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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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 the magnetic field or the 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 with the addition of an in-plane magnetic field. The data suggest a new type of many-body effect arising from the combined degeneracy due to the valley and the spin degrees of freedom.

Original languageEnglish
Article number036803
JournalPhysical review letters
Issue number3
Publication statusPublished - 2007 Jul 19

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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