Anomalous High-Temperature Magnetoresistance in a Dilute 2D Hole System

Arvind Shankar Kumar, Chieh Wen Liu, Shuhao Liu, Xuan P.A. Gao, Alex Levchenko, Loren N. Pfeiffer, Kenneth W. West

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We report an unusual magnetoresistance that strengthens with the temperature in a dilute two-dimensional (2D) hole system in GaAs/AlGaAs quantum wells with densities p=1.98-0.99×1010/cm2 where rs, the ratio between Coulomb energy and Fermi energy, is as large as 20-30. We show that, while the system exhibits a negative parabolic magnetoresistance at low temperatures (≲0.4 K) characteristic of an interacting Fermi liquid, a positive magnetoresistance emerges unexpectedly at higher temperatures, and grows with increasing temperature even in the regime T∼EF, close to the Fermi energy. This unusual positive magnetoresistance at high temperatures can be attributed to the viscous transport of 2D hole fluid in the hydrodynamic regime where holes scatter frequently with each other. These findings give insight into the collective transport of strongly interacting carriers in the rs≫1 regime and new routes toward magnetoresistance at high temperatures.

Original languageEnglish (US)
Article number266302
JournalPhysical review letters
Issue number26
StatePublished - Jun 30 2023
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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