Abstract
We study the effect of subband energy separation and asymmetry on the quasiparticle excitation gaps of the ν=1/2 and coexisting fractional quantum Hall (FQH) states in wide single quantum wells. A new even-denominator FQH state at ν=3/2 and a dramatic subband-mixing-driven phase transition from a one- to two-component FQH state at ν=2/3 are observed. Our results reveal the two-component origin of the ν=1/2 FQH state, and allow us to construct an experimental phase diagram for electron states at half filling.
Original language | English (US) |
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Pages (from-to) | 3405-3408 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 72 |
Issue number | 21 |
DOIs | |
State | Published - 1994 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy