Optical transitions and cyclotron resonance at Landau levels split by a periodic potential

1998 ◽  
Vol 87 (5) ◽  
pp. 973-977 ◽  
Author(s):  
V. Ya. Demikhovskii ◽  
A. A. Perov
Keyword(s):  
Cyclotron Resonance ◽  
Periodic Potential ◽  
Landau Levels ◽  
Optical Transitions

MAGNETO-SPECTROSCOPY OF EPITAXIAL GRAPHENE

2007 ◽  
Vol 21 (08n09) ◽  
pp. 1145-1154 ◽  
Author(s):  
M. L. SADOWSKI ◽  
G. MARTINEZ ◽  
M. POTEMSKI ◽  
C. BERGER ◽  
W. A. DE HEER
Keyword(s):  
Magnetic Field ◽  
Cyclotron Resonance ◽  
Far Infrared ◽  
Theoretical Models ◽  
Epitaxial Graphene ◽  
Landau Levels ◽  
Perpendicular Magnetic Field ◽  
Dirac Fermions ◽  
Optical Transitions ◽  
Interband Transitions

We present a far infrared investigation of the optical transitions in epitaxial graphene subjected to a perpendicular magnetic field. Cyclotron-resonance-like transitions between adjacent electron Landau levels are observed, as well as interband transitions. The results are discussed in terms of existing theoretical models of Dirac fermions in graphene, and the relevant optical selection rules.

CHARGE-FLUX DENSITY WAVES: ANYONS IN A PERIODIC POTENTIAL

1991 ◽  
Vol 05 (21) ◽  
pp. 1431-1438
Author(s):  
D. M. Gaitonde ◽  
Sumathi Rao
Keyword(s):  
Flux Density ◽  
Periodic Potential ◽  
Mean Field Theory ◽  
Density Wave ◽  
Mean Field ◽  
Landau Levels ◽  
Filling Fraction ◽  
Lattice Periodicity ◽  
Magnetic Length ◽  
A Charge

We show that the lattice periodicity which causes a modulation of the charge density by a wave vector q also leads to a modulation of the flux density if the charged particles are anyons. Within mean field theory, we obtain a charge and flux density wave (CFDW) where the degenerate Landau levels of a constant magnetic field split into bands. For a weak periodic flux superimposed on a strong constant flux, anyon superconductivity at integer filling of Landau levels (corresponding to a statistics parameter of θ = π(1 − 1/ν) with ν = n = integer ) is not affected. However, at statistics corresponding to non-integer filling of Landau levels, for certain commensurability conditions between the lattice length (a), the magnetic length (l) and the filling fraction (ν), gaps open up at the Fermi level and convert an anyon metal into an anyon insulator.

A many-body projection approach to quantum-limit magneto-optical transition of two-dimensional electrons confined in a parabolic well

1999 ◽  
Vol 77 (3) ◽  
pp. 235-240
Author(s):  
N L Kang ◽  
J Y Ryu ◽  
S D Choi
Keyword(s):  
Temperature Dependence ◽  
Cyclotron Resonance ◽  
Optical Transition ◽  
Quantum Limit ◽  
Optical Transitions ◽  
Two Dimensional ◽  
Many Body ◽  
Projection Technique ◽  
Resonance Linewidth ◽  
Projection Approach

We apply the theory of magneto-optical transitions, introduced earlier by utilizing a many-body projection technique, on a system of electrons scattered by piezoelectric phonons in GaAs; the temperature dependence of the cyclotron resonance linewidth is investigated. It is shown that the width in the quantum limit increases with the temperature.PACS Nos.: 70.00--79.90

scholarly journals LANDAU LEVELS AND QUANTUM GROUP

1994 ◽  
Vol 09 (05) ◽  
pp. 451-458 ◽  
Author(s):  
HARU-TADA SATO
Keyword(s):  
Quantum Group ◽  
Uniform Magnetic Field ◽  
Periodic Potential ◽  
Group Structure ◽  
Quantum Algebra ◽  
Wave Functions ◽  
Landau Levels ◽  
Group Symmetry ◽  
Factor V ◽  
Level Degeneracy

We find a quantum group structure in two-dimensional motions of a nonrelativistic electron in a uniform magnetic field and in a periodic potential. The representation basis of the quantum algebra is composed of wave functions of the system. The quantum group symmetry commutes with the Hamiltonian and is relevant to the Landau level degeneracy. The deformation parameter q of the quantum algebra turns out to be given by the fractional filling factor v=1/m (m odd integer).

Landau Levels and Cyclotron Resonance in Graphite

1962 ◽  
Vol 17 (5) ◽  
pp. 808-819 ◽  
Author(s):  
Masaharu Inoue
Keyword(s):  
Cyclotron Resonance ◽  
Landau Levels

Theory of line widths for optical transitions from impurity levels to Landau levels

1966 ◽  
Vol 5 (4) ◽  
pp. 341-345
Author(s):  
V. A. Kovarskii ◽  
I. A. Chaikovskii
Keyword(s):  
Landau Levels ◽  
Optical Transitions ◽  
Line Widths

HIGH FIELD MAGNETOTRANSPORT IN STRONGLY COUPLED InAs/GaSb SUPERLATTICES

2004 ◽  
Vol 18 (27n29) ◽  
pp. 3699-3704 ◽  
Author(s):  
R. S. DEACON ◽  
R. J. NICHOLAS ◽  
P. SHIELDS ◽  
N. J. MASON
Keyword(s):  
Cyclotron Resonance ◽  
High Field ◽  
Transport Processes ◽  
Landau Levels ◽  
Strongly Coupled ◽  
Resonant Tunnelling ◽  
Longitudinal Optic

Vertical magnetotransport measurements are used to investigate resonant transport processes in strongly coupled InAs / GaSb superlattices. Sample I-V curves display Stark-Cyclotron resonance and longitudinal-optic (LO) phonon mediated transport features. Resonant tunnelling features change dramatically above the magnetophonon condition suggesting that the Landau levels are renormalized due to interaction between LO phonon's and electrons.

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