A cascade of phase transitions in an orbitally mixed half-filled Landau level.

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 Adv

journal_title

Science advances

authors

Falson J,Tabrea D,Zhang D,Sodemann I,Kozuka Y,Tsukazaki A,Kawasaki M,von Klitzing K,Smet JH

doi

10.1126/sciadv.aat8742

subject

Has Abstract

pub_date

2018-09-14 00:00:00

pages

eaat8742

issue

9

issn

2375-2548

pii

aat8742

journal_volume

4

pub_type

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