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Conductivity of Optically Excited Electrons in GaAs in Quantizing Magnetic Fields

100%

Łusakowski J., Grynberg M., Huant S.

Acta Physica Polonica A

1995

vol. 87

issue 2

482-486

Magnetoconductivity (σ) measurements on an n-type molecular beam epitaxy grown epitaxial layer and on a bulk liquid encapsulated Czochralski grown undoped semi-insulating GaAs samples were performed for magnetic fields (B) up to 21 T at 4.2 K. To enable current measurements in a wide range of B both samples were permanently illuminated with a band-to-band light. It is shown that for sufficiently high magnetic fields σ(B) dependence is the same for both materials. This result underlines a role of scattering by long-range fluctuations of the electrostatic potential in high-quality n-GaAs in quantizing magnetic fields.

Scanning-Gate Microscopy of Semiconductor Nanostructures: An Overview

64%

Martins F., Hackens B., Sellier H., Liu P., Pala M., Baltazar S., Desplanque L., Wallart X., Bayot V., Huant S.

Acta Physica Polonica A

2011

vol. 119

issue 5

569-575

This paper presents an overview of scanning-gate microscopy applied to the imaging of electron transport through buried semiconductor nanostructures. After a brief description of the technique and of its possible artifacts, we give a summary of some of its most instructive achievements found in the literature and we present an updated review of our own research. It focuses on the imaging of GaInAs-based quantum rings both in the low magnetic field Aharonov-Bohm regime and in the high-field quantum Hall regime. In all of the given examples, we emphasize how a local-probe approach is able to shed new, or complementary, light on transport phenomena which are usually studied by means of macroscopic conductance measurements.

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2 Acta Physica Polonica A

1 2011

1 1995

2 Huant S.

1 Baltazar S.

1 Bayot V.

1 Desplanque L.

1 Grynberg M.

1 Hackens B.

1 Liu P.

1 Martins F.

1 Pala M.

1 Sellier H.

1 Wallart X.

1 Łusakowski J.

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Conductivity of Optically Excited Electrons in GaAs in Quantizing Magnetic Fields

Scanning-Gate Microscopy of Semiconductor Nanostructures: An Overview