THE TEMPERATURE DEPENDENCE OF THE HALF-WIDTHS OF INTERNAL ABSORPTION LINES IN BORON-DOPED SILICON

1967 ◽  
Vol 45 (9) ◽  
pp. 2879-2888 ◽  
Author(s):  
R. R. Parsons ◽  
J. W. Bichard
Keyword(s):  
Ground State ◽  
Phonon Coupling ◽  
Boron Doped ◽  
Electron Phonon Coupling ◽  
Doped Silicon ◽  
Internal States ◽  
Phonon Lifetime ◽  
Width Measurements ◽  
Lifetime Effects ◽  
Internal Absorption

For boron-doped silicon at temperatures less than 60 °K, half-width measurements for those absorption peaks corresponding to transitions from the ground state to the 2P′ and 3P′ internal states are presented. These half-widths are attributed to concentration and electron–phonon lifetime effects. The major contribution to the phonon broadening appears to be due to electron–phonon coupling of the internal states to the P3/2 Bloch states.

LATTICE DYNAMICS AND ANYON SUPERCONDUCTORS

1990 ◽  
Vol 04 (18) ◽  
pp. 1143-1151 ◽  
Author(s):  
D.M. GAITONDE ◽  
SUMATHI RAO
Keyword(s):  
Magnetic Field ◽  
Gauge Field ◽  
Spectral Function ◽  
Carrier Concentration ◽  
Ground State ◽  
Lattice Dynamics ◽  
Phonon Coupling ◽  
Dominant Effect ◽  
Electron Phonon Coupling ◽  
New Type

We consider a model of anyons—fermions coupled to a statistical gauge field—also coupled to phonons via the usual electron-phonon coupling. We study the phonon response when the system is in the superconducting anyon ground state and show the existence of peaks in the phonon spectral function whose frequencies shift with carrier concentration. We suggest that when the electron-phonon coupling is the dominant effect, there could arise a new type of BCS ground state with a spontaneously generated P and T violating supercurrent, that expels the statistical magnetic field.

Interchain Alignments and Ground State in Organic Ferromagnets

1998 ◽  
Vol 12 (28) ◽  
pp. 1167-1174
Author(s):  
W. Z. Wang ◽  
K. L. Yao ◽  
H. Q. Lin
Keyword(s):  
Spin Density ◽  
Ground State ◽  
Main Chain ◽  
Phonon Coupling ◽  
Structure Transition ◽  
Interchain Coupling ◽  
Ferromagnetic Structure ◽  
Phase Alignment ◽  
Electron Phonon Coupling ◽  
Organic Ferromagnets

Two kinds of alignments of two neighboring π-conjugated organic ferromagnetic chains are studied by considering the itinerary of electrons, electron–phonon coupling, the Hubbard repulsion and the interchain coupling. It is shown that the out-of-phase alignment is a more stable ferromagnetic structure than in-phase alignment. For out-of-phase alignment, there is a structure transition at a critical interchain coupling, at which the dimerizations of two chains have the same size and reverse sign. Interchain coupling results in transfer of spin density between each main chain and the side radicals.

Laser induced Fano scattering, electron–phonon coupling, bond length and phonon lifetime changes in α-Fe2O3 nanostructures

2020 ◽  
Vol 22 (4) ◽  
pp. 2001-2009 ◽  
Author(s):  
Anoop Sunny ◽  
Arun Thirumurugan ◽  
Karthikeyan Balasubramanian
Keyword(s):  
Bond Length ◽  
Precipitation Method ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Phonon Lifetime ◽  
Co Precipitation

We have extensively studied the laser-induced Fano scattering, electron–phonon coupling, bond length and phonon lifetime of the α-Fe2O3 nanostructure prepared through a simple co-precipitation method.

Bound polaron in a narrow-band polar crystal

1993 ◽  
Vol 71 (11-12) ◽  
pp. 493-500
Author(s):  
Y. Lépine ◽  
O. Schönborn
Keyword(s):  
Effective Mass ◽  
Ground State ◽  
Narrow Band ◽  
Wave Functions ◽  
Phonon Coupling ◽  
Polar Crystal ◽  
Bound Polaron ◽  
Narrow Bandwidth ◽  
Electron Phonon Coupling ◽  
Shallow Impurities

The ground-state energy of a bound polaron in a narrow-band polar crystal (such as a metal oxide) is studied using variational wave functions. We use a Fröhlich-type Hamiltonian on which the effective mass approximation has not been effected and in which a Debye cutoff is made on the phonon wave vectors. The wave functions that are used are general enough to allow the existence of a band state and of a self-trapped state and are reliable in the nonadiabatic limit. We find that three ground states are possible for this system. First, for small electron–phonon coupling, moderate bandwidth, and shallow impurities, the usual effective-mass hydrogenic ground state is found. For a narrow bandwidth and a deep defect, a collapsed state is predicted in which the polaron coincides with the position of the defect. Finally, for moderate electron–phonon coupling, narrow bandwidth, and a very weak defect, a self-trapped polaron in a hydrogenic state is predicted. Our conclusions are presented as asymptotic expansions and as phase diagrams indicating the values of the parameters for which each phase can be found.

