Sulfur passivation of semi-insulating GaAs: Transition from Coulomb blockade to weak localization regime
- Autores: Bagraev N.1,2, Chaikina E.3, Danilovskii E.1, Gets D.1, Klyachkin L.1, L’vova T.1, Malyarenko A.1
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Afiliações:
- Ioffe Institute
- Peter the Great St. Petersburg Polytechnic University
- Division de Fisica Aplicada
- Edição: Volume 50, Nº 4 (2016)
- Páginas: 466-477
- Seção: Semiconductor Structures, Low-Dimensional Systems, and Quantum Phenomena
- URL: https://journals.rcsi.science/1063-7826/article/view/196980
- DOI: https://doi.org/10.1134/S1063782616040060
- ID: 196980
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Resumo
The sulfur passivation of the semi-insulating GaAs bulk (SI GaAs) grown in an excess phase of arsenic is used to observe the transition from the Coulomb blockade to the weak localization regime at room temperature. The I–V characteristics of the SI GaAs device reveal nonlinear behavior that appears to be evidence of the Coulomb blockade process as well as the Coulomb oscillations. The sulfur passivation of the SI GaAs device surface results in enormous transformation of the I–V characteristics that demonstrate the strong increase of the resistance and Coulomb blockade regime is replaced by the electron tunneling processes. The results obtained are analyzed within frameworks of disordering SI GaAs surface that is caused by inhomogeneous distribution of the donor and acceptor anti-site defects which affects the conditions of quantum- mechanical tunneling. Weak localization processes caused by the preservation of the Fermi level pinning are demonstrated by measuring the negative magnetoresistance in weak magnetic fields at room temperature. Finally, the studies of the magnetoresistance at higher magnetic fields reveal the h/2e Aharonov–Altshuler–Spivak oscillations with the complicated behavior due to possible statistical mismatch of the interference paths in the presence of different microdefects.
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Sobre autores
N. Bagraev
Ioffe Institute; Peter the Great St. Petersburg Polytechnic University
Autor responsável pela correspondência
Email: Bagraev@mail.ioffe.ru
Rússia, St. Petersburg, 194021; St. Petersburg, 195251
E. Chaikina
Division de Fisica Aplicada
Email: Bagraev@mail.ioffe.ru
México, Carretera Ensenada-Tijuana no. 3918, Ensenada, Baja California, 22860
E. Danilovskii
Ioffe Institute
Email: Bagraev@mail.ioffe.ru
Rússia, St. Petersburg, 194021
D. Gets
Ioffe Institute
Email: Bagraev@mail.ioffe.ru
Rússia, St. Petersburg, 194021
L. Klyachkin
Ioffe Institute
Email: Bagraev@mail.ioffe.ru
Rússia, St. Petersburg, 194021
T. L’vova
Ioffe Institute
Email: Bagraev@mail.ioffe.ru
Rússia, St. Petersburg, 194021
A. Malyarenko
Ioffe Institute
Email: Bagraev@mail.ioffe.ru
Rússia, St. Petersburg, 194021