Publications (14)
Probing the Unconventional Superconducting State of LiFeAs by Quasiparticle Interference
T. Hänke, S. Sykora, R. Schlegel +7
A crucial step in revealing the nature of unconventional superconductivity is to investigate the symmetry of the superconducting order parameter. Scanning tunneling spectroscopy ha…
Computer aided perturbation theory by cumulants: dimerized and frustrated spin 1/2 chain
S. Sykora, A. Huebsch, K. W. Becker
This paper demonstrates that a computer aided perturbation theory can easily be realized by use of a cumulant approach. In contrast to a recent alternative formulation on the basis…
Microscopic approach to high-temperature superconductors: Pseudogap phase
S. Sykora, K. W. Becker
Despite the intense theoretical and experimental effort, an understanding of the superconducting pairing mechanism of the high-temperature superconductors is still lacking. An addi…
Analytical approach to the quantum-phase transition in the one-dimensional spinless Holstein model
S. Sykora, A. Huebsch, K. W. Becker
We study the one-dimensional Holstein model of spinless fermions interacting with dispersion-less phonons by using a recently developed projector-based renormalization method (PRM)…
Coexistence of superconductivity and charge-density waves in a two-dimensional Holstein model at half-filling
S. Sykora, A. Hübsch, K. W. Becker
In one dimension the coupling of electrons to phonons leads to a transition from a metallic to a Peierls distorted insulated state if the coupling exceeds a critical value. On the…
Projector-based renormalization method (PRM) and its application to many-particle systems
A. Hübsch, S. Sykora, K. W. Becker
Despite the advances in the development of numerical methods analytical approaches play a key role on the way towards a deeper understanding of strongly interacting systems. In thi…
Microscopic approach to high-temperature superconductors: Superconducting phase
S. Sykora, K. W. Becker
Despite the intense theoretical and experimental effort, an understanding of the superconducting pairing mechanism of the high-temperature superconductors, leading to an unpreceden…
Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs
J. Knolle, V. B. Zabolotnyy, I. Eremin +12
Using the angle-resolved photoemission spectroscopy (ARPES) data accumulated over the whole Brillouin zone (BZ) in LiFeAs we analyze the itinerant component of the dynamic spin sus…
Phase separation in the Edwards model
S. Ejima, S. Sykora, K. W. Becker +1
The nature of charge transport within a correlated background medium can be described by spinless fermions coupled to bosons in the model introduced by Edwards. Combining numerical…
Nematicity in LaFeAsO single crystals studied by elastoresistance, high-resolution thermal expansion and shear-modulus measurements
X. C. Hong, S. Sauerland, L. Wang +10
Nematicity in LaFeAsO single crystals is studied by means of high-resolution thermal expansion, shear modulus, and elastoresistivity measurements. A softening of the shear modulus…
Charge-density-wave formation in a half-filled fermion-boson transport model: A projective renormalization approach
S. Sykora, K. W. Becker, H. Fehske
We study the metal-insulator transition in a very general two-channel transport model, where charge carriers are coupled to a correlated background medium. The fluctuations of the…
Dominant particle-hole contributions to the phonon dynamics in the spinless one-dimensional Holstein model
S. Sykora, A. Huebsch, K. W. Becker
In the spinless Holstein model at half-filling the coupling of electrons to phonons is responsible for a phase transition from a metallic state at small coupling to a Peierls disto…
Static and dynamic properties of the spinless Falicov-Kimball model
K. W. Becker, S. Sykora, V. Zlatic
The spinless Falicov-Kimball model is studied by the use of a recently developed projector-based renormalization method (PRM) for many-particle Hamiltonians. The method is used to…
Single-particle excitations and phonon softening in the one-dimensional spinless Holstein model
S. Sykora, A. Huebsch, K. W. Becker +2
We investigate the influence of the electron-phonon coupling in the one-dimensional spinless Holstein model at half-filling using both a recently developed projector-based renormal…