Valley-Tunable Even-Denominator Fractional Quantum Hall State in the Lowest Landau Level of an Anisotropic System

Hossain, Md. Shafayat; Ma, Meng K.; Chung, Y. J.; Singh, S. K.; Gupta, A.; West, K. W.; Baldwin, K. W.; Pfeiffer, L. N.; Winkler, R.; Shayegan, M.

doi:10.1103/physrevlett.130.126301

Valley-Tunable Even-Denominator Fractional Quantum Hall State in the Lowest Landau Level of an Anisotropic System

Journal Article · Mon Mar 20 00:00:00 EDT 2023 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.130.126301· OSTI ID:2418927

^[1]; Ma, Meng K. ^[2]; Chung, Y. J. ^[2]; Singh, S. K. ^[2]; Gupta, A. ^[2]; West, K. W. ^[2]; Baldwin, K. W. ^[2]; Pfeiffer, L. N. ^[2]; ^[3]; ^[2]

Princeton Univ., NJ (United States); OSTI
Princeton Univ., NJ (United States)
Northern Illinois Univ., DeKalb, IL (United States)

Fractional quantum Hall states (FQHSs) at even-denominator Landau level filling factors (v) are of prime interest as they are predicted to host exotic, topological states of matter. Here, we report here the observation of a FQHS at v = 1/2 in a two-dimensional electron system of exceptionally high quality, confined to a wide AlAs quantum well, where the electrons can occupy multiple conduction-band valleys with an anisotropic effective mass. The anisotropy and multivalley degree of freedom offer an unprecedented tunability of the v = 1/2 FQHS as we can control both the valley occupancy via the application of in-plane strain, and the ratio between the strengths of the short- and long-range Coulomb interaction by tilting the sample in the magnetic field to change the electron charge distribution. Thanks to this tunability, we observe phase transitions from a compressible Fermi liquid to an incompressible FQHS and then to an insulating phase as a function of tilt angle. We find that this evolution and the energy gap of the v = 1/2 FQHS depend strongly on valley occupancy.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Gordon and Betty Moore Foundation (GBMF)

Grant/Contract Number:: FG02-00ER45841

OSTI ID:: 2418927

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 130; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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