scholarly journals Landau levels in deformed bilayer graphene at low magnetic fields

2011 ◽  
Vol 151 (16) ◽  
pp. 1088-1093 ◽  
Author(s):  
Marcin Mucha-Kruczyński ◽  
Igor L. Aleiner ◽  
Vladimir I. Fal’ko
Keyword(s):  
Magnetic Fields ◽  
Bilayer Graphene ◽  
Landau Levels

Probe of the Band Structure of MBE Grown p-Type InMnAs at Ultrahigh Magnetic Fields

SPIN ◽  
2015 ◽  
Vol 05 (01) ◽  
pp. 1550002 ◽  
Author(s):  
Y. Sun ◽  
F. V. Kyrychenko ◽  
G. D. Sanders ◽  
C. J. Stanton ◽  
G. A. Khodaparast ◽  
...  
Keyword(s):  
Optical Properties ◽  
Magnetic Fields ◽  
Band Structure ◽  
Heavy Hole ◽  
Theoretical Calculations ◽  
Interaction Strength ◽  
Golden Rule ◽  
Exchange Interactions ◽  
Landau Levels ◽  
P Type

We present a theoretical and experimental study on electronic and magneto-optical properties of p-type paramagnetic InMnAs dilute magnetic semiconductor (DMS) alloys in ultrahigh (> 100 T) external magnetic fields (B). Theoretical calculations are based on an 8-band Pidgeon–Brown model which is generalized to include the wavevector dependence of the electronic states along B as well as s–d and p–d exchange interactions with localized Mn d-electrons. The spin-dependent electronic structure as a function of Mn doping is computed and the dependence of the valence band structure on parameters such as the sp–d exchange interaction strength and effective masses in paramagnetic p- InMnAs alloys are examined. The cyclotron resonance (CR) and magneto-optical properties of InMnAs are calculated using Fermi's golden rule. Two strong CR peaks are observed in p-type InMnAs alloys which correspond to the transitions within either heavy-hole (HH) or light-hole (LH) Landau levels. Furthermore, we also observed strong resonance absorption for electron-active polarization which can occur in p-type semiconductors originating from transitions between the light and heavy hole Landau levels.

Electronic and optical properties of monolayer and bilayer graphene

2010 ◽  
Vol 368 (1932) ◽  
pp. 5445-5458 ◽  
Author(s):  
Y. H. Ho ◽  
J. Y. Wu ◽  
Y. H. Chiu ◽  
J. Wang ◽  
M. F. Lin
Keyword(s):  
Optical Properties ◽  
Bilayer Graphene ◽  
Landau Levels ◽  
Optical Measurements ◽  
Monolayer Graphene ◽  
Zero Field ◽  
Electronic And Optical Properties ◽  
Graphene Layers ◽  
Lower Pair ◽  
Dependent Absorption

The electronic and optical properties of monolayer and bilayer graphene are investigated to verify the effects of interlayer interactions and external magnetic field. Monolayer graphene exhibits linear bands in the low-energy region. Then the interlayer interactions in bilayers change these bands into two pairs of parabolic bands, where the lower pair is slightly overlapped and the occupied states are asymmetric with respect to the unoccupied ones. The characteristics of zero-field electronic structures are directly reflected in the Landau levels. In monolayer and bilayer graphene, these levels can be classified into one and two groups, respectively. With respect to the optical transitions between the Landau levels, bilayer graphene possesses much richer spectral features in comparison with monolayers, such as four kinds of absorption channels and double-peaked absorption lines. The explicit wave functions can further elucidate the frequency-dependent absorption rates and the complex optical selection rules. These numerical calculations would be useful in identifying the optical measurements on graphene layers.

SUPERCONDUCTIVITY IN HIGH AND VERY HIGH MAGNETIC FIELDS

1991 ◽  
Vol 05 (01n02) ◽  
pp. 353-363 ◽  
Author(s):  
Zlatko Tešanović
Keyword(s):  
Magnetic Fields ◽  
Order Parameter ◽  
Landau Levels ◽  
High Magnetic Fields ◽  
Type Ii ◽  
Type Ii Superconductors ◽  
Low Field ◽  
Starting Point ◽  
Electronic Motion ◽  
Very High

An external magnetic field can actually enhance superconductivity, pro vided it is strong enough. If only few lowest Landau levels are occupied, the quasi 1D nature of the electronic motion leads to an enhancement of transition temperature. The orbital frustration of the order parameter is much simplified in this limit. This limit of superconductivity, of great interest in itself, can also be used as a starting point to study orbital frustration in familiar, “low-field”, strongly type II superconductors. I briefly review some of the characteristics of superconductivity in high magnetic fields.

scholarly journals LARGE-N COLLECTIVE FIELD THEORY APPLIED TO ANYONS IN MAGNETIC FIELDS

1993 ◽  
Vol 08 (37) ◽  
pp. 3547-3555 ◽  
Author(s):  
HIDEAKI HIRO-OKA ◽  
HISAKAZU MINAKATA
Keyword(s):  
Field Theory ◽  
Dispersion Relation ◽  
Magnetic Fields ◽  
Landau Levels ◽  
Collective Modes ◽  
Statistical Parameters ◽  
Soluble Model ◽  
Large N ◽  
Field Formalism ◽  
Body Potential

We present a large-N collective field formalism for anyons in external magnetic fields interacting with an arbitrary two-body potential. We discuss how the Landau levels are reproduced in our framework. We apply it to the soluble model for anyons proposed by Girvin et al., and obtain the dispersion relation of the collective modes for arbitrary statistical parameters.

Landau levels in a simple hexagonal bilayer graphene

2008 ◽  
Vol 372 (3) ◽  
pp. 292-298 ◽  
Author(s):  
Y.H. Lai ◽  
C.P. Chang ◽  
J.H. Ho ◽  
C.H. Ho ◽  
M.F. Lin
Keyword(s):  
Bilayer Graphene ◽  
Landau Levels
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