Size quantization of acoustic phonons in CuCl nanocrystals

2019-11-02 01:59:47

quantum semiconductor nanocrystals DOTS phonons

责任者: Gupalov, S.V.;Merkulov, I.A. 单位: A.F. Ioffe Physicotech. Inst., Acad. of Sci., St. Petersburg, Russia 来源出处: JETP Letters(JETP Lett. (Russia)),2000//,72(2):49-51 摘要: It is shown that the mixed character of spheroidal vibrational modes of semiconductor quantum dots of spherical shape may lead to the appearance of a line in the low-frequency Raman spectra of nanocrystals whose spectral position is independent of the average radius of nanocrystals in the sample over a wide range of sizes. This effect is associated with the rapid saturation of the dispersion dependence for transversal acoustic phonons in the bulk semiconductor. The maximum radius of quantum dots at which the line indicated above is observed in the spectrum has been estimated 关键词: copper compounds;nanostructured materials;phonons;Raman spectra;semiconductor quantum dots;spheroidal vibrational modes;spherical semiconductor quantum dots;low-frequency Raman spectra;CuCl nanocrystals;size quantization;spectral position;rapid dispersion dependence saturation;transversal acoustic phonons;bulk semiconductor;CuCl