Abstract
The fractional quantum Hall (FQH) effect emerges in high-quality two-dimensional electron systems exposed to a magnetic field when the Landau-level filling factor, 1/2 e, takes on a rational value. Although the overwhelming majority of FQH states have odd-denominator fillings, the physical properties of the rare and fragile even-denominator states are most tantalizing in view of their potential relevance for topological quantum computation. For decades, GaAs has been the preferred host for studying these even-denominator states, where they occur at - 1/2 e = 5/2 and 7/2. Here we report an anomalous series of quantized even-denominator FQH states outside the realm of III-V semiconductors in the MgZnO/ZnO 2DES electron at - 1/2 e = 3/2 and 7/2, with precursor features at 9/2; all while the 5/2 state is absent. The effect in this material occurs concomitantly with tunability of the orbital character of electrons at the chemical potential, thereby realizing a new experimental means for investigating these exotic ground states.
Original language | English |
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Pages (from-to) | 347-351 |
Number of pages | 5 |
Journal | Nature Physics |
Volume | 11 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2015 Apr 8 |
ASJC Scopus subject areas
- Physics and Astronomy(all)