Microwave Meissner Screening of Proximity coupled Topological Insulator / Superconductor Bilayers

Abstract

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 comment10 pages, 5 figures

References in corpus (36)

• Anyons in an exactly solved model and beyond
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Paired states of fermions in two dimensions with breaking of parity and time-reversal symmetries, and the fractional quantum Hall effect
• Observation of Majorana fermions with spin selective Andreev reflection in the vortex of topological superconductor
• Majorana mode in vortex core of Bi2Te3/NbSe2 topological insulator-superconductor heterostructure
• The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films
• Chiral Topological Superconductor From the Quantum Hall State
• Helical Metal Inside a Topological Band Insulator
• Magnetic Penetration Depth in Unconventional Superconductors
• Surface electronic structure of the topological Kondo insulator candidate correlated electron system SmB6
• Observation of in-gap surface states in the Kondo insulator SmB6 by photoemission
• Unconventional Fermi surface in an insulating state
• Topological Superconductor Bi2Te3/NbSe2 heterostructures
• Measurement of Resonant Frequency and Quality Factor of Microwave Resonators: Comparison of Methods
• Direct observation of the spin texture in strongly correlated SmB6 as evidence of the topological Kondo insulator
• Momentum space imaging of Cooper pairing in a half-Dirac-gas topological superconductor (a helical 2D topological superconductor)
• Tuning bulk and surface conduction in topological Kondo insulator SmB6
• Kondo Breakdown in Topological Kondo Insulators
• Energy gap, penetration depth and surface resistance of MgB2 thin films determined by microwave resonator mesurements
• Imaging emergent heavy Dirac fermions of a topological Kondo insulator
• Anomalous 3D bulk AC conduction within the Kondo gap of SmB${}_6$ single crystals
• Surface Theory of a Family of Topological Kondo Insulators
• Observation of perfect Andreev reflection due to Klein paradox in a topological superconducting state
• Proximity-effect-induced Superconducting Gap in Topological Surface States - A Point Contact Spectroscopy Study of NbSe2/Bi2Se3 Superconductor-Topological Insulator Heterostructures
• Diamagnetic Response of Normal-metal -- Superconductor Double Layers
• Majorana fermions in pinned vortices
• Robustness of the Insulating Bulk in the Topological Kondo Insulator SmB${}_6$
• Composition-spread Growth and the Robust Topological Surface State of Kondo insulator SmB6 Thin Films
• Bulk Fermi surface of charge-neutral excitations in SmB6 or not: a heat-transport study
• Lattice instability and enhancement of superconductivity in YB${}_6$
• Linear and nonlinear low frequency electrodynamics of the surface superconducting states in an yttrium hexaboride a single crystal
• Observation of the superconducting proximity effect in the surface state of SmB6 thin films
• Proximity Effect in Nb/Au/CoFe Trilayers
• Microscopic properties of vortex state in YB6 probed by muon spin rotation
• Ultrafast terahertz spectroscopy study of Kondo insulating thin film SmB${}_6$: evidence for an emergent surface state
• Dielectric Resonator Method For Determining Gap Symmetry Of Superconductors Through Anisotropic Nonlinear Meissner Effect

Cited by in corpus (3)

• Anomalous normal fluid response in a chiral superconductor UTe2
• Circuit QED detection of induced two-fold anisotropic pairing in a hybrid superconductor-ferromagnet bilayer
• Observation of the superconducting proximity effect from surface states in SmB${}_6$/YB${}_6$ thin film heterostructures via terahertz spectroscopy