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Paired phases and Bose-Einstein condensation of spin-one bosons with attractive interaction
G. Pelka, K. Byczuk, J. Tworzydlo
We analyze paired phases of cold bosonic atoms with the hyper spin S=1 and with an attractive interaction. We derive mean-field self-consistent equations for the matrix order param…
Effective mass and tricritical point for lattice fermions localized by a random mass
M. V. Medvedyeva, J. Tworzydło, C. W. J. Beenakker
This is a numerical study of quasiparticle localization in symmetry class \textit{BD} (realized, for example, in chiral \textit{p}-wave superconductors), by means of a staggered-fe…
Absence of a metallic phase in charge-neutral graphene with a random gap
J. H. Bardarson, M. V. Medvedyeva, J. Tworzydlo +2
It is known that fluctuations in the electrostatic potential allow for metallic conduction (nonzero conductivity in the limit of an infinite system) if the carriers form a single s…
Majorana bound states without vortices in topological superconductors with electrostatic defects
M. Wimmer, A. R. Akhmerov, M. V. Medvedyeva +2
Vortices in two-dimensional superconductors with broken time-reversal and spin-rotation symmetry can bind states at zero excitation energy. These socalled Majorana bound states tra…