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Non-equilibrium edge-channel spectroscopy in the integer quantum Hall regime
- Source :
- Nature Physics, Nature Physics, Nature Publishing Group, 2010, 6 (1), pp.34-39. ⟨10.1038/nphys1429⟩
- Publication Year :
- 2009
- Publisher :
- Springer Science and Business Media LLC, 2009.
-
Abstract
- Heat transport has large potentialities to unveil new physics in mesoscopic systems. A striking illustration is the integer quantum Hall regime, where the robustness of Hall currents limits information accessible from charge transport. Consequently, the gapless edge excitations are incompletely understood. The effective edge states theory describes them as prototypal one-dimensional chiral fermions - a simple picture that explains a large body of observations and calls for quantum information experiments with quantum point contacts in the role of beam splitters. However, it is in ostensible disagreement with the prevailing theoretical framework that predicts, in most situations, additional gapless edge modes. Here, we present a setup which gives access to the energy distribution, and consequently to the energy current, in an edge channel brought out-of-equilibrium. This provides a stringent test of whether the additional states capture part of the injected energy. Our results show it is not the case and thereby demonstrate regarding energy transport, the quantum optics analogy of quantum point contacts and beam splitters. Beyond the quantum Hall regime, this novel spectroscopy technique opens a new window for heat transport and out-of-equilibrium experiments.<br />Comment: 13 pages including supplementary information, Nature Physics in print
- Subjects :
- FOS: Physical sciences
General Physics and Astronomy
02 engineering and technology
Quantum Hall effect
Edge (geometry)
01 natural sciences
Gapless playback
Quantum spin Hall effect
Quantum mechanics
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
010306 general physics
Spectroscopy
ComputingMilieux_MISCELLANEOUS
[PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]
[PHYS]Physics [physics]
Physics
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed matter physics
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
021001 nanoscience & nanotechnology
3. Good health
Flow (mathematics)
0210 nano-technology
Energy (signal processing)
Integer (computer science)
Subjects
Details
- ISSN :
- 17452481, 17452473, and 14764636
- Volume :
- 6
- Database :
- OpenAIRE
- Journal :
- Nature Physics
- Accession number :
- edsair.doi.dedup.....e7a3143574d408fa3f558cdcfc0bbdbd