Journal ArticleDOI
Experimental demonstration of a Fermi surface at one-half filling of the lowest Landau level.
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The first direct observation of the cyclotron motion of new quasiparticles in a 2D electron system near 1/2 filling factor is reported, and resonance of a surface sound wave with cyclotrons orbits of charge carriers is observed.Abstract:
We report the first direct observation of the cyclotron motion of new quasiparticles in a 2D electron system near 1/2 filling factor. Just as electrons in a metal geometrically resonate with a sound wave when a magnetic field is applied perpendicular to the sound propagation direction, near 1/2 filling factor we observe resonance of a surface sound wave with cyclotron orbits of charge carriers. The presence of a Fermi surface and geometric resonance of a sound wave with Chern-Simons gauge transformed fermions were explicitly predicted in a recent theory of the half filled Landau levelread more
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Journal ArticleDOI
Imaging the granular structure of high-Tc superconductivity in underdoped Bi2Sr2CaCu2O8+x
Kristine Lang,Vidya Madhavan,Jennifer Hoffman,Eric Hudson,Hiroshi Eisaki,S. Uchida,J. C. Davis +6 more
TL;DR: In this article, the spatial interrelationships between STM tunneling spectra in underdoped Bi2Sr2CaCu2O8+x were investigated and it was shown that the electronic structure can be divided into 3nm diameter domains with superconducting characteristics and local energy gap delta 50(2.5) meV.
Journal ArticleDOI
High-frequency single-electron transport in a quasi-one-dimensional GaAs channel induced by surface acoustic waves.
J. M. Shilton,V. I. Talyanskii,Michael Pepper,David A. Ritchie,J. E. F. Frost,C. J. B. Ford,Charles G. Smith,G. A. C. Jones +7 more
TL;DR: An experimental investigation of the direct current induced by transmitting a surface acoustic wave (SAW) through a quasi-one-dimensional (1D) channel defined in a GaAs - AlGaAs heterostructure by a split gate finds that at low SAW power levels the current reveals oscillatory behaviour as a function of the gate voltage with maxima between the plateaux of quantized 1D conductance.
Journal ArticleDOI
Tunable interacting composite fermion phases in a half-filled bilayer-graphene Landau level.
Alexander Zibrov,Carlos Kometter,Haoxin Zhou,Eric Spanton,Takashi Taniguchi,Kenji Watanabe,Michael P. Zaletel,Andrea Young +7 more
TL;DR: Graphene is established as a pristine and tunable experimental platform for studying the interplay between topology and quantum criticality, and for detecting non-Abelian qubits.
Journal ArticleDOI
Theory of the half-filled Landau level
TL;DR: A recent theory of a compressible Fermi-liquid-like state at Landau level filling factors nu =1/q or 1-1/ q, q even, is reviewed, with emphasis on the basic physical concepts.
Journal ArticleDOI
Continuum of Chiral Luttinger Liquids at the Fractional Quantum Hall Edge
TL;DR: In this paper, the authors studied the power law for tunneling into the edge of the fractional quantum Hall effect over a continuum of filling factors from 1/4 to 1.