Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.256601
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Funding
- National Science Foundation [DMR-1644779, DMR 1709076, ECCS 1508925, MRSEC DMR 1420541]
- U.S. Department of Energy Basic Energy Science [DE-FG02-00-ER45841]
- Gordon and Betty Moore Foundation [GBMF5305, GBMF4420]
- QuantEmX grants from Institute for Complex Adaptive Matter
- State of Florida
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The fractional quantum Hall state (FQHS) observed at a half-filled Landau level in an interacting two-dimensional electron system (2DES) is among the most exotic states of matter as its quasiparticles are expected to be Majorana excitations with non-Abelian statistics. We demonstrate here the unexpected presence of such a state in a novel 2DES with a strong band-mass anisotropy. The FQHS we observe has unusual characteristics. While its Hall resistance is well quantized at low temperatures, it exhibits highly anisotropic in-plane transport resembling compressible stripe or nematic charge-density-wave phases. More striking, the anisotropy sets in suddenly below a critical temperature, suggesting a finite-temperature phase transition. Our observations highlight how anisotropy modifies the many-body phases of a 2DES, and should further fuel the discussion surrounding the enigmatic even-denominator FQHS.
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