TY - JOUR
T1 - Microwave conductivity resonance of two-dimensional hole system
AU - Li, C. C.
AU - Engel, L. W.
AU - Shahar, D.
AU - Tsui, D. C.
AU - Shayegan, M.
PY - 1997/1/1
Y1 - 1997/1/1
N2 - We have measured microwave conductivity, Re(σxx), of a high quality two-dimensional hole system (2DHS) in the high magnetic field (B) insulating phase for frequency (f) between 0.2 and 9 GHz. For V < 0.3, Re(σxx) vs f shows a well-defined peak at frequency fpk. As B is increased, the maximal Re(σxx) increases. The resonance Q (fpk divided by full line width at half maximum) increases linearly with B. fpk vs B increases, but is nearly flat, at 1.25 GHz, for B≥10T. Oscillator strength, S, measured by integrating the spectrum, is likewise flat for B≥10T. The simultaneously B-independent S and fpk are inconsistent with the conventional (Fukuyama-Lee) interpretation of the resonance as a Wigner crystal pinning mode.
AB - We have measured microwave conductivity, Re(σxx), of a high quality two-dimensional hole system (2DHS) in the high magnetic field (B) insulating phase for frequency (f) between 0.2 and 9 GHz. For V < 0.3, Re(σxx) vs f shows a well-defined peak at frequency fpk. As B is increased, the maximal Re(σxx) increases. The resonance Q (fpk divided by full line width at half maximum) increases linearly with B. fpk vs B increases, but is nearly flat, at 1.25 GHz, for B≥10T. Oscillator strength, S, measured by integrating the spectrum, is likewise flat for B≥10T. The simultaneously B-independent S and fpk are inconsistent with the conventional (Fukuyama-Lee) interpretation of the resonance as a Wigner crystal pinning mode.
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U2 - 10.1103/PhysRevLett.79.1353
DO - 10.1103/PhysRevLett.79.1353
M3 - Article
AN - SCOPUS:0000096451
SN - 0031-9007
VL - 79
SP - 1353
EP - 1356
JO - Physical review letters
JF - Physical review letters
IS - 7
ER -