Free-exciton energy spectrum in GaAs

1976 ◽  
Vol 13 (2) ◽  
pp. 761-767 ◽  
Author(s):  
S. B. Nam ◽  
D. C. Reynolds ◽  
C. W. Litton ◽  
R. J. Almassy ◽  
T. C. Collins ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Free Exciton ◽  
Exciton Energy

Free-exciton energy spectrum in InP in a magnetic field

1976 ◽  
Vol 13 (4) ◽  
pp. 1643-1648 ◽  
Author(s):  
S. B. Nam ◽  
D. C. Reynolds ◽  
C. W. Litton ◽  
T. C. Collins ◽  
P. J. Dean ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energy Spectrum ◽  
Free Exciton ◽  
Exciton Energy

Free Exciton Energy Transfer in KrAu Sandwiches

1981 ◽  
Vol 106 (1) ◽  
pp. 183-192 ◽  
Author(s):  
N. Schwentner ◽  
G. Martens ◽  
H. W. Rudolf
Keyword(s):  
Energy Transfer ◽  
Free Exciton ◽  
Exciton Energy

PHOTOLUMINESCENCE OF A HIGH MOBILITY 2DEG IN THE FRACTIONAL QUANTUM HALL EFFECT REGIME

2007 ◽  
Vol 21 (08n09) ◽  
pp. 1455-1459
Author(s):  
D. SMIRNOV ◽  
V. V. RUDENKOV ◽  
B. M. ASHKINADZE ◽  
E. COHEN ◽  
P. C. M. CHRISTIANEN ◽  
...  
Keyword(s):  
Quantum Hall Effect ◽  
Free Exciton ◽  
Quantum Hall ◽  
High Mobility ◽  
Fractional Quantum Hall Effect ◽  
Exciton Energy ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Circularly Polarized ◽  
Spectral Changes

The magneto-PL spectra of modulation-doped, ultra-high mobility GaAs/AlGaAs single heterojunctions (HJs) were studied under a perpendicularly applied magnetic field up to 33 T and at temperatures of 0.3 and 1.2 K. The spectra show remarkable intensity redistribution between free (bulk) exciton and 2DEG-hole PL channels occurring at electron filling factors, ν = 2 and 1. At 0.3 K, significant 2DEG-hole PL spectral changes are observed near ν = 2/3 and 1/3. Several heterojunctions with 2DEG density in the range of n2D - (1 - 2.7) · 1011 cm -2 display similar features. These spectral peculiarities are attributed to the modification of the 2DEG energy spectrum caused by the e-e interaction, in particular, the recombination of valence hole with the composite (fractionally-charged) particles of the magnetized 2DEG. In HJs with lower n2D < 1011 cm -2, the observed PL evolution at ν < 1 is mainly determined by an intensity redistribution between the σ+ and σ- circularly-polarized free exciton PL components. In this case, the exciton energy is lower than the energy of the 2DEG-hole system, so that the free excitons do not dissociate near the magnetized 2DEG and thus, the 2DEG-hole PL is barely observed.

PHOTOPHYSICAL OVERVIEW OF EXCITATION ENERGY TRANSFER IN ORGANIC MOLECULAR ASSEMBLIES — A ROUTE TO STUDY BIO-MOLECULAR ARRAYS —

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3857-3860 ◽  
Author(s):  
A. H. MATSUI ◽  
M. TAKESHIMA ◽  
K. MIZUNO ◽  
T. AOKI-MATSUMOTO
Keyword(s):  
Energy Transport ◽  
Free Exciton ◽  
Excitation Energy Transfer ◽  
Molecular Crystals ◽  
Chemical Species ◽  
Systematic Change ◽  
Bulk Crystals ◽  
Exciton Energy ◽  
Two Parameters ◽  
Constituent Molecule

Excitonic processes in organic molecular crystals are discussed in terms of two parameters, the crystal size and the constituent molecule size. From the luminescence and absorption spectra of a series of aromatic molecular crystals we find a systematic change in exciton energy transport as functions of the size of crystal and its constituent molecule size. Characteristic features of bulk crystals and microcrystallites are as follows. (1) In bulk crystals exciton energy transport depends on the constituent molecule size. When molecules are small, the exciton energy transport occurs by free excitons, but when molecules are large free exciton transport disappears because excitons get self-trapped. (2) In microcrystallites, exciton energy transport depends on the crystallite size. When the size is larger than a critical one, excitons travel as quantum mechanical waves but when the size is smaller than the critical one the exciton waves get confined within the crystallite. The results are independent of the chemical species of constituent molecules and thus applicable to novel molecular arrays such as biological molecular arrays.

Influence of the size effect in the exciton energy spectrum on exciton relaxation in rare gas clusters

2006 ◽  
Vol 32 (10) ◽  
pp. 946-952 ◽  
Author(s):  
É. T. Verkhovtseva ◽  
Yu. S. Doronin ◽  
A. M. Ratner ◽  
E. A. Bondarenko
Keyword(s):  
Energy Spectrum ◽  
Size Effect ◽  
Rare Gas ◽  
Exciton Energy ◽  
Gas Clusters ◽  
Rare Gas Clusters

Determination of the free exciton energy in ZnO nanorods from photoluminescence excitation spectroscopy

2007 ◽  
Vol 102 (1) ◽  
pp. 013511 ◽  
Author(s):  
H. P. He ◽  
Z. Z. Ye ◽  
S. S. Lin ◽  
H. P. Tang ◽  
Y. Z. Zhang ◽  
...  
Keyword(s):  
Free Exciton ◽  
Zno Nanorods ◽  
Photoluminescence Excitation ◽  
Exciton Energy

Exciton energy spectrum in GaAs in a magnetic field

1976 ◽  
Vol 12-13 ◽  
pp. 277-284 ◽  
Author(s):  
S.B. Nam ◽  
D.C. Reynolds ◽  
C.W. Litton
Keyword(s):  
Magnetic Field ◽  
Energy Spectrum ◽  
Exciton Energy

scholarly journals Тонкая структура ридберговских экситонов в закиси меди

2018 ◽  
Vol 60 (8) ◽  
pp. 1515 ◽  
Author(s):  
М.А. Семина
Keyword(s):  
Energy Spectrum ◽  
Experimental Studies ◽  
Theoretical Description ◽  
Energy Band Structure ◽  
Exciton Energy ◽  
Elastic Deformations ◽  
Electric And Magnetic Fields ◽  
The 1960S ◽  
Second Wave ◽  
Spectrum Response

AbstractIn 1952, E.F. Gross and N.A. Karryev discovered excitons of big radius also called the Wannier–Mott excitons. Their energy spectrum, response to external electric and magnetic fields, and also elastic deformations of a crystal were extensively studied in the 1960s–1970s. The second wave of interest to excitons in Cu_2O crystals appeared comparatively recent, in 2014, after the “giant” highly excited exciton states had been observed in this material. A theoretical description of highly excited exciton states needs, as a rule, new approaches, because, for such states, a deviation from the exactly solved hydrogen-like model becomes substantial and a numerical solution of the Schrödinger equation with allowance made for the features of the crystal energy band structure becomes extremely resource consuming. This report is a brief review of recent theoretical and experimental studies of the fine structure of the exciton energy spectrum in copper protoxide.

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