| Real-space imaging of fractional quantum Hall liquids. | |
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MedLine Citation:
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PMID: 23202473 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Electrons in semiconductors usually behave like a gas-as independent particles. However, when confined to two dimensions under a perpendicular magnetic field at low temperatures, they condense into an incompressible quantum liquid. This phenomenon, known as the fractional quantum Hall (FQH) effect, is a quantum-mechanical manifestation of the macroscopic behaviour of correlated electrons that arises when the Landau-level filling factor is a rational fraction. However, the diverse microscopic interactions responsible for its emergence have been hidden by its universality and macroscopic nature. Here, we report real-space imaging of FQH liquids, achieved with polarization-sensitive scanning optical microscopy using trions (charged excitons) as a local probe for electron spin polarization. When the FQH ground state is spin-polarized, the triplet/singlet intensity map exhibits a spatial pattern that mirrors the intrinsic disorder potential, which is interpreted as a mapping of compressible and incompressible electron liquids. In contrast, when FQH ground states with different spin polarization coexist, domain structures with spontaneous quasi-long-range order emerge, which can be reproduced remarkably well from the disorder patterns using a two-dimensional random-field Ising model. Our results constitute the first reported real-space observation of quantum liquids in a class of broken symmetry state known as the quantum Hall ferromagnet. |
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Authors:
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Junichiro Hayakawa; Koji Muraki; Go Yusa |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-12-02 |
Journal Detail:
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Title: Nature nanotechnology Volume: - ISSN: 1748-3395 ISO Abbreviation: Nat Nanotechnol Publication Date: 2012 Dec |
Date Detail:
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Created Date: 2012-12-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101283273 Medline TA: Nat Nanotechnol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Physics, Tohoku University, Sendai 980-8578, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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