Influence of the electron density on the giant negative magnetoresistance in two-dimensional electron gases

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  • University of Regensburg
  • ETH Zurich
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Original languageEnglish
Article number205416
JournalPhysical Review B
Volume109
Issue number20
Publication statusPublished - 13 May 2024

Abstract

In situ variation of the electron density via a metallic gate can control the disorder potentials in two-dimensional electron gases (2DEGs). This also influences the negative magnetoresistance at low magnetic fields, which is commonly observed in ultrahigh mobility 2DEGs. We investigate the temperature-dependent giant negative magnetoresistance (GNMR) as a function of the electron density for several temperatures and currents. Thereby, we find that the GNMR behavior depends decisively on the electron density. This observation is attributed to a changed disorder potential with electron density. In the case of higher electron densities, a nonlinear current dependency of the GNMR is observed, which could be described within the hydrodynamic regime.

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Influence of the electron density on the giant negative magnetoresistance in two-dimensional electron gases. / Bockhorn, L.; Schuh, D.; Reichl, C. et al.
In: Physical Review B, Vol. 109, No. 20, 205416, 13.05.2024.

Research output: Contribution to journalArticleResearchpeer review

Bockhorn L, Schuh D, Reichl C, Wegscheider W, Haug RJ. Influence of the electron density on the giant negative magnetoresistance in two-dimensional electron gases. Physical Review B. 2024 May 13;109(20):205416. doi: 10.1103/PhysRevB.109.205416
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AU - Schuh, D.

AU - Reichl, C.

AU - Wegscheider, W.

AU - Haug, R. J.

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