Dielectric resonator method for determining gap symmetry of superconductors through anisotropic nonlinear Meissner effect

Bae, Seokjin; Tan, Yuewen; Zhuravel, A. P.; Zhang, Lingchao; Zeng, Shengwei; Liu, Yong; Lograsso, Thomas A.; Ariando, Ariando; Venkatesan, T.; Anlage, Steven M.

doi:10.1063/1.5090130

Cited by 12 publications

(5 citation statements)

References 71 publications

(116 reference statements)

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“…An alternative approach that can reveal the symmetry change of superconducting correlations is the Meissner effect. This method may provide a clear and direct image of the symmetry change discussed above 57 .…”

Section: Model and Resultsmentioning

confidence: 99%

Control of superconducting pairing symmetries in monolayer black phosphorus

2019

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Motivated by recent experimental progress, we study the effect of mechanical deformations on the superconducting pairing symmetries in monolayer black phosphorus (MBP). Starting with phonon-mediated intervalley spin-singlet electron-electron pairing and making use of realistic band parameters obtained through firstprinciples calculations, we show that the application of weak mechanical strain in the plane of MBP can change the effective s-wave and p-wave symmetry of the superconducting correlations into effective d-wave and fwave symmetries, respectively. This prediction of a change in the pairing symmetries might be experimentally confirmed through angular dependence high-resolution tunneling spectroscopy, the Meissner effect, and critical temperature experiments. The idea of manipulating the superconducting symmetry class by applying planar mechanical strain can be extended to other anisotropic materials as well, and may help in providing important information of the symmetries of the order parameter, perhaps even in some high-Tc superconductors.

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Section: Model and Resultsmentioning

confidence: 99%

Control of superconducting pairing symmetries in monolayer black phosphorus

2019

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“…Therefore, one should be able to distinguish between angle-independent and angle-dependent symmetry classes. Another method that might be utilized in investigating the change in the symmetry profile of superconducting correlations discussed above is nonlinear Meissner effect to image the symmetry profile of pairing correlations 58 .…”

Section: Aa Stacking Order: Phonon-mediated Intralayer and Interlayermentioning

confidence: 99%

Symmetry of superconducting correlations in displaced bilayers of graphene

2019

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Using a Green's function approach, we study phonon-mediated superconducting pairing symmetries that may arise in bilayer graphene where the monolayers are displaced in-plane with respect to each other. We consider a generic coupling potential between the displaced graphene monolayers, which is applicable to both shifted and commensurate twisted graphene layers; study intralayer and interlayer phonon-mediated BCS pairings; and investigate AA and AB(AC) stacking orders. Our findings demonstrate that at the charge neutrality point, the dominant pairings in both AA and AB stackings with intralayer and interlayer electron-electron couplings can have even-parity s-wave class and odd-parity p-wave class of symmetries with the possibility of invoking equal-pseudospin and odd-frequency pair correlations. At a finite doping, however, the AB (and equivalently AC) stacking can develop pseudospin-singlet and pseudospin-triplet d-wave symmetry, in addition to s-wave, p-wave, f -wave, and their combinations, while the AA stacking order, similar to the undoped case, is unable to host the d-wave symmetry. When we introduce a generic coupling potential, applicable to commensurate twisted and shifted bilayers of graphene, d-wave symmetry can also appear at the charge neutrality point. Inspired by a recent experiment where two phonon modes were observed in a twisted bilayer graphene, we also discuss the possibility of the existence of two-gap superconductivity, where the intralayer and interlayer phonon-mediated BCS picture is responsible for superconductivity. These analyses may provide a useful tool in determining the superconducting pairing symmetries and mechanism in bilayer graphene systems.

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“…43,45,66 The comprehensive details of the dielectric resonator used in this work can be found in Ref. 44 Here, a summary of the key features is introduced for the reader's convenience. The resonator consists of a top and bottom metallic plate which confine the microwave field inside the resonator just as in a cavity ( Fig.…”

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confidence: 99%

Microwave Meissner screening properties of proximity-coupled topological-insulator / superconductor bilayers

Bae¹,

Lee²,

Zhang³

et al. 2019

Phys. Rev. Materials

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The proximity coupled topological insulator / superconductor (TI/SC) bilayer system is a representative system to realize topological superconductivity. In order to better understand this unique state and design devices from the TI/SC bilayer, a comprehensive understanding of the microscopic properties of the bilayer is required. In this work, a microwave Meissner screening study, which exploits a high-precision microwave resonator technique, is conducted on the SmB6/YB6 thin film bilayers as an example TI/SC system. The study reveals spatially dependent electrodynamic screening response of the TI/SC system that is not accessible to other techniques, from which the corresponding microscopic properties of a TI/SC bilayer can be obtained. The TI thickness dependence of the effective penetration depth suggests the existence of a bulk insulating region in the TI layer. The spatially dependent electrodynamic screening model analysis provides an estimate for the characteristic lengths of the TI/SC bilayer: normal penetration depth, normal coherence length, and the thickness of the surface states. We also discuss implications of these characteristic lengths on the design of a vortex Majorana device such as the radius of the vortex core, the energy splitting due to intervortex tunneling, and the minimum thickness required for a device. arXiv:1904.06620v2 [cond-mat.supr-con]

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Dielectric resonator method for determining gap symmetry of superconductors through anisotropic nonlinear Meissner effect

Cited by 12 publications

References 71 publications

Control of superconducting pairing symmetries in monolayer black phosphorus

Control of superconducting pairing symmetries in monolayer black phosphorus

Symmetry of superconducting correlations in displaced bilayers of graphene

Microwave Meissner screening properties of proximity-coupled topological-insulator / superconductor bilayers

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