Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.186803
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Funding
- Japan Society for the Promotion of Science (JSPS)
- Grants-in-Aid for Scientific Research [23686008, 22109005, 22840004] Funding Source: KAKEN
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The sequence of prominent fractional quantum Hall states up to nu = 5/11 around nu = 1/2 in a high-mobility two-dimensional electron system confined at oxide heterointerface (ZnO) is analyzed in terms of the composite fermion model. The temperature dependence of R-xx oscillations around nu = 1/2 yields an estimation of the composite fermion effective mass, which increases linearly with the magnetic field. This mass is of similar value to an enhanced electron effective mass, which in itself arises from strong electron interaction. The energy gaps of fractional states and the temperature dependence of R-xx at nu = 1/2 point to large residual interactions between composite fermions.
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