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Measurements of the density-dependent many-body electron mass in 2D GaAs/AlGaAs Heterostructures | | Y.-W. Tan
; J. Zhu
; H. L. Stormer
; L. N. Pfeiffer
; K. W. Baldwin
; K. W. West
; | | Date: |
10 Dec 2004 | | Journal: | Phys. Rev. Lett. 94, 016405 (2005) DOI: 10.1103/PhysRevLett.94.016405 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | Affiliation: | 1,3,4), L. N. Pfeiffer , K. W. Baldwin , and K. W. West (Department of Physics, Columbia University, Department of Physics, Cornell University, Department of Applied Physics and Applied Mathematics, Columbia University, and Bell Labs, Lucent Technolo | | Abstract: | We determine the density-dependent electron mass, m*, in two-dimensional (2D) electron systems of GaAs/AlGaAs heterostructures by performing detailed low-temperature Shubnikov deHaas measurements. Using very high quality transistors with tunable electron densities we measure m* in single, high mobility specimens over a wide range of r_s (6 to 0.8). Toward low-densities we observe a rapid increase of m* by as much as 40%. For 2>r_s>0.8 the mass values fall ~10% below the band mass of GaAs. Numerical calculations are in qualitative agreement with our data but differ considerably in detail. | | Source: | arXiv, cond-mat/0412260 | | Services: | Forum | Review | PDF | Favorites | |
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