Nonresonant two-photon generation of excitonic matter in a CuCl pellet |
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| Authors: | J.I. Jang J.B. Ketterson R.P.H. Chang |
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| Affiliation: | a Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
b Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive Evanston, IL 60208, USA |
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| Abstract: | A pressed CuCl pellet is optically excited at 2 K using an excitation energy in the range from 1892 to 2843 meV, which is far below the bandgap. The steady-state population dynamics unambiguously indicates an unusual two-photon generation of ground-state excitons. At high-excitation levels, the observed spectra exhibit rich spectral features arising from electron-hole plasma and electron-hole droplets formation. This nonresonant two-photon excitation is presumably assisted by impurity bands due to grain boundaries and surfaces in this random semiconductor. |
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| Keywords: | 71.35.&minus y 78.55.&minus m |
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