Jingbo Li et al 2001 J. Phys.: Condens. Matter 13 2033 doi:10.1088/0953-8984/13/9/327
Jingbo Li1, Guo-Hua Li1, Jian-Bai Xia1, Jing-bo Zhang2, Yuan Lin2 and Xu-rui Xiao2
Show affiliationsOptical spectra of CdSe nanocrystals are measured at room temperature under pressure ranging from 0 to 5.2 GPa. The exciton energies shift linearly with pressure below 5.2 GPa. The pressure coefficient is 27 meV GPa-1 for small CdSe nanocrystals with the radius of 2.4 nm. With the approximation of a rigid-atomic pseudopotential, the pressure coefficients of the energy band are calculated. By using the hole effective-mass Hamiltonian for the semiconductors with wurtzite structure under various pressures, we study the exciton states and optical spectra for CdSe nanocrystals under hydrostatic pressure in detail. The intrinsic asymmetry of the hexagonal lattice structure and the effect of spin-orbit coupling on the hole states are investigated. The Coulomb interaction of the exciton states is also taken into account. It is found that the theoretical results are in good agreement with the experimental values.
78.67.Bf Nanocrystals and nanoparticles
71.20.Nr Semiconductor compounds
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
71.35.Cc Intrinsic properties of excitons; optical absorption spectra
Condensed matter: electrical, magnetic and optical
Issue 9 (5 March 2001)
Received 7 September 2000
Jingbo Li et al 2001 J. Phys.: Condens. Matter 13 2033
Evelyne Roueff and Eric Herbst 2009 J. Phys.: Conf. Ser. 192 012008
Soon Wan Chung et al 2006 Smart Mater. Struct. 15 213
F Jiménez-Villacorta et al 2009 J. Phys.: Conf. Ser. 190 012115
Matthew Newville et al 2009 J. Phys.: Conf. Ser. 190 012023
Gary Williams 2008 Phys. Educ. 43 134
G. Caimi et al 2006 Europhys. Lett. 75 496
Yi Wang 2009 Nonlinearity 22 765
Tonatiuh Matos et al 2000 Class. Quantum Grav. 17 1707
J R Verkouteren et al 2008 Meas. Sci. Technol. 19 115101