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Interlayer coherence in Superconductor Bilayers
Igor V. Blinov, Allan H. MacDonald
We investigate the possibility and implications of interlayer coherence in electrically isolated superconducting bilayers. We find that in a mean-field approximation bilayers can h…
Functional Renormalization Group Study of Superconductivity in Rhombohedral Trilayer Graphene
Wei Qin, Chunli Huang, Tobias Wolf +3
We employ a functional renormalization group approach to ascertain the pairing mechanism and symmetry of the superconducting phase observed in rhombohedral trilayer graphene. Super…
Quantum Hall Superconductivity from Moir{é} Landau Levels
Gaurav Chaudhary, A. H. MacDonald, M. R. Norman
It has long been speculated that quasi-two-dimensional superconductivity can reappear above its semiclassical upper critical field due to Landau quantization, yet this reentrant pr…
Critical magnetic fields and electron-pairing in magic-angle twisted bilayer graphene
Wei Qin, Bo Zou, Allan H. MacDonald
The velocities of the quasiparticles that form Cooper pairs in a superconductor are revealed by the upper critical magnetic field. Here we use this property to assess superconducti…
PTCDA molecular monolayer on Pb thin films: An unusual π-electron Kondo system and its interplay with a quantum-confined superconductor
Shuangzan Lu, Hyoungdo Nam, Penghao Xiao +13
The hybridization of magnetism and superconductivity has been an intriguing playground for correlated electron systems, hosting various novel physical phenomena. Usually, localized…
Theory of phonon-mediated superconductivity in twisted bilayer graphene
Fengcheng Wu, A. H. MacDonald, Ivar Martin
We present a theory of phonon-mediated superconductivity in near magic angle twisted bilayer graphene. Using a microscopic model for phonon coupling to moiré band electrons, we fin…
Visualizing landscapes of the superconducting gap in heterogeneous superconductor thin films: geometric influences on proximity effects
Jungdae Kim, Victor Chua, Gregory A. Fiete +3
The proximity effect is a central feature of superconducting junctions as it underlies many important applications in devices and can be exploited in the design of new systems with…
Universal Quenching of Superconductivity in Two-dimensional Nano-islands
Jungdae Kim, Gregory A. Fiete, Hyoungdo Nam +2
We systematically address superconductivity of Pb nano-islands with different thicknesses and lateral sizes via a scanning tunneling microscopy/spectroscopy. Reduction of the super…
Vortex Lattice Structure of Fulde-Ferrell-Larkin-Ovchinnikov Superconductors
Kun Yang, A. H. MacDonald
In superconductors with singlet pairing, the inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is expected to be stabilized by a large Zeeman splitting. We develop an eff…
Interactions suppress Quasiparticle Tunneling at Hall Bar Constrictions
Emiliano Papa, Allan. H. MacDonald
Tunneling of fractionally charged quasiparticles across a two-dimensional electron system on a fractional quantum Hall plateau is expected to be strongly enhanced at low temperatur…
Inhomogeneous order-parameter suppression in disordered d-wave superconductors
W. A. Atkinson, P. J. Hirschfeld, A. H. MacDonald
We report on a numerical study of disorder effects in 2D d-wave BCS superconductors. We compare exact numerical solutions of the Bogoliubov-deGennes (BdG) equations for the density…