polaron effect on Raman scattering in semiconductor quantum dots
Vasilevskiy, Mikhail; Miranda, R. P.; Anda, Enrique; Makler, SergioStrong coupling of a confined exciton to optical phonons in semiconductor quantum dots (QDs) leading to the formation of a polaron is considered for a model system including two lowest exciton states and several optical phonon modes. Both intra- and inter-level terms are taken into account. The Hamiltonian has been exactly diagonalized including a finite number of phonons allowed for each mode, large enough to ...
Electron-phonon interaction effects in semiconductor quantum dots: a non-pertur...
Vasilevskiy, Mikhail; Anda, Enrique; Makler, SergioMultiphonon processes in a model quantum dot (QD) containing two electronic states and several optical phonon modes are considered by taking into account both intra- and nterlevel terms. The Hamiltonian is exactly diagonalized, including a finite number of multiphonon processes large enough to guarantee that the result can be considered exact in the physically important energy region. The physical properties a...
A quantum formalism for a terahertz acoustic laser
Camps Rodríguez,Ihosvany; Makler,Sergio Saul; Anda,Enrique VictorianoThe aim of this work is to improve the study of a phonon laser (saser) proposed by us several years ago[1]. This is a device capable to generate an intense coherent beam of acoustical phonons. Our acoustic laser consists in a double barrier heterostructure tailored such the energy difference between the ground and the first excited state in the well is close to the energy of the LO phonon. The electrons are dir...
A source of terahertz coherent phonons
Makler, Sergio; Vasilevskiy, Mikhail; Tuyarot, Diana; Weberszpil, José; Anda, Enrique; Pastawski, HoracioResonant tunnelling in a double-barrier heterostructure (DBHS) designed in order to produce an intense coherent emission of phonons is studied theoretically. Thisemission is achieved when the energy difference between the first excited level and the ground state in the well is close to the LO-phonon energy. The LO phonons emitted during the electron transition decay into a pair of (fLO and TA) phonons that leav...
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