Temperature dependence of excitonic energy in isolated Se chains formed in the channels of AlPO4-5 crystals
Tang, Z. K.
Zhao, W. M.
Wong, G. K.
Date of Issue1997
School of Physical and Mathematical Sciences
Optical absorption spectra of Se chains formed in channels of AlPO4-5 (AFI) crystals are measured in the temperature range from 80 to 298 K. The excitonic energy of the isolated Se chains is observed to shift to lower energy linearly with increasing temperatures, in sharp contrast to the positive temperature coefficient in trigonal-Se crystal. The marked change in the temperature behavior of the excitonic energy is attributed to the greatly diminished interchain interaction in Se–AFI as well as the weakening of the electron-optical-phonon coupling in a low-dimensional system.
DRNTU::Science::Physics::Optics and light
Applied Physics Letters
Applied Physics Letters © copyright 1997 American Institute of Physics. The journal's website is located at http://apl.aip.org/.