Photoluminescence and electric conductivity in germanium at low temperatures

Schneider, Harald; Metzger, Wyatt K.; Nöldeke, Ch.; Huebener, R. P.

doi:10.1007/bf01307764

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…Therefore, we simply assume that the deformation potential is given by , where k is the magnitude of k. Carrying out the calculation with the extra factor of k in Eq. (22), we arrive at (34) The definite integral in Eq. ( 34) can also be calculated exactly for .…”

Section: Expandingmentioning

confidence: 99%

“…Adding the neglected imaginary part to the integrals in Eq. ( 27), (31), and (34) requires that they be computed numerically. If we proceed this way, however, we find that the magnitude of the absorption at depends strongly on the broadening parameter.…”

Section: Broadeningmentioning

confidence: 99%

“…In this paper, we present a combined experimental and theoretical study of PL in Ge. Our emphasis is not on extremely low temperatures, for which many PL studies are available [30][31][32][33][34], but on the intermediate range between cryogenic and room temperature, which provides the best test of theoretical predictions based on Eq. (1).…”

Section: Introductionmentioning

confidence: 99%

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Temperature-dependent photoluminescence in Ge: Experiment and theory

2020

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We report a photoluminescence study of high-quality Ge samples at temperatures 12 K ≤ T ≤ 295 K, over a spectral range that covers phonon-assisted emission from the indirect gap (between the lowest conduction band at the L point of the Brillouin zone and the top of the valence band at the Γ point), as well as direct gap emission (from the local minimum of the conduction band at the Γ point). The spectra display a rich structure with a rapidly changing lineshape as a function of T. A theory is developed to account for the experimental results using analytical expressions for the contributions from LA, TO, LO, and TA phonons. Coupling of states exactly at the Γ and L points is forbidden by symmetry for the latter two phonon modes, but becomes allowed for nearby states and can be accounted for using wave-vector dependent deformation potentials. Excellent agreement is obtained between predicted and observed photoluminescence lineshapes. A decomposition of the predicted signal in terms of the different phonon contributions implies that near room temperature indirect optical absorption and emission are dominated by "forbidden" processes, and the deformation potentials for allowed processes are smaller than previously assumed.

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Section: Expandingmentioning

confidence: 99%

Section: Broadeningmentioning

confidence: 99%