Archive: 2010 - Moldavian Journal of the Physical Sciences

05 Feb 2010

2010
V. 9
1
(p.16 - 37)

Collective elementary excitations of two-dimensional magnetoexcitons in the bose-einstein condensation state with wave vector k = 0

Authors:

Moscalenco, Sveatoslav; Liberman, Michael; Dumanov, Evgheni; Rusu, Spiridon; Sanduleac, Ionel

Summary:

The collective elementary excitations of the two-dimensional magnetoexcitons in a state of Bose-Einstein condensation (BEC) with wave vector k = 0 were investigated in terms of the Bogoliubov theory of quasiaverages. The starting Hamiltonian of the electrons and holes lying on the lowest Landau levels (LLLs) contains the supplementary interactions due to the virtual quantum transitions of the particles to the excited Landau levels (ELLs) and return back. As a result, the interaction between the magnetoexcitons with k = 0 does not vanish and their BEC becomes stable as regards the collapse. The energy spectrum of the collective elementary excitations consists of two exciton-type branches (energy and quasienergy branches) each of them with energy gap and roton-type section, the gapless optical plasmon branch, and the acoustical plasmon branch, which reveals the absolute instability in the range of small wave vectors.

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Bogoliubov theory of quasiaverages. The starting Hamiltonian of the electrons and holes lying 
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quantum transitions of the particles to the excited Landau levels (ELLs) and return back. As a 
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BibTeX

@article{ibn_4205,
author = {Moscalenco, S.A. and Liberman, M.A. and Dumanov, E.V. and Rusu, S.S. and Sanduleac, I.I.},
title = {Collective elementary excitations of 
two-dimensional magnetoexcitons in the 
bose-einstein condensation state with wave vector k = 0  },
journal = {Moldavian Journal of the Physical Sciences},
year = {2010},
volume = {9 (1)},
pages = {16-37},
month = {Feb},
abstract = {(EN) The collective elementary excitations of the two-dimensional magnetoexcitons in a state 

of Bose-Einstein condensation (BEC) with wave vector  k =
 0  were investigated in terms of the 
Bogoliubov theory of quasiaverages. The starting Hamiltonian of the electrons and holes lying 
on the lowest Landau levels (LLLs) contains the supplementary interactions due to the virtual 
quantum transitions of the particles to the excited Landau levels (ELLs) and return back. As a 
result, the interaction between the magnetoexcitons with  k =
 0  does not vanish and their BEC 
becomes stable as regards the collapse. The energy spectrum of the collective elementary excitations consists of two exciton-type branches (energy and quasienergy branches) each of them 
with energy gap and roton-type section, the gapless optical plasmon branch, and the acoustical 
plasmon branch, which reveals the absolute instability in the range of small wave vectors. },
url = {https://ibn.idsi.md/vizualizare_articol/4205},
}

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bose-einstein condensation state with wave vector k = 0  </title>
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 0  were investigated in terms of the 
Bogoliubov theory of quasiaverages. The starting Hamiltonian of the electrons and holes lying 
on the lowest Landau levels (LLLs) contains the supplementary interactions due to the virtual 
quantum transitions of the particles to the excited Landau levels (ELLs) and return back. As a 
result, the interaction between the magnetoexcitons with  k =
 0  does not vanish and their BEC 
becomes stable as regards the collapse. The energy spectrum of the collective elementary excitations consists of two exciton-type branches (energy and quasienergy branches) each of them 
with energy gap and roton-type section, the gapless optical plasmon branch, and the acoustical 
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<dc:creator>Dumanov, E.V.</dc:creator>
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<dc:date>2010-02-05</dc:date>
<dc:description xml:lang='en'>The collective elementary excitations of the two-dimensional magnetoexcitons in a state 

of Bose-Einstein condensation (BEC) with wave vector  k =
 0  were investigated in terms of the 
Bogoliubov theory of quasiaverages. The starting Hamiltonian of the electrons and holes lying 
on the lowest Landau levels (LLLs) contains the supplementary interactions due to the virtual 
quantum transitions of the particles to the excited Landau levels (ELLs) and return back. As a 
result, the interaction between the magnetoexcitons with  k =
 0  does not vanish and their BEC 
becomes stable as regards the collapse. The energy spectrum of the collective elementary excitations consists of two exciton-type branches (energy and quasienergy branches) each of them 
with energy gap and roton-type section, the gapless optical plasmon branch, and the acoustical 
plasmon branch, which reveals the absolute instability in the range of small wave vectors. </dc:description>
<dc:source>Moldavian Journal of the Physical Sciences 9 (1) 16-37</dc:source>
<dc:title>Collective elementary excitations of 
two-dimensional magnetoexcitons in the 
bose-einstein condensation state with wave vector k = 0  </dc:title>
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“ ... ”

SM ISO690:2012

MOSKALENKO, Sveatoslav; LIBERMAN, Michael; DUMANOV, Evgheni; RUSU, Spiridon; SANDULEAC, Ionel. Collective elementary excitations of two-dimensional magnetoexcitons in the bose-einstein condensation state with wave vector k = 0 . In: Moldavian Journal of the Physical Sciences. 2010, nr. 1(9), pp. 16-37. ISSN 1810-648X.