ABSORPTION-LINE BROADENING IN BORON-DOPED SILICON

1967 ◽  
Vol 45 (8) ◽  
pp. 2797-2804 ◽  
Author(s):  
J. J. White
Keyword(s):  
Absorption Line ◽  
Excited States ◽  
Half Width ◽  
Line Broadening ◽  
Additional Information ◽  
Boron Doped ◽  
Doped Silicon ◽  
Time Part ◽  
Width Measurements ◽  
First Time

In boron-doped silicon, the excitation of bound holes from the acceptor ground state to the excited states leads to an infrared absorption-line spectrum. In a recent half-width study of the boron absorption lines, Colbow (1963) separated the various line-broadening contributions for the first time. Part of Colbow's half-widths is now found to be due to external strains introduced by the sample mounting. New half-width measurements of "strain-free" mounted boron-doped silicon are presented, Colbow's work is corrected, and additional information regarding the various broadening contributions is given.

SELF-TRAPPING TRANSITION OF ACOUSTIC POLARON IN SLAB

2013 ◽  
Vol 27 (08) ◽  
pp. 1350050
Author(s):  
JUNHUA HOU ◽  
XIAOMING DONG ◽  
XIAOFENG DUAN
Keyword(s):  
Ground State Energy ◽  
Ground State ◽  
State Energy ◽  
Alkali Halides ◽  
2D Systems ◽  
Phonon Coupling ◽  
Length Unit ◽  
First Derivative ◽  
Electron Phonon Coupling ◽  
Self Trapping

Self-trapping transition of the acoustic polaron in slab is researched by calculating the polaron ground state energy and the first derivative of the ground state energy with respect to the electron–phonon coupling. It is indicated that the possibility of self-trapping transition for acoustic polaron in slab fall in between 3D and 2D systems. The electron may be self-trapped in slab systems of GaN , AlN and alkali halides, if the slab systems are thinner than one over ten of the length unit ℏ/mc.

ELECTRON-PHONON COUPLING IN HEAVILY DOPED SILICON

2001 ◽  
Author(s):  
P. KIVINEN ◽  
A. SAVIN ◽  
A. MANNINEN ◽  
J. PEKOLA ◽  
M. PRUNNILA ◽  
...  
Keyword(s):  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Doped Silicon ◽  
Heavily Doped

PROPERTIES OF IMPURITY BOUND MAGNETOPOLARON IN QUANTUM RODS

2011 ◽  
Vol 25 (01) ◽  
pp. 21-30
Author(s):  
WEI XIAO ◽  
JING-LIN XIAO
Keyword(s):  
Binding Energy ◽  
Aspect Ratio ◽  
Ground State ◽  
Coupling Strength ◽  
Vibrational Frequency ◽  
Cyclotron Frequency ◽  
Phonon Coupling ◽  
Ground State Binding Energy ◽  
Electron Phonon Coupling ◽  
Bound Magnetopolaron

The Hamiltonian of a quantum rod with an ellipsoidal boundary is given after a coordinate transformation, which changes the ellipsoidal boundary into a spherical one. We then study the vibrational frequency and the ground state binding energy of the weak-coupling impurity bound magnetopolaron in it. The effects of the aspect ratio of the ellipsoid, the transverse effective confinement lengths, the electron-phonon coupling strength, the magnetic field cyclotron frequency and the Coulomb bound potential are taken into consideration by using linear combination operator method. It is found that the vibrational frequency and the ground state binding energy will increase with increasing Coulomb bound potential and the cyclotron frequency. They are decreasing functions of the aspect ratio of the ellipsoid and the transverse effective confinement lengths, whereas the ground state binding energy is an increasing function of the electron-phonon coupling strength.

A CONCISE APPROACH FOR ONE-DIMENSIONAL HOLSTEIN MODEL

2007 ◽  
Vol 21 (23n24) ◽  
pp. 4230-4233 ◽  
Author(s):  
QING-BAO REN ◽  
QING-HU CHEN
Keyword(s):  
Ground State ◽  
Variational Approach ◽  
Higher Dimensions ◽  
Density Matrix Renormalization Group ◽  
Phonon Coupling ◽  
One Dimensional ◽  
Density Matrix Renormalization ◽  
Holstein Model ◽  
Electron Phonon Coupling ◽  
Good Agreement

A concise variational approach is to propose to calculate the ground-state properties of none-dimensional Holstein model. The results in the weak and strong coupling limit can be easily recovered analytically. It is shown that, in the nontrivial intermediate electron-phonon coupling regime, the present results are in good agreement with those by density-matrix renormalization group and numerical exact diagonalizations. The present approach is more concise than any other analytical ones in this field, and can be easily generalized to Holstein models in higher dimensions and with more electrons.

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