EXCITONIC QUASI-MOLECULE FORMED BY SPATIALLY SEPARATED ELECTRONS AND HOLES IN Ge/Si HETEROSTRUCTURES WITH QUANTUM DOTS OF GERMANIUM
Abstract
It is shown that in Ge/Si quantum nanoheterostructures, two germanium dots can be treated as excitonic quasi-molecule on the surfaces of which excitons (consisting of spatially separated electrons and holes) are localized. The effect of a significant increase in the binding energy is found for the ground singlet state of an excitonic quasi-molecule in a nanoscale system as compared to the biexciton binding energy in the silicon single crystal. It was found that the main contribution to the binding energy of the quasi-molecule comes from exchange interaction between electrons and holes, which is significantly greater than that of Coulomb interaction between electrons and holes.
About the Author
S. I. Pokutnyi
A. A. Chuіko Institute of Surface Chemistry, National Academy of Sciences of Ukraine
Russian Federation
Russian Federation
References
1. А. И. Якимов, А. В. Двуреченский, А. И. Никифоров. Письма в ЖЭТФ, 73, № 4 (2001) 598-602
2. Ж. В. Смагина, А. В. Двуреченский, В. А. Селезнев. ФТП, 49, № 6 (2015) 767-772
3. С. И. Покутний. Физика низких темпер., 42, № 12 (2016) 1471-1476
4. S. I. Pokutnyi, Y. N. Kulchin, V. P. Dzyuba, A. V. Amosov. J. Nanophoton., 10, N 3 (2016) 036008-(1-8); doi: 10.1117/1.JNP.10.036008
5. K. Lalumiure, B. Sanders, F. Van Loo. Phys. Rev. A, 88, N 10 (2013) 43806-43812
6. F. Van Loo, A. Fedorov, K. Lalumiure. Science, 342, N 6 (2013) 1494-1496
7. S. I. Pokutnyi. Semiconductors, 47, N 12 (2013) 1626-1635; doi: 10.1134/S1063782613060225
8. S. I. Pokutnyi. Semiconductors, 47, N 6 (2013) 791-798; doi: 10.1134/S1063782613120178
9. Ю. И. Уханов. Оптические свойства полупроводников, Москва, Наука (1977) 44-46
10. S. V. Gaponenko. Introduction to Nanophotonics, New York, Cambridge University Press (2010) 224-232
11. S. V. Gaponenko, H. V. Demir, C. Seassal. Opt. Express, 24, N 2 (2016) 430-434
Review
For citations:
Pokutnyi S.I. EXCITONIC QUASI-MOLECULE FORMED BY SPATIALLY SEPARATED ELECTRONS AND HOLES IN Ge/Si HETEROSTRUCTURES WITH QUANTUM DOTS OF GERMANIUM. Zhurnal Prikladnoii Spektroskopii. 2017;84(2):248-252. (In Russ.)
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