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SU(2) approach to the pseudogap phase of high-temperature superconductors: electronic spectral functions
Samuel Bieri, Dmitri Ivanov
We use an SU(2) mean-field theory approach with input from variational wavefunctions of the t-J model to study the electronic spectra in the pseudogap phase of cuprates. In our mod…
Josephson current in a superconductor-ferromagnet junction with two non-collinear magnetic domains
B. Crouzy, S. Tollis, D. A. Ivanov
We study the Josephson effect in a superconductor--ferromagnet--superconductor (SFS) junction with ferromagnetic domains of non-collinear magnetization. As a model for our study we…
Minigap in superconductor-ferromagnet junctions with inhomogeneous magnetization
D. A. Ivanov, Ya. V. Fominov
We consider the minigap in a disordered ferromagnet (F) in contact with a superconductor (S) in the situation when the magnetization of the F layer is inhomogeneous in space and no…
Minigap in a SN junction with paramagnetic impurities
B. Crouzy, E. Bascones, D. A. Ivanov
We study the effect of spin-flip scattering on the density of states in a long diffusive S-N junction with transparent interface. We calculate the critical value of the spin-flip s…
Antiferromagnetism and phase separation in the t-J model at low doping: a variational study
D. A. Ivanov
Using Gutzwiller-projected wave functions, I estimate the ground-state energy of the t-J model for several variational states relevant for high-temperature cuprate superconductors.…
Staggered-flux normal state in the weakly doped t-J model
D. A. Ivanov, Patrick A. Lee
A normal (non-superconducting) ground state of the t-J model may be variationally approximated by a Gutzwiller-projected wave function. Within this approximation, at small hole dop…