Self-trapped electrons and holes in PbBr$_2$ crystals

Details Self-trapped electrons and holes in PbBr$_2$ crystals Self-trapped electrons and holes in PbBr$_2$ crystals

2002-01-16

arxiv.org/abs/cond-mat/0201264v2

Phys. Rev. B 65, 214306 (2002).

Physics

Condensed Matter

Materials Science

8 pages (7 figures, 2 tables), ReVTEX; revised the text and figures 1, 4, and 5

Scientific paper

10.1103/PhysRevB.65.214306

We have directly observed self-trapped electrons and holes in PbBr$_{2}$ crystals with electron-spin-resonance (ESR) technique. The self-trapped states are induced below 8 K by two-photon interband excitation with pulsed 120-fs-width laser light at 3.10 eV. Spin-Hamiltonian analyses of the ESR signals have revealed that the self-trapping electron centers are the dimer molecules of Pb$_2$$^{3+}$ along the crystallographic a axis and the self-trapping hole centers are those of Br$_2$$^-$ with two possible configurations in the unit cell of the crystal. Thermal stability of the self-trapped electrons and holes suggests that both of them are related to the blue-green luminescence band at 2.55 eV coming from recombination of spatially separated electron-hole pairs.

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