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We have performed magnetoresistance measurements up to 20 T on high-mobility two-dimensional electron gases in single AlAs quantum wells with well widths ranging from 40 to 80Å. We observe a sharp transition from a two-fold valley degenerate X xy occupied state in a 60Åwell to a non-degenerate X z occupied state in a 40Åwell. These two states are distinguished by their different effective...
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