The interaction between exciton and confined longitudinal optical （LO） phonons, interface optical （IO） phonons in an asymmetric Ga1-xAlxAsIGaAslGao.TAlo.3As square quantum well is investigated. By applying the LLP...The interaction between exciton and confined longitudinal optical （LO） phonons, interface optical （IO） phonons in an asymmetric Ga1-xAlxAsIGaAslGao.TAlo.3As square quantum well is investigated. By applying the LLP-like transformation and variational approach, the numerical results are obtained as functions of the well width and asymmetric-degree of well. The exciton-optical phonons interaction-energy has a minimum value with the increase of the well width. It is demonstrated that the LO-phonon energy-contribution increases while the IO-phonon contribution decreases as the well width increases gradually. The energy-contribution of LO-phonon in symmetric and asymmetric square quantum well does not have too much difference, but the IO-phonon contribution varies apparently. The exciton binding-energy monotonically decreases with the increase of the well width and is proportional to the left-barrier height.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 10574011)
文摘The interaction between exciton and confined longitudinal optical （LO） phonons, interface optical （IO） phonons in an asymmetric Ga1-xAlxAsIGaAslGao.TAlo.3As square quantum well is investigated. By applying the LLP-like transformation and variational approach, the numerical results are obtained as functions of the well width and asymmetric-degree of well. The exciton-optical phonons interaction-energy has a minimum value with the increase of the well width. It is demonstrated that the LO-phonon energy-contribution increases while the IO-phonon contribution decreases as the well width increases gradually. The energy-contribution of LO-phonon in symmetric and asymmetric square quantum well does not have too much difference, but the IO-phonon contribution varies apparently. The exciton binding-energy monotonically decreases with the increase of the well width and is proportional to the left-barrier height.
