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We measure the effective mass in a dilute two-dimensional electron system in(111)-silicon by analyzing temperature dependence of the Shubnikov-de Haasoscillations in the low-temperature limit. A strong enhancement of theeffective mass with decreasing electron density is observed. The massrenormalization as a function of the interaction parameter r_s is in goodagreement with that reported for (100)-silicon, which shows that the relativemass enhancement is system- and disorder-independent being determined byelectron-electron interactions only.

Strongly enhanced effective mass in dilute two-dimensional electron systems: System-independent origin