Resonant Raman scattering of quantum wire in strong magnetic field

TL;DR

This paper investigates how strong magnetic fields and Coulomb interactions influence resonant Raman scattering in quantum wires, revealing characteristic cross-over behaviors and peak broadening effects due to spin-charge separation.

Contribution

It provides new insights into the impact of long-range Coulomb interactions and spin-charge separation on Raman scattering in quantum wires under strong magnetic fields.

Findings

Inter-edge Coulomb interaction causes characteristic cross-over behavior.

Resonance peaks become broad due to charge velocity dispersion.

Disparity between charge and spin velocities explains broad peaks in spectra.

Abstract

The resonant Raman scattering of a quantum wire in a strong magnetic field is studied, focused on the effect of long range Coulomb interaction and the spin-charge separation. The energy-momentum dispersions of charge and spin excitation obtained from Raman cross-section show the characteristc cross-over behaviour induced by inter-edge Coulomb interaction. The "SPE" peak near resonance in polarized spectra becomes broad due to the momentum dependence of charge velocity. The broad peak in the depolarized spectra is shown to originate from the disparity between charge and spin excitation velocity.