Regensburg 1998 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 21: Quantendr
ähte

HL 21.3: Vortrag

Dienstag, 24. März 1998, 16:30–16:45, H1

Theory of resonant Raman scattering of quantum wires — •B. Kramer¹ and M. Sassetti² — ¹I. Institut f"ur Theoretische Physik, Universit"at Hamburg, Jungiusstraße 9, D-20355 Hamburg — ²Istituto di Fisica di Ingegneria, INFM, Università di Genova, Via Dodecaneso 33, I-16146 Genova

The cross section for Raman scattering from a one dimensional gas of interacting electrons is calculated by using the Luttinger model. We show that the peak in the resonant Raman spectra of quantum wires in the polarized configuration of incoming and scattered light, which is commonly associated with ”single particle excitations”, can be interpreted as the signature of intraband spin excitations. In the depolarized spectra, a broad maximum is predicted to exist between the frequencies of the spin and the charge density excitations, due to simultaneous but independent propagation of spin- and charge-density modes.

[1] M. Sassetti und B. Kramer, preprint