Journal
PHYSICAL REVIEW B
Volume 81, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.113301
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Funding
- NSF [DMR-0654118]
- DOE
- State of Florida
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [GRANTS:13963917] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0904117] Funding Source: National Science Foundation
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In an ideal two-component two-dimensional electron system, particle-hole symmetry dictates that the fractional quantum Hall states around nu=1/2 are equivalent to those around nu=3/2. We demonstrate that composite fermions (CFs) around nu=1/2 in AlAs possess a valley degree of freedom like their counterparts around nu=3/2. However, focusing on nu=2/3 and 4/3, we find that the energy needed to completely valley polarize the CFs around nu=1/2 is considerably smaller than the corresponding value for CFs around nu=3/2, thus betraying a particle-hole symmetry breaking.
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