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

L. Bockhorn; D. Schuh; C. Reichl; W. Wegscheider; R. J. Haug

doi:10.1103/PhysRevB.109.205416

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

L. Bockhorn, D. Schuh, C. Reichl, W. Wegscheider, R. J. Haug

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

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.

Originalsprache	Englisch
Aufsatznummer	205416
Fachzeitschrift	Physical Review B
Jahrgang	109
Ausgabenummer	20
DOIs	https://doi.org/10.1103/PhysRevB.109.205416
Publikationsstatus	Veröffentlicht - 13 Mai 2024

ASJC Scopus Sachgebiete

Elektronische, optische und magnetische Materialien
Physik der kondensierten Materie

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10.1103/PhysRevB.109.205416Lizenz: CC BY 4.0

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QuantumFrontiers: Exzellenzcluster 2123/1: Licht und Materie an der Quantengrenze
Schmidt, P. O. (Projektleiter*in (Principal Investigator)), Ospelkaus-Schwarzer, S. (Projektleiter*in (Principal Investigator)), Chichkov, B. (Projektleiter*in (Principal Investigator)), Danzmann, K. (Projektleiter*in (Principal Investigator)), Ertmer, W. (Projektleiter*in (Principal Investigator)), Hammerer, K. J. (Projektleiter*in (Principal Investigator)), Haug, R. (Projektleiter*in (Principal Investigator)), Heinzel, G. (Projektleiter*in (Principal Investigator)), Heurs, M. (Projektleiter*in (Principal Investigator)), Klempt, C. (Projektleiter*in (Principal Investigator)), Kroker, S. (Projektleiter*in (Principal Investigator)), Lisdat, C. (Projektleiter*in (Principal Investigator)), Mehlstäubler, T. (Projektleiter*in (Principal Investigator)), Müller, J. (Projektleiter*in (Principal Investigator)), Ospelkaus, C. (Projektleiter*in (Principal Investigator)), Rasel, E. M. (Projektleiter*in (Principal Investigator)), Recher, P. (Projektleiter*in (Principal Investigator)), Santos, L. S. (Projektleiter*in (Principal Investigator)), Schilling, M. (Projektleiter*in (Principal Investigator)), Schlickum, U. (Projektleiter*in (Principal Investigator)), Schumacher, H. W. (Projektleiter*in (Principal Investigator)), Surzhykov, A. (Projektleiter*in (Principal Investigator)), Waag, A. (Projektleiter*in (Principal Investigator)), Werner, R. (Projektleiter*in (Principal Investigator)) & Willke, B. (Projektleiter*in (Principal Investigator))
1 Jan. 2019 → 31 Dez. 2025
Projekt: Forschung

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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

Abstract

ASJC Scopus Sachgebiete

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Projekte

QuantumFrontiers: Exzellenzcluster 2123/1: Licht und Materie an der Quantengrenze

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