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Some results on the dependence of the 2D electron effective mass on temperature and magnetic field

Recent experimental and theoretical results have suggested that the effective mass m* of the electrons in a 2D gas, as measured by the temperature dependence of the Shubnikov-de Haas oscillations in the resistivity, is a function of x=kT/h(cross) omega c, i.e. the ratio of the thermal broadening to the Landau level separation. In this letter the authors demonstrate that m* in their sample is unchanged at x=0.5 and must be greater than 0.4 m0* at x=1.0, where m0* is the normal effective mass.