Abstract
In an ideal two-component two-dimensional electron system, particle-hole symmetry dictates that the fractional quantum Hall states around ν=1/2 are equivalent to those around ν=3/2. We demonstrate that composite fermions (CFs) around ν=1/2 in AlAs possess a valley degree of freedom like their counterparts around ν=3/2. However, focusing on ν=2/3 and 4/3, we find that the energy needed to completely valley polarize the CFs around ν=1/2 is considerably smaller than the corresponding value for CFs around ν=3/2, thus betraying a particle-hole symmetry breaking.
| Original language | English (US) |
|---|---|
| Article number | 113301 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 81 |
| Issue number | 11 |
| DOIs | |
| State | Published - Mar 5 2010 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Padmanabhan, M., Gokmen, T., & Shayegan, M. (2010). Composite fermion valley polarization energies: Evidence for particle-hole asymmetry. Physical Review B - Condensed Matter and Materials Physics, 81(11), [113301]. https://doi.org/10.1103/PhysRevB.81.113301