Anomalous Resistance Ridges Along Filling Factor ν= 4i
K. Takashina, M. Brun, T. Ota, D. K. Maude, A. Fujiwara, Y. Ono, Y. Takahashi, Y. Hirayama
Abstract
We report anomalous structure in the magnetoresistance of SiO2/Si(100)/SiO2 quantum wells. When Landau levels of opposite valleys are driven through coincidence at the Fermi level, the longitudinal resistance displays elevations at filling factors that are integer multiples of 4 (ν=4i) accompanied by suppression on either side of ν=4i. This persists when either magnetic field or valley splitting is swept leading to resistance ridges running along ν=4i. The range of field over which they are observed points to the role of spin degeneracy, which is directly confirmed by their disappearance under in-plane magnetic field. The data suggest a new type of many-body effect due to the combined degeneracy of valley and spin.
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