Abstract
The excitation spectrum of GaAs has been studied by reflection electron energy loss spectroscopy. In addition to dominant collective excitations, a series of single-electron transitions of a core Ga 3d electron to previously unknown unoccupied states located above the Fermi level by 1.25, 3.7, and 6.8 eV have been detected in the spectrum. It has been shown that the detected states appear near the ion core of Ga because of an increase in its effective charge at excitation. Since the detected electronic levels are equidistant, they can be described by a subnanometer spherical quantum dot model. It has been shown that one of the decay channels of the detected states involves the emission of ultraviolet radiation.
Similar content being viewed by others
References
A. P. Alivisatos, Science (Washington, DC, U. S.) 271, 933 (1996).
M. A. Kastner, Phys. Today 46, 24 (1993).
R. C. Ashoori, Nature (London, U.K.) 379, 413 (1996).
U. Banin, Y. W. Cao, D. Katz, and O. Millo, Nature (London, U.K.) 400, 542 (1999).
V. M. Mikoushkin, JETP Lett. 107, 243 (2018).
V. M. Mikoushkin, Semiconductors 52, 2061 (2018).
I. T. McGovern, K. D. Childs, H. M. Clearfields, and R. H. Williams, J. Phys. C: Solid State Phys. 14, L243 (1981).
R. J. Radwanski and Z. Ropka, Acta Phys. 2, 1 (2007).
V. J. Keast, A. J. Scott, M. J. Kappers, C. T. Foxon, and C. J. Humphreys, Phys. Rev. B 66, 125319 (2002).
A. M. Sánchez, M. Gass, A. J. Papworth, P. J. Goodhew, and P. Ruterana, Phys. Rev. B 70, 035325 (2004).
V. M. Mikoushkin, Nucl. Instrum. Methods Phys. Res. 354, 100 (2015).
A. E. Zhukov, E. S. Semenova, V. M. Ustinov, and E. R. Weber, Tech. Phys. 46, 1265 (2001).
S. Tanuma, V. J. Powell, and D. R. Penn, Surf. Interface Anal. 17, 927 (1991).
J. F. Ziegler, J. P. Biersack, and M. D. Ziegler, SRIM—The Stopping and Range of Ions in Matter (SRIM, Chester, Maryland, 2008).
D. Briggs and M. P. Seah, Practical Surface Analysis by Auger and X-Ray Photoelectron Spectroscopy (Wiley, New York, 1983).
V. M. Mikoushkin, V. V. Bryzgalov, S. Yu. Nikonov, A. P. Solonitsyna, and D. E. Marchenko, Eur. Phys. Lett. 122, 27002 (2018).
D. Haneman, J. Phys. Chem. Solids 11, 205 (1959).
R. T. Sanderson, J. Am. Chem. Soc. 105, 2259 (1983).
Funding
This work was supported by the Russian Science Foundation (project no. 17-19-01200-P).
Author information
Authors and Affiliations
Corresponding author
Additional information
Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 112, No. 12, pp. 801–806.
Rights and permissions
About this article
Cite this article
Mikoushkin, V.M. Unoccupied Atomic-Like States of GaAs. Jetp Lett. 112, 764–768 (2020). https://doi.org/10.1134/S0021364020240078
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0021364020240078