scholarly journals Quantitative Transport Measurements of Fractional Quantum Hall Energy Gaps in Edgeless Graphene Devices

2018 ◽  
Vol 121 (22) ◽  
Author(s):  
H. Polshyn ◽  
H. Zhou ◽  
E. M. Spanton ◽  
T. Taniguchi ◽  
K. Watanabe ◽  
...  
Keyword(s):  
Quantum Hall ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Energy Gaps ◽  
Transport Measurements ◽  
Graphene Devices

Phonon and transport measurements in the fractional quantum Hall effect

2008 ◽  
Vol 245 (2) ◽  
pp. 409-420 ◽  
Author(s):  
Fritz Schulze-Wischeler ◽  
Annelene F. Dethlefsen ◽  
Frank Hohls ◽  
Uli Zeitler ◽  
Rolf J. Haug
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Fractional Quantum Hall Effect ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Transport Measurements

Energy Gaps of the Fractional Quantum Hall Effect Measured by Magneto-Optics

1992 ◽  
Vol 18 (1) ◽  
pp. 63-68 ◽  
Author(s):  
I. V Kukushkin ◽  
N. J Pulsford ◽  
K. von Klitzing ◽  
K Ploog ◽  
R. J Haug ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Fractional Quantum Hall Effect ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Energy Gaps

scholarly journals Observation of ballistic upstream modes at fractional quantum Hall edges of graphene

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Ravi Kumar ◽  
Saurabh Kumar Srivastav ◽  
Christian Spånslätt ◽  
K. Watanabe ◽  
T. Taniguchi ◽  
...  
Keyword(s):  
Energy Transport ◽  
Current Flow ◽  
Quantum Hall ◽  
Excess Noise ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Upstream Direction ◽  
Noise Measurements ◽  
Graphene Devices ◽  
Dc Current

AbstractThe presence of “upstream” modes, moving against the direction of charge current flow in the fractional quantum Hall (FQH) phases, is critical for the emergence of renormalized modes with exotic quantum statistics. Detection of excess noise at the edge is a smoking gun for the presence of upstream modes. Here, we report noise measurements at the edges of FQH states realized in dual graphite-gated bilayer graphene devices. A noiseless dc current is injected at one of the edge contacts, and the noise generated at contacts at length, L = 4 μm and 10 μm away along the upstream direction is studied. For integer and particle-like FQH states, no detectable noise is measured. By contrast, for “hole-conjugate” FQH states, we detect a strong noise proportional to the injected current, unambiguously proving the existence of upstream modes. The noise magnitude remains independent of length, which matches our theoretical analysis demonstrating the ballistic nature of upstream energy transport, quite distinct from the diffusive propagation reported earlier in GaAs-based systems.

scholarly journals Fractional Quantum Hall Effect Energy Gaps: Role of Electron Layer Thickness

2021 ◽  
Vol 127 (5) ◽  
Author(s):  
K. A. Villegas Rosales ◽  
P. T. Madathil ◽  
Y. J. Chung ◽  
L. N. Pfeiffer ◽  
K. W. West ◽  
...  
Keyword(s):  
Hall Effect ◽  
Layer Thickness ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Fractional Quantum Hall Effect ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Energy Gaps ◽  
Electron Layer

Thermal Collapse of the Fractional-Quantum-Hall-Effect Energy Gaps

1993 ◽  
Vol 22 (4) ◽  
pp. 287-292 ◽  
Author(s):  
I. V Kukushkin ◽  
N. J Pulsford ◽  
K. von Klitzing ◽  
R. J Haug ◽  
K Ploog ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Fractional Quantum Hall Effect ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Energy Gaps
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