ABSORPTION-SPECTRA OF SE AND HGI2, CHAINS IN CHANNELS OF ALPO4-5 SINGLE-CRYSTAL

The absorption spectra are reported for isolated Se and HgI2 semicondu ctor chains accommodated in AlPO4-5 (AFI) channels of diameter 7.3 Ang strom. The lowest electronic excitation states of the isolated chains are shifted to higher energy from the band edge transitions of their b ulk crystals. The blue shifts are qualitatively explained by the quant um confinement effects of carriers in a one-dimensional wire. The expe rimental result of the Se/AFI is in good agreement with the theoretica l expectation based on the effective-mass-approximation. The result of the HgI2/AFI, however, does not agree with the calculation. The diffe rent behaviors of the Se/AFI and the HgI2/AFI are expected to result f rom their different electronic structures. (C) 1997 American Institute of Physics.