The in-plane magnetic field (B-parallel to) dependence of cyclotron mass (m(C)) in two-dimensional electron system has been measured. In addition to the increment of m(C) with B-parallel to, the split of m(C) by B-parallel to is observed near the filling factor of Landau level v = 2. Some possible origins on this splitting are discussed. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 15]
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