From Majorana Theory of Atomic Autoionization to Feshbach Resonances in High Temperature Superconductors

Vittorini-Orgeas, Alessandra; Bianconi, A.

doi:10.1007/s10948-008-0433-x

Cited by 36 publications

(32 citation statements)

References 53 publications

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“…It is physically due to the interference between a background and a resonant scattering process. This effect is named after Ugo Fano who offered a beautiful theoretical explanation on the scattering lineshape of inelastic scattering of electrons in helium [35] (although some people credit Ettore Majorana for the first discovery of such a phenomenon [36]). Since it is a general wave phenomenon, a variety of examples can be found across many research areas of physics and engineering.…”

Section: Fano Resonance In An Active Microcavitymentioning

confidence: 99%

Modeling of On-Chip Optical Nonreciprocity with an Active Microcavity

et al. 2015

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On-chip nonreciprocal light transport holds a great impact on optical information processing and communications based upon integrated photonic devices. By harvesting gain-saturation nonlinearity, we recently demonstrated on-chip optical asymmetric transmission at telecommunication bands with superior nonreciprocal performances using only one active whispering-gallery-mode microtoroid resonator, beyond the commonly adopted magneto-optical (Faraday) effect. Here, detailed theoretical analysis is presented with respect to the reported scheme. Despite the fact that our model is simply the standard coupled-mode theory, it agrees well with the experiment and describes the essential one-way light transport in this nonreciprocal device. Further discussions, including the connection with the second law of thermodynamics and Fano resonance, are also briefly made in the end.

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Section: Fano Resonance In An Active Microcavitymentioning

confidence: 99%

Modeling of On-Chip Optical Nonreciprocity with an Active Microcavity

et al. 2015

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“…The shape resonances in superconducting gaps near an ETT are analogous to the scattering resonances due to configuration interaction between a closed and an open channel described in nuclear physics by Majorana and Feshbach, and in atomic physics by Fano, as reported in a recent work. 42 In our system, we capture the crucial ingredients of the interplay of the two bands and of the two set of wave functions (which will be shown to be responsible for the shape resonances in the gap and in the critical temperature), without facing the complications beyond BCS theories (as the Eliashberg theory, or corrections beyond Migdal theorem, etc.) which are considered in more conventional (phonon-or magnon-mediated) strong-coupling superconductors, or the t-matrix corrections.…”

Section: Introductionmentioning

confidence: 99%

Resonant and crossover phenomena in a multiband superconductor: Tuning the chemical potential near a band edge

et al. 2010

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Resonances in the superconducting properties, in a regime of crossover from BCS to mixed Bose-Fermi superconductivity, are investigated in a two-band superconductor where the chemical potential is tuned near the band edge of the second miniband generated by quantum confinement effects. The shape resonances at T=0 in the superconducting gaps (belonging to the class of Feshbach-like resonances) is manifested by interference effects in the superconducting gap at the first large Fermi surface when the chemical potential is in the proximity of the band edge of the second miniband. The case of a superlattice of quantum wells is considered and the amplification of the superconducting gaps at the Lifshitz transition of the type neck-collapsing of Fermi surface topology is clearly shown. The results are found to be in good agreement with available experimental data on a superlattice of honeycomb boron layers intercalated by Al and Mg spacer layers

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“…[80] A similar scenario is possible in ultracold gases [81] since the shape resonance is a fundamental concept for many body systems in nuclear, atomic, molecular and condensed matter. [82] While the consensus on multiband superconductivity in the clean limit has been rapidly accepted for diborides and pnictides [44][45][46][47] condensates with different winding numbers. [80] In this work we describe the complex physics of two components superfluid condensates with two order parameters: the first is a standard BCS condensate and the second is a bosonic condensate near a band threshold.…”

Section: Introductionmentioning

confidence: 99%