Intervalley gap anomaly of two-dimensional electrons in silicon

K. Lai, W. Pan, D. C. Tsui, S. Lyon, M. Mühlberger, F. Schäffler

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We report here a systematic study of the energy gaps at the odd-integer quantum Hall states ν=3 and 5 under tilted magnetic (B) fields in a high quality Si two-dimensional electron system. Out of the coincidence region, the valley splitting is independent of the in-plane B fields. However, the ν=3 valley gap differs by about a factor of 3 (Δv∼0.4 vs 1.2 K) on different sides of the coincidence. More surprisingly, instead of reducing to zero, the energy gaps at ν=3 and 5 rise rapidly when approaching the coincidence angles. We believe that such an anomaly is related to strong couplings of the nearly degenerate Landau levels.

Original languageEnglish (US)
Article number076805
JournalPhysical review letters
Issue number7
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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