Direct observation of the intersubband Bernstein modes: Many-body coupling with spin- and charge-density excitations

V. E. Kirpichev; L. V. Kulik; I. V. Kukushkin; K. v. Klitzing; K. Eberl; W. Wegscheider

doi:10.1103/PhysRevB.59.R12751

Rapid Communication

Direct observation of the intersubband Bernstein modes: Many-body coupling with spin- and charge-density excitations

V. E. Kirpichev, L. V. Kulik, I. V. Kukushkin, K. v. Klitzing, K. Eberl, and W. Wegscheider

Phys. Rev. B 59, R12751(R) – Published 15 May 1999

Abstract

The spectrum of collective intersubband magneto excitations in a quasi-two-dimensional electron system confined in a single quantum well has been studied by inelastic light scattering spectroscopy. Intersubband Bernstein modes with a change of the Landau level index up to three were observed in a perpendicular magnetic field. It is demonstrated that Bernstein modes couple with intersubband charge and spin density excitations through many-body Coulomb interaction, and the coupling strength is governed by the in-plane momentum. Detailed measurements of the coupling strength dispersion were performed and compared with theoretical simulations.

Received 17 December 1998

DOI:https://doi.org/10.1103/PhysRevB.59.R12751

Authors & Affiliations

V. E. Kirpichev

Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
Institute of Solid State Physics, RAS, Chernogolovka, 142432, Russia

L. V. Kulik

Institute of Solid State Physics, RAS, Chernogolovka, 142432, Russia

I. V. Kukushkin

Max-Planck-Institüt für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
Institute of Solid State Physics, RAS, Chernogolovka, 142432, Russia

K. v. Klitzing and K. Eberl