463 citations · 3k across the 44 of their papers we have counts for
5 papers · 1 filter
Precursors of the insulating state in the square lattice Hubbard model
Erik G. C. P. van Loon, Hartmut Hafermann, Mikhail Katsnelson
We study the two-dimensional square lattice Hubbard