Aharonov-Bohm Effect on Charge Density Wave (CDW) Moving through Columnar Defects in NbS<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Latyshev, Yu. I.; Laborde, O.; Monçeau, P.; Klaumünzer, S.

doi:10.1103/physrevlett.78.919

Cited by 71 publications

(64 citation statements)

References 8 publications

(11 reference statements)

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“…Hence the quasi-particle will not travel over several nanometers, and the coherence of a quasi-particle is unlikely to 4 be preserved over the whole system with the circumference of 85 µm at 79 K. The phase correlation length of sliding CDW is longer than quasi-particle and the circumference of our sample because sliding CDW becomes more ordered in the direction of motion [22]. In case of our sample, the possibility of A'tsuler-Aronov-Spivak effect [18], namely h/2e oscillation of a quasi-particle, is ruled out.…”

Section: Methodsmentioning

confidence: 91%

“…The period of the oscillation ∆B is 39.7 mGauss for all voltages. By assuming the origin of the oscillation to the AB effect [1,3,18], we estimated the effective charge e * using the following formula, show the sinusoidal oscillation with the period and amplitude corresponding to the peak of the power spectra. The major contribution of the observed oscillations is well expressed by the obtained spectra.…”

Section: Methodsmentioning

confidence: 99%

“…Latyshev et al tried to observe the AB effect of CDWs in NbSe 3 crystals with tiny random holes pierced by heavy-ion irradiation [18]. Oscillation in the nonlinear CDW conductivity as a function of the magnetic field was shown.…”

Section: Introductionmentioning

confidence: 99%

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Aharonov-Bohm effect in charge-density wave loops with inherent temporal current switching

Tsubota¹,

Inagaki²,

Matsuura³

et al. 2012

EPL

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The Aharonov-Bohm (AB) effect has been accepted and has promoted interdisciplinary scientific activities in modern physics. To observe the AB effect in condensed matter physics, the whole system needs to maintain phase coherence, in a tiny ring of the diameter 1 µm and at low temperatures below 1 K. We report that AB oscillations have been measured at high temperature 79 K by use of charge-density wave (CDW) loops in TaS 3 ring crystals. CDW condensate maintained macroscopic quantum coherence, which extended over the ring circumference 85 µm. The periodicity of the oscillations is h/2e in accuracy within a 10 % range. The observation of the CDW AB effect implies Frohlich superconductivity in terms of macroscopic coherence and will provide a novel quantum interference device running at room temperature.

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Section: Methodsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Aharonov-Bohm effect in charge-density wave loops with inherent temporal current switching

Tsubota¹,

Inagaki²,

Matsuura³

et al. 2012

EPL

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“…Aspects of the Aharonov-Bohm persistent currents in complex and correlated systems have been considered in various papers, in particular by studying the strong coupling 24 -26 and localization 27,28 effects, thermodynamicstatistical properties, [29][30][31] polaron effects, 32,33 effects of strong magnetic field 34,35 and spin-orbit interaction, 36 Peierls transition, [38][39][40] Wigner crystallization 41 and Coulomb blockade, 42 persistent current oscillation in hollow cylinders with toroidal geometry, 43 nonequilibrium and timedependent effects, 44 -48 weak links in the loop, 49 as well as the nontraditional phase effects ͑geometrical and Berry's phase, instantons, etc.͒ 50-53 summarized in recent reviews. 14,54 -57 Further trends in the macromolecular persistent and spontaneous currents [58][59][60] include quantum computational 61 prospects of using Aharonov-Bohm loops as quantum bits ͑qubits͒ with the advantages of easier ͑radiation-free͒ manipulation of qubit states and increased decoherence times as compared to macroscopic ''Schrö-dinger cat'' structures ͑Josephson junctions͒.…”

Section: Persistent Currents In Mesoscopic Systemsmentioning

confidence: 99%

Spontaneous and persistent currents in superconductive and mesoscopic structures (Review)

