206 citations · 3.2k across the 95 of their papers we have counts for
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Stability of Bogoliubov Fermi Surfaces within BCS Theory
Ankita Bhattacharya, Carsten Timm
It has recently been realized that the gap nodes of multiband superconductors that break time-reversal symmetry generically take the form of Fermi surfaces of Bogoliubov quasiparti…
Majorana flat bands at structured surfaces of nodal noncentrosymmetric superconductors
Clara J. Lapp, Carsten Timm
Surfaces of nodal noncentrosymmetric superconductors can host flat bands of Majorana modes, which provide a promising platform for quantum computation if one can find methods for m…
The effects of strain in multi-orbital superconductors: the case of SrRuO
Sophie Beck, Alexander Hampel, Manuel Zingl +2
Uniaxial strain experiments have become a powerful tool to unveil the character of unconventional phases of electronic matter. Here we propose a combination of the superconducting…
Bogoliubov Fermi surfaces from pairing of emergent fermions on the pyrochlore lattice
Shingo Kobayashi, Ankita Bhattacharya, Carsten Timm +1
We examine the appearance of superconductivity in the strong-coupling limit of the Hubbard model on the pyrochlore lattice. We focus upon the limit of half filling, where the norma…
Symmetry, nodal structure, and Bogoliubov Fermi surfaces for nonlocal pairing
Carsten Timm, Ankita Bhattacharya
Multiband effects can lead to fundamentally different electronic behavior of solids, as exemplified by the possible emergence of Fermi surfaces of Bogoliubov quasiparticles in cent…
Distortional weak-coupling instability of Bogoliubov Fermi surfaces
Carsten Timm, P. M. R. Brydon, Daniel F. Agterberg
Centrosymmetric multiband superconductors which break time-reversal symmetry generically have two-dimensional nodes, i.e., Fermi surfaces of Bogoliubov quasiparticles. We show that…
Stabilizing Even-Parity Chiral Superconductivity in SrRuO
Han Gyeol Suh, Henri Menke, P. M. R. Brydon +3
Strontium ruthenate (SrRuO) has long been thought to host a spin-triplet chiral -wave superconducting state. However, the singletlike response observed in recent spin-su…
Experimental consequences of Bogoliubov Fermi surfaces
Clara J. Lapp, Georg Börner, Carsten Timm
Superconductors involving electrons with internal degrees of freedom beyond spin can have internally anisotropic pairing states that are impossible in single-band superconductors.…
Bogoliubov Fermi surfaces: General theory, magnetic order, and topology
P. M. R. Brydon, D. F. Agterberg, Henri Menke +1
We present a comprehensive theory for Bogoliubov Fermi surfaces in inversion-symmetric superconductors which break time-reversal symmetry. A requirement for such a gap structure is…
Inflated nodes and surface states in superconducting half-Heusler compounds
C. Timm, A. P. Schnyder, D. F. Agterberg +1
Two topics of high current interest in the field of unconventional superconductivity are non-centrosymmetric superconductors and multiband superconductivity. Half-Heusler supercond…
Surface instability in nodal noncentrosymmetric superconductors
Carsten Timm, Stefan Rex, P. M. R. Brydon
We study the stability of topologically protected zero-energy flat bands at the surface of nodal noncentrosymmetric superconductors, accounting for the alteration of the gap near t…
Helical spin texture of surface states in topological superconductors
P. M. R. Brydon, Andreas P. Schnyder, Carsten Timm
Surface states of topological noncentrosymmetric superconductors exhibit intricate helical spin textures, i.e., the spin orientation of the surface quasiparticles is coupled to the…
Superconducting pairing in the spin-density-wave phase of iron pnictides
Jacob Schmiedt, P. M. R. Brydon, Carsten Timm
Some of the iron pnictides show coexisting superconductivity and spin-density-wave order. We study the superconducting pairing instability in the spin-density-wave phase. Assuming…
Interface currents in topological superconductor-ferromagnet heterostructures
P. M. R. Brydon, Carsten Timm, Andreas P. Schnyder
We propose the existence of a substantial charge current parallel to the interface between a noncentrosymmetric superconductor and a metallic ferromagnet. Our analysis focuses upon…
Edge currents as a signature of flat bands in topological superconductors
Andreas P. Schnyder, Carsten Timm, P. M. R. Brydon
We study nondegenerate flat bands at the surfaces of noncentrosymmetric topological superconductors by exact diagonalization of Bogoliubov-de Gennes Hamiltonians. We show that thes…
Types of topological surface states in nodal noncentrosymmetric superconductors
Andreas P. Schnyder, P. M. R. Brydon, Carsten Timm
Nodal noncentrosymmetric superconductors have topologically nontrivial properties manifested by protected zero-energy surface states. Specifically, it was recently found that zero-…
Josephson effect between triplet superconductors through a ferromagnetic barrier of finite width
Bogusz Bujnowski, Carsten Timm, P. M. R. Brydon
Charge and spin transport in a junction involving two triplet superconductors and a ferromagnetic barrier are studied. We use Bogoliubov-de Gennes wavefunctions to construct the Gr…
Microscopically derived Ginzburg-Landau theory for magnetic order in the iron pnictides
P. M. R. Brydon, Jacob Schmiedt, Carsten Timm
We examine the competition of the observed stripe spin density wave (SDW) with other commensurate and incommensurate SDW phases in a two-band model of the pnictides. Starting from…
Microscopic co-existence of superconductivity and magnetism in Ba1-xKxFe2As2
Erwin Wiesenmayer, Hubertus Luetkens, Gwendolyne Pascua +6
It is widely believed that, in contrast to its electron doped counterparts, the hole doped compound Ba1-xKxFe2As2 exhibits a mesoscopic phase separation of magnetism and supercondu…
Doping dependence of antiferromagnetism in models of the pnictides
Jacob Schmiedt, P. M. R. Brydon, Carsten Timm
We study the doping dependence of the spin-density-wave (SDW) state in four models of the 1111 pnictides. The random-phase approximation is used to determine the ordering temperatu…
Effect of intraband Coulomb repulsion on the excitonic spin-density wave
Björn Zocher, Carsten Timm, P. M. R. Brydon
We present a study of the magnetic ground state of a two-band model with nested electron and hole Fermi surfaces and both interband and intraband Coulomb interactions. Our aim is t…
Topologically protected flat zero-energy surface bands in non-centrosymmetric superconductors
P. M. R. Brydon, Andreas P. Schnyder, Carsten Timm
Nodal non-centrosymmetric superconductors (NCS) have recently been shown to be topologically non-trivial. An important consequence is the existence of topologically protected flat…
Spin Josephson effect with a single superconductor
P. M. R. Brydon, Yasuhiro Asano, Carsten Timm
A thin ferromagnetic layer on a bulk equal-spin-pairing triplet superconductor is shown to mediate a Josephson coupling between the spin and condensates of…
Andreev spectroscopy and surface density of states for a three-dimensional time-reversal invariant topological superconductor
Andreas P. Schnyder, P. M. R. Brydon, Dirk Manske +1
A topological superconductor is a fully gapped superconductor that exhibits exotic zero-energy Andreev surface states at interfaces with a normal metal. In this paper we investigat…