Spin susceptibility of interacting two-dimensional electrons with anisotropic effective mass

T. Gokmen, Medini Padmanabhan, E. Tutuc, M. Shayegan, S. De Palo, S. Moroni, and Gaetano Senatore
Phys. Rev. B 76, 233301 – Published 10 December 2007

Abstract

We report measurements of the spin susceptibility in dilute (rs up to 10) AlAs two-dimensional (2D) electrons occupying a single conduction-band valley with an anisotropic in-plane Fermi contour, characterized by longitudinal and transverse effective masses ml and mt. As the density is decreased, the spin susceptibility is significantly enhanced over its band value, reflecting the role of interaction. Yet the enhancement is suppressed compared to the results of quantum Monte Carlo based calculations that take the finite thickness of the electron layer into account but assume an isotropic effective mass equal to ml.mt. Proper treatment of an interacting 2D system with an anisotropic effective mass therefore remains a theoretical challenge.

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  • Received 29 October 2007

DOI:https://doi.org/10.1103/PhysRevB.76.233301

©2007 American Physical Society

Authors & Affiliations

T. Gokmen1, Medini Padmanabhan1, E. Tutuc1,*, M. Shayegan1, S. De Palo2,3, S. Moroni2,4, and Gaetano Senatore2,3

  • 1Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
  • 2INFM-CNR DEMOCRITOS National Simulation Center, Trieste, Italy
  • 3Dipartimento di Fisica Teorica, Università di Trieste, Strada Costiera 11, 34014 Trieste, Italy
  • 4International School for Advanced Studies (SISSA), I-34014 Trieste, Italy

  • *Present address: Microelectronics Research Center, University of Texas at Austin, Austin, TX 78758, USA.

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Issue

Vol. 76, Iss. 23 — 15 December 2007

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