Collective dynamics of Josephson fluxons in Bi2Sr2CaCu2O8+δ intrinsic junctions

Chang, Dong-In; Bae, Myung‐Ho; Chang, Hyuk; Lee, Hu-Jong; Kim, Jinhee; Woo, Byung-Chill; Oda, Masahiro

doi:10.1016/s0921-4534(02)01886-5

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…A summary of the inclusion of various systematic errors is detailed in Ref. [7,8]. We perform a combined chiralcontinuum extrapolation over the entire data set and obtain the matrix elements at the physical point [10], as illustrated in Fig.…”

Section: Lattice Calculationmentioning

confidence: 99%

Short-distance matrix elements for $D$-meson mixing for 2+1 lattice QCD

Chang

2015

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Neutral-meson mixing is loop suppressed in the Standard Model, leading to the possibility of enhanced sensitivity to new physics. The uncertainty in Standard Model predictions for B-meson oscillation frequencies is dominated by theoretical uncertainties within the short-distance B-meson hadronic matrix elements, motivating the need for improved precision. In D-meson mixing, the Standard Model short-distance contributions are further suppressed by the GIM mechanism allowing for the possibility of large new physics enhancements. A first-principle determination of the D-meson short-distance hadronic matrix elements will allow for modeldiscrimination between the new physics theories. I review recently published and ongoing lattice calculations of hadronic matrix elements in B and D-meson mixing with emphasis on the Fermilab lattice and MILC collaboration effort on the determination of the B and D-meson mixing hadronic matrix elements using the methods of lattice QCD. PRESENTED AT CIPANP2015

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Section: Lattice Calculationmentioning

confidence: 99%

Short-distance matrix elements for $D$-meson mixing for 2+1 lattice QCD

Chang

2015

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“…In an IJJ, since the superconductor-layer thickness, t, is much smaller than the magnetic penetration length, a magnetic field (in units of T) for generating one fluxon in a finite length, L, of each junction is roughly given by 0 /((d + t)L) [13], where d is the insulator thickness and d + t is the periodicity of the IJJs, that is 1.5 nm for Bi 2 Sr 2 CaCu 2 O x . For a typical size of L = 1 μm, the magnetic field required to generate a fluxon is as large as 1 T. In fact, the magnetic fields appearing in many papers that discuss magnetic field dependence of critical currents, flux-flow propagation, and flux-cavity resonance are more than 1 T [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Low-magnetic-field operations of intrinsic Josephson junctions with a longc-axis periodicity by artificial critical-current modulations

Sakai¹,

Zhao

2006

Supercond. Sci. Technol.

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Flux-flow cavity resonances in intrinsic Josephson junctions (IJJs) with long c-axis periodicity by artificial critical-current (Jc) modulation are studied numerically and theoretically. For an n-1–n-1–n-1–n IJJ system with n-layer high-Jc and one-layer low-Jc alternately stacked, numerical simulation confirms fluxon penetration only in the low-Jc junctions under proper low magnetic fields. The simulation also shows pronounced cavity-resonance steps in the I–V curves of the low-Jc junctions, meaning that fluxon dynamics can be generated under much lower magnetic fields, compared to the fields for usual IJJs with homogeneous Jc. A theoretical method for describing the flux-flow cavity-resonance properties is presented. The general disperse k–ω relationship shows that, at low-k regions, the critical-current-modulated junction system can be regarded as simple homogeneous stacked junctions with a new effective thickness and a new inductive coupling strength. For general-k cases, the cavity-resonant voltage steps on the I–V curves at various magnetic fields can be well indexed by integers, which means excellent agreement between the theoretical analysis and the numerical simulations.

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