Coulomb-Renormalized Intraband Dynamics Probed by THz Emission

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Wolter, F. ; Haring Bolivar, P. ; Bartels, G. ; Roskos, H. G. ; Kurz, H. ; Axt, Vollrath Martin ; Köhler, K.:
Coulomb-Renormalized Intraband Dynamics Probed by THz Emission.
In: Physica Status Solidi B. Bd. 204 (1997) Heft 1 . - S. 31-34.
ISSN 1521-3951
DOI: https://doi.org/10.1002/1521-3951(199711)204:1<31::AID-PSSB31>3.0.CO;2-X

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Abstract

THz emission from a narrow-miniband superlattice excited at its lower band edge reveals a hyperbolic bias dependence of the emission frequency. This reflects the emission from Coulomb-renormalized states, namely the anticrossing between the miniband exciton and the hh—2 and hh—1 Wannier-Stark-Ladder states visible in the interband absorption spectra. An analysis of the intraband and interband dephasing times, respectively, reveals that the intraband dynamics remains to be Coulomb-renormalized even after the dephasing of the interband coherence. This demonstrates that THz emission is dominated by long-lived excitionic contributions, in contrast to predictions at a Hartree-Fock level. The dynamics controlled truncation (DCT) approach taking into account the dynamics of the four-point correlation for the intraband current density is able to account for this experimental observation.