UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2002 Meeting


Section: Solid State Physics and Materials Science


Title:
Cyclotron resonance in the layered compound InSe at low temperatures


Authors:
D.E.N. Brancus[a] and G. Stan[b]


Affiliation:
[a] Faculty of Physics, Bucharest University, P.O.Box MG-11, Bucharest, Romania

[b] Department of Physics, Colorado State University, Fort Collins, Colorado, 80523, USA


E-mail


Keywords:


Abstract:
The energy levels of a weak-coupling Fröhlich polaron in a uniaxial anisotropic semiconductor with complex structure, placed in a d.c. magnetic field directed along the optical axis, are obtained in the context of the improved Wigner-Brillouin perturbation theory. We consider a quasi-two-dimensional (q-2D) behavior of the conduction electron whereas the phonon system is a three-dimensional one.In order to avoid the real phonon emission phenomenon,the discussion is restricted to the lower branch of the magnetopolaron spectrum. The contributions of all involved sources of anisotropy to the magnetopolaron spectrum are rigorously considered. The q-2D behavior of the electron gas is taken into account by considering a finite extent along the optical axis of the electron wave function.The theoretical results are used to explain the data obtained by measuring the cyclotron resonance in bulk InSe at very low temperatures. In the present work we used two different variational forms of the electron wave function in order to test how sensitive are the results to the particular shape of considered wave functions. Though the two forms are quite different, the results are similar, depending only on the width of the q-2D electron gas. In the particular case of parabolic form of the confining potential along the optical axis, which means a wave function for the fundamental state of Gaussian-type,the theoretical results could be improved by considering the contributions of all intermediate states to the cyclotron resonance phenomenon.