Ballistic transport in one-dimensional random dimer photonic crystals

Abstract

The low-field magnetic response of the non-centrosymmetric superconductor YPtBi (T c = 0.77 K) is investigated. Ac-susceptibility and dc-magnetization measurements provide solid evidence for bulk superconductivity with a volume fraction of ∼ 70 %. The lower critical field is surprisingly small: B c1 = 0.008 mT (T → 0). Muon spin rotation experiments in a transverse magnetic field of 0.01 T show a weak increase of the Gaussian damping rate σ T F below T c , which yields a London penetration depth λ = 1.6 ± 0.2 µm. The zero-field Kubo-Toyabe relaxation rate σ KT equals 0.129 ± 0.004 µs −1 and does not show a significant change below T c . This puts an upper bound of 0.04 mT on the spontaneous magnetic field associated with a possible odd-parity component in the superconducting order parameter.

Extended states in random dimer gated graphene superlattices

“…Evidence of the suppression of the electron localization by means of two type of extended states was found. In the same way that in SSLs, the dimer-type correlation has been applied to the propagation of mechanical [17], acoustic [18], and optical [19,20] waves in random media.…”