421 citations · 1.1k across the 13 of their papers we have counts for
9 papers · 1 filter
Domain Textures in the Fractional Quantum Hall Effect
Ziyu Liu, Ursula Wurstbauer, Lingjie Du +4
Impacts of domain textures on low-lying neutral excitations in the bulk of fractional quantum Hall effect (FQHE) systems are probed by resonant inelastic light scattering. We demon…
Observation of flat bands in gated semiconductor artificial graphene
Lingjie Du, Ziyu Liu, Shalom J. Wind +6
Flat bands near M points in the Brillouin zone are key features of honeycomb symmetry in artificial graphene (AG) where electrons may condense into novel correlated phases. Here we…
Observation of new plasmons in the fractional quantum Hall effect: interplay of topological and nematic orders
Lingjie Du, Ursula Wurstbauer, Ken W. West +5
Collective modes of exotic quantum fluids reveal underlying physical mechanisms responsible for emergent complex quantum ground states. We observe unexpected new collective modes i…
Tuning Edge States in Strained-Layer InAs/GaInSb Quantum Spin Hall Insulators
Lingjie Du, Tingxin Li, Wenkai Lou +8
We report on a class of quantum spin Hall insulators (QSHIs) in strained-layer InAs/GaInSb quantum wells, in which the bulk gaps are enhanced by up to five folds as compared to the…
Observation of a Helical Luttinger-Liquid in InAs/GaSb Quantum Spin Hall Edges
Tingxin Li, Pengjie Wang, Hailong Fu +8
We report on the observation of a helical Luttinger-liquid in the edge of InAs/GaSb quantum spin Hall insulator, which shows characteristic suppression of conductance at low temper…
Gate-Tuned Spontaneous Exciton Insulator in Double-Quantum Wells
Lingjie Du, Wenkai Lou, Kai Chang +2
It was proposed that a dilute semimetal is unstable against the formation of an exciton insulator, however experimental confirmations have remained elusive. We investigate the orig…
De-Pinning Transition of Bubble Phases in a High Landau Level
Xuebin Wang, Hailong Fu, Lingjie Du +6
While in the lowest Landau level the electron-electron interaction leads to the formation of the Wigner crystal, in higher Landau levels a solid phase with multiple electrons in a…
Images of edge current in InAs/GaSb quantum wells
Eric M. Spanton, Katja C. Nowack, Lingjie Du +3
Quantum spin Hall devices with edges much longer than several microns do not display ballistic transport: that is, their measured conductances are much less than per edge.…
Observation of Quantum Spin Hall States in InAs/GaSb Bilayers under Broken Time-Reversal Symmetry
Lingjie Du, Ivan Knez, Gerard Sullivan +1
Topological insulators (TIs) are a novel class of materials with nontrivial surface or edge states. Time-reversal symmetry (TRS) protected TIs are characterized by the Z2 topologic…