Conţinutul numărului revistei 
Articolul precedent 
Articolul urmator 
30 0 
SM ISO690:2012 MOSKALENKO, Sveatoslav; KHADZHI, Peter; PODLESNY, Igor; DUMANOV, Evgheni; LIBERMAN, Michael; ZUBAC, Ion. Metastable Bound States of the TwoDimensional Bimagnetoexcitons in the Lowest Landau Levels Approximation. In: Semiconductors. 2018, nr. 14(52), pp. 18011805. ISSN 10637826. 
EXPORT metadate: Google Scholar Crossref CERIF BibTeX DataCite Dublin Core 
Semiconductors  
Numărul 14(52) / 2018 / ISSN 10637826  


DOI: 10.1134/S1063782618140208  
Pag. 18011805  


Rezumat  
Abstract: The possible existence of the bound states of the interacting twodimensional (2D) magnetoexcitons in the lowest Landau levels (LLLs) approximation was investigated using the Landau gauge description. The magnetoexcitons taking part in the formation of the bound state with resultant wave vector k = 0 have opposite inplane wave vectors k and k and look as two electric dipoles with the arms oriented inplane perpendicularly to the corresponding wave vectors. The bound state of two antiparallel dipoles moving with equal probability in any direction of the plane with equal but antiparallel wave vectors is characterized by the variational wave function of the relative motion ϕ_{n}(k) depending on the modulus k. The spins of two electrons and the effective spins of two holes forming the bound states were combined separately in the symmetric or in the antisymmetric forms (↑↓ + η↓↑) with the same parameter η = ±1 for electrons and holes. In the case of the variational wave function ϕ_{2}(k) = (8α^{3})^{1/2}k^{2}I_{0} ^{2}2exp[−αk^{2}I_{0} ^{2}] the maximum density of the magnetoexcitons in the momentum space representation is concentrated on the inplane ring with the radius k_{r} = 1/( αl_{0}). The stable bound states of the bimagnetoexciton molecule do not exist for both spin orientations. Instead of them, a deep metastable bound state with the activation barrier comparable with the ionization potential I_{1} of the magnetoexciton with k=0 was revealed in the case η = 1 and α = 0.5. In the case η = −1 and α = 3.4 only a shallow metastable bound state can appear. 

