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Metastable bound states of the interacting two-dimensional magnetoexcitons
Inst Appl Phys, Acad Str 5, MD-2028 Kishinev, Moldova..
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2018 (English)In: Solid State Communications, ISSN 0038-1098, E-ISSN 1879-2766, Vol. 283, p. 14-21Article in journal (Refereed) Published
Abstract [en]

The possible formation of two-dimensional (2D) magnetic biexcitons composed of two 2D magnetoexcitons with electrons and holes on the lowest Landau levels (LLLs) with opposite center-of-mass wave vectors (k)over-right-arrow and -(k)over-right-arrow and with antiparallel electric dipole moments perpendicular to the corresponding wave vectors was investigated. Two spinor structures of two electrons and of two holes were considered. In the singlet-singlet state the spins of two electrons as well as the effective spins of two holes create the combinations with the total spin S = 0 and its projection on the magnetic field S-z = 0. The triplet-triplet state corresponds to S = 1 and S-z = 0. Two orbital Gaussian variational wave functions depending on vertical bar(k)over-right-arrow vertical bar and describing the relative motion of two magnetoexcitons inside the molecule were used. Analytical calculations show that in the LLLs approximation the stable bound states of bimagnetoexcitons do not exist, but there is a metastable bound state with the orbital wave function, having the maximum on the in-plane ring for the triplet-triplet spin configuration. The metastable bound state has an energy activation barrier comparable with the magnetoexciton ionization potential and gives rise to the new luminescence band due to the metastable biexciton-para exciton conversion with the frequencies higher than those of the para magnetoexciton luminescence line.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 283, p. 14-21
Keywords [en]
Semiconductors, Exciton, Magnetic field, Interaction
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URN: urn:nbn:se:kth:diva-235865DOI: 10.1016/j.ssc.2018.08.005ISI: 000445230500003Scopus ID: 2-s2.0-85052503119OAI: oai:DiVA.org:kth-235865DiVA, id: diva2:1254459
Note

QC 20181009

Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2018-12-03Bibliographically approved

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Liberman, Michael A.

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