Abstract:
:Half-filled Landau levels host an emergent Fermi liquid that displays instability toward pairing, culminating in a gapped even-denominator fractional quantum Hall ground state. While this pairing may be probed by tuning the polarization of carriers in competing orbital and spin degrees of freedom, sufficiently high quality platforms offering such tunability remain few. We explore the ground states at filling factor ν = 5/2 in ZnO-based two-dimensional electron systems through a forced intersection of opposing spin branches of Landau levels taking quantum numbers N = 1 and 0. We reveal a cascade of phases with distinct magnetotransport features including a gapped phase polarized in the N = 1 level and a compressible phase in N = 0, along with an unexpected Fermi liquid, a second gapped, and a strongly anisotropic nematic-like phase at intermediate polarizations when the levels are near degeneracy. The phase diagram is produced by analyzing the proximity of the intersecting levels and highlights the excellent reproducibility and controllability that ZnO offers for exploring exotic fractionalized electronic phases.
journal_name
Sci Advjournal_title
Science advancesauthors
Falson J,Tabrea D,Zhang D,Sodemann I,Kozuka Y,Tsukazaki A,Kawasaki M,von Klitzing K,Smet JHdoi
10.1126/sciadv.aat8742subject
Has Abstractpub_date
2018-09-14 00:00:00pages
eaat8742issue
9issn
2375-2548pii
aat8742journal_volume
4pub_type
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