Magnetization of mesoscopic copper rings: Evidence for persistent currents

Lévy, Laurent; Dolan, G. J.; Dunsmuir, J. H.; Bouchiat, H.

doi:10.1103/physrevlett.64.2074

Cited by 998 publications

(896 citation statements)

References 16 publications

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“…The effect has inspired numerous applications in solid state physics [2]. In particular we mention extensive theoretical and experimental research on persistent currents in mesoscopic rings [3,4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Electron interference in mesoscopic devices in the presence of nonclassical electromagnetic fields

Tsomokos

Chong

Vourdas

2005

J. Opt. B: Quantum Semiclass. Opt.

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Abstract. The interaction of mesoscopic interference devices with nonclassical electromagnetic fields is studied. The external quantum fields induce a phase factor on the electric charges. This phase factor, which is a generalization of the standard Aharonov-Bohm phase factor, is in the case of nonclassical electromagnetic fields a quantum mechanical operator. Its expectation value depends on the density matrix describing the nonclassical photons and determines the interference. Several examples are discussed, which show that the quantum noise of the nonclassical photons destroys slightly the electron interference fringes. An interesting application arises in the context of distant electron interference devices, irradiated with entangled photons. In this case the interfering electrons in the two devices become entangled. The same ideas are applied in the context of SQUID rings irradiated with nonclassical electromagnetic fields. It is shown that the statistics of the Cooper pairs tunneling through the Josephson junction depend on the statistics of the photons.

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Section: Introductionmentioning

confidence: 99%

Electron interference in mesoscopic devices in the presence of nonclassical electromagnetic fields

Tsomokos

Chong

Vourdas

2005

J. Opt. B: Quantum Semiclass. Opt.

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“…Normal-metal phase-coherent rings exhibit persistent currents because of electron interference [5,6,11]. The presence of an Aharonov-Bohm flux Φ introduces a phase factor into the boundary condition for the electron wave function,…”

Section: τ φ From Dissipative Persistent Currentmentioning

confidence: 99%

“…Coherence of the quantum wave function is manifestly present in interference phenomena, which arise because of the linear superposition of wave functions corresponding to various alternatives in the evolution of the system [1]. In condensed matter physics, electrons inside the low-dimensional conductors behave quantum mechanically, very much like the photons or the electrons in a double-slit experiment [2][3][4][5]. The quantum mechanical behaviour appears because electrons in lowdimensional structures at low temperature can maintain phase coherence over long times, while traversing the entire length of the structure.…”

Section: Introductionmentioning

confidence: 99%

Of Decoherent Electrons and Disordered Conductors

Mohanty

2002

Complexity From Microscopic to Macroscopic Scales: Coherence and Large Deviations

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Abstract:Electron decoherence at low temperatures is important for the proper understanding of the metallic ground state, usually studied within the framework of Fermi liquid theory. It is also fundamental to various insulating transitions in low-dimensional disordered conductors, such as Anderson localization, which similar to the Fermi liquid theory relies on a vanishing decoherence rate at zero temperature. I review a series of interference experiments designed to study decoherence by a variety of intrinsic and extrinsic mechanisms. The goal is to determine if there is a truly intrinsicand, in a sense, unavoidable-source of decoherence, coming from electronelectron interaction. In recent experiments we find that the saturation is not due to any mechanism involving magnetic impurities*. The interference experiments do indicate that there is an ultimate source of decoherence even at zero temperature.

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“…This effect originates from the periodic dependence of the phase of the electron wave function on the magnetic flux through the ring, the Aharonov-Bohm effect, 1 and is usually associated with the occurrence of persistent currents in the ring. [2][3][4][5] The first experimental evidence of Aharonov-Bohm oscillations was found in metallic 6,7 and semiconductor 8 rings in the mesoscopic regime. In recent years, the fabrication and the investigation of In x Ga 1−x As self-assembled quantum rings ͑SAQRs͒ have been rapidly progressing and led to a large number of experimental [9][10][11][12][13][14] and theoretical [15][16][17][18] studies.…”

Section: Introductionmentioning

confidence: 99%

Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembledInxGa1−xAsquantum rings in GaAs

et al. 2007

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Citation for published version (APA):Fomin, V. M., Gladilin, V. N., Klimin, S. N., Devreese, J. T., Kleemans, N. A. J. M., & Koenraad, P. M. (2007). Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembled Inx Ga1-x As quantum rings in GaAs. Physical Review B, 76(23) Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal. Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembled In x Ga 1−x As quantum rings in GaAs We analyze theoretically the electron energy spectrum and the magnetization of an electron in a strained In x Ga 1−x As/ GaAs self-assembled quantum ring ͑SAQR͒ with realistic parameters, determined from the crosssectional scanning-tunneling microscopy characterization of that nanostructure. The SAQRs have an asymmetric indium-rich craterlike shape with a depression rather than an opening at the center. Although the real SAQR shape differs strongly from an idealized circular-symmetric open ring structure, the Aharonov-Bohm oscillations of the magnetization survive.

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Magnetization of mesoscopic copper rings: Evidence for persistent currents

Cited by 998 publications

References 16 publications

Electron interference in mesoscopic devices in the presence of nonclassical electromagnetic fields

Electron interference in mesoscopic devices in the presence of nonclassical electromagnetic fields

Of Decoherent Electrons and Disordered Conductors

Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembledInxGa1−xAsquantum rings in GaAs

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