Kulik

2004

Low Temperature Physics

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We briefly review aspects of superconductive persistent currents in Josephson junctions of the S/I/S, S/O/S and S/N/S types, focusing on the origin of jumps in the current versus phase dependences, and discuss in more detail the persistent and the "spontaneous" currents in Aharonov-Bohm mesoscopic and nanoscopic (macromolecular) structures. A fixed-number-of-electrons mesoscopic or macromolecular conducting ring is shown to be unstable against structural transformation removing spatial symmetry (in particular, azimuthal periodicity) of its electron-lattice Hamiltonian. In the case when the transformation is blocked by strong coupling to an external azimuthally symmetric environment, the system becomes bistable in its electronic configuration at a certain number of electrons. Under such a condition, the persistent current has a nonzero value even at an (almost) zero applied Aharonov-Bohm flux and results in very high magnetic susceptibility dM/dH at small nonzero fields, followed by an oscillatory dependence at larger fields. We tentatively assume that previously observed oscillatory magnetization in cyclic metallo-organic molecules by Gatteschi et al. can be attributed to persistent currents. If this proves correct, it may present an opportunity for (and, more generally, macromolecular cyclic structures may suggest the possibility of) engineering quantum computational tools based on the Aharonov-Bohm effect in ballistic nanostructures and macromolecular cyclic aggregates. © 2004 American Institute of Physics

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“…3,4 As the length scale for mesoscopic phenomena is on the order of microns in the longitudinal direction, it is essential to reduce contact spacings to this scale. Since both types of lateral contacts mentioned above apply current in the transverse direction, a region of nonuniform electric field exists in the vicinity of current contacts.…”

mentioning

confidence: 99%

Electric-field distribution near current contacts of anisotropic materials

2001

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We have measured the nonuniformity of the electric field near lateral current contacts of the charge-densitywave materials NbSe 3 and o-TaS 3 . In this contact geometry, the electric field increases considerably near a current contact. Fitting our data to an existing model yields values for the conduction anisotropy and a characteristic longitudinal length scale. This length scale is on the same order as the mesoscopic phenomena in charge-density-wave devices. DOI: 10.1103/PhysRevB.65.033403 PACS number͑s͒: 71.45.Lr, 72.15.Nj Anisotropic conductors with a chainlike structure can undergo a phase transition to a charge-density-wave ͑CDW͒ state.1 Electrons condense into a collective state in which the charge density is periodically modulated. The CDW can slide through the crystal under the application of an electric field. However, defects in the crystal lattice pin the CDW at low fields and a threshold has to be overcome. The experimental study of CDW dynamics usually involves transport measurement along the chain direction. Electrical contact is most often made by connecting metal electrodes to the crystal at various positions on the top or bottom side ͑face͒ of the crystal 2 or, more recently, by etching side contacts in the crystal itself.3 Most transport studies have been performed on samples with contact spacings of 10 m and larger.Recently, interest has grown to study the mesoscopic CDW regime.3,4 As the length scale for mesoscopic phenomena is on the order of microns in the longitudinal direction, it is essential to reduce contact spacings to this scale. Since both types of lateral contacts mentioned above apply current in the transverse direction, a region of nonuniform electric field exists in the vicinity of current contacts. This nonuniformity is known under the name ''fringing effects.'' In previous experiments so far, measurements of fringing effects were limited by perturbing contacts and large contact separation.In case of anisotropic materials, fringing effects are particularly pronounced. In such materials, the length scale over which fringing effects are important is ͱA times larger than in the isotropic case. Here, A is the anisotropy, which is the ratio of the conductivity along and perpendicular to the crystal length.We have measured the electric field distribution on submicron length scales in the longitudinal direction. We find good agreement with existing models which indicate that fringing effects are important up to distances of tͱA from the current contact, where t is the crystal thickness. From our data, we can deduce the corresponding A. We find it to be ϳ100 for NbSe 3 and ϳ1000 for o-TaS 3 at Tϭ120 K. This is the first measurement of A in the crystallographic a axis of NbSe 3 . Our measurements are performed in the pinned state, so that our data concerns geometrical effects only, and does not explore the complicated current dependent field profiles that develop when the CDW depins. 5,6 Experiments are performed on crystals of NbSe 3 and o-TaS 3 . Both materials have an anisotropi...

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Aharonov-Bohm Effect on Charge Density Wave (CDW) Moving through Columnar Defects in NbSe3

Cited by 71 publications

References 8 publications

Aharonov-Bohm effect in charge-density wave loops with inherent temporal current switching

Aharonov-Bohm effect in charge-density wave loops with inherent temporal current switching

Spontaneous and persistent currents in superconductive and mesoscopic structures (Review)

Electric-field distribution near current contacts of anisotropic materials

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