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The fractional quantum Hall state (FQHS) observed at a half-filled Landaulevel in an interacting two-dimensional electron system (2DES) is among themost exotic states of matter as its quasiparticles are expected to be Majoranaswith non-Abelian statistics. We demonstrate here the unexpected presence ofsuch a state in a novel 2DES with a strong band-mass anisotropy. The FQHS weobserve has unusual characteristics. While its Hall resistance iswell-quantized at low temperatures, it exhibits highly-anisotropic in-planetransport resembling compressible stripe/nematic charge-density-wave phases.More striking, the anisotropy sets in suddenly below a critical temperature,suggesting a finite-temperature phase transition. Our observations highlighthow anisotropy modifies the many-body phases of a 2DES, and should further fuelthe discussion surrounding the enigmatic even-denominator FQHS.

Unconventional anisotropic even-denominator fractional quantum Hall state in a system with mass anisotropy