Quantum magnetotransport properties of silicene: Influence of the acoustic phonon correction

2021 ◽  
Vol 104 (7) ◽  
Author(s):  
Hong T. T. Nguyen ◽  
Le Dinh ◽  
Tuan V. Vu ◽  
Le T. Hoa ◽  
Nguyen N. Hieu ◽  
...  
Keyword(s):  
Acoustic Phonon

The Urbach Rule for the Sodium- and Potassium-Halides

1974 ◽  
Vol 29 (1) ◽  
pp. 145-157 ◽  
Author(s):  
Tetsuhiko Tomiki ◽  
Takeo Miyata ◽  
Hirokazu Tsukamoto
Keyword(s):  
Temperature Dependence ◽  
Acoustic Phonon ◽  
Frequency Factor ◽  
Host Lattice ◽  
Exciton Peak ◽  
Urbach Rule ◽  
Temperature Dependences ◽  
Hole Band ◽  
Sodium And Potassium ◽  
Potassium Halides

Phenomenological and physical aspects of the intrinsic tail spectra of the alkalihalides are studied referring to the new results on the intrinsic tail spectra of KBr and KI and to the temperature dependences of the lowest-energy Γ-exciton peak of the sodium- and potassium-halides. Systematically analysing the temperature dependence of the steepness parameter σs (T) of the Urbach rule for these halides, it is found that the frequency factor has the value nearly equal to the acoustic phonon energy at X or L of each host lattice and the steepness constant σs0 becomes larger in passing from fluoride to iodide. This halogen dependence of σs0 is discussed in terms of the hole band-mass of the Γ8-level.

scholarly journals Giant phonon anomalies in the proximate Kitaev quantum spin liquid α-RuCl3

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Haoxiang Li ◽  
T. T. Zhang ◽  
A. Said ◽  
G. Fabbris ◽  
D. G. Mazzone ◽  
...  
Keyword(s):  
Acoustic Phonon ◽  
Energy Scale ◽  
Quantum Spin ◽  
Majorana Fermion ◽  
Spin Liquid ◽  
Optical Phonons ◽  
Large Intensity ◽  
Topological Quantum ◽  
Topological State ◽  
Quantum Spin Liquid

AbstractThe Kitaev quantum spin liquid epitomizes an entangled topological state, for which two flavors of fractionalized low-energy excitations are predicted: the itinerant Majorana fermion and the Z2 gauge flux. It was proposed recently that fingerprints of fractional excitations are encoded in the phonon spectra of Kitaev quantum spin liquids through a novel fractional-excitation-phonon coupling. Here, we detect anomalous phonon effects in α-RuCl3 using inelastic X-ray scattering with meV resolution. At high temperature, we discover interlaced optical phonons intercepting a transverse acoustic phonon between 3 and 7 meV. Upon decreasing temperature, the optical phonons display a large intensity enhancement near the Kitaev energy, JK~8 meV, that coincides with a giant acoustic phonon softening near the Z2 gauge flux energy scale. These phonon anomalies signify the coupling of phonon and Kitaev magnetic excitations in α-RuCl3 and demonstrates a proof-of-principle method to detect anomalous excitations in topological quantum materials.

COMPARISON OF LOW FIELD ELECTRON TRANSPORT IN SiC AND GaN STRUCTURES FOR HIGH-POWER AND HIGH-TEMPERATURE DEVICE MODELING

2008 ◽  
Vol 22 (13) ◽  
pp. 1357-1366 ◽  
Author(s):  
M. REZAEE ROKN-ABADI ◽  
H. ARABSHAHI ◽  
M. R. BENAM
Keyword(s):  
Electron Mobility ◽  
Born Approximation ◽  
Acoustic Phonon ◽  
Experimental Methods ◽  
Phase Shift Analysis ◽  
Device Modeling ◽  
Polar Optical Phonon ◽  
Relaxation Time Approximation ◽  
Low Field ◽  
Shift Analysis

Temperature and doping dependencies of electron mobility in SiC and GaN structures have been calculated using an iteravive technique. The following scattering mechanisims, i.e. impurity, polar optical phonon, acoustic phonon, piezoelectric and electron–plasmon are included in the calculation. Ionized imurity scattering has been treated beyond the Born approximation using the phase-shift analysis. It is found that the electron mobility decreases monotonically as the temperature increases from 100 K to 600 K. The low temperature value of electron mobilty increases significantly with increasing doping concentration. The iterative results are in fair agreement with other recent calculations obtained using the relaxation-time approximation and experimental methods.

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