TY - JOUR
T1 - Composite fermion valley polarization energies
T2 - Evidence for particle-hole asymmetry
AU - Padmanabhan, Medini
AU - Gokmen, T.
AU - Shayegan, M.
PY - 2010/3/5
Y1 - 2010/3/5
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.81.113301
DO - 10.1103/PhysRevB.81.113301
M3 - Article
AN - SCOPUS:77954995445
SN - 1098-0121
VL - 81
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 11
M1 - 113301
ER -