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Phys. Rev. Lett. 91, 046403 (2003) [4 pages]

Spin-Independent Origin of the Strongly Enhanced Effective Mass in a Dilute 2D Electron System

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A. A. Shashkin *, Maryam Rahimi, S. Anissimova, and S. V. Kravchenko
Physics Department, Northeastern University, Boston, Massachusetts 02115, USA

V. T. Dolgopolov
Institute of Solid State Physics, Chernogolovka, Moscow District 142432, Russia

T. M. Klapwijk
Department of Applied Physics, Delft University of Technology, 2628 CJ Delft, The Netherlands

Received 13 January 2003; published 24 July 2003

We accurately measure the effective mass in a dilute two-dimensional electron system in silicon by analyzing the temperature dependence of the Shubnikov–de Haas oscillations in the low-temperature limit. A sharp increase of the effective mass with decreasing electron density is observed. We find that the enhanced effective mass is independent of the degree of spin polarization, which points to a spin-independent origin of the mass enhancement and is in contradiction with existing theories.


©2003 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.91.046403
DOI: 10.1103/PhysRevLett.91.046403
PACS: 71.30.+h, 71.18.+y, 73.40.Qv

* Permanent address: Institute of Solid State Physics, Chernogolovka, Moscow District 142432, Russia.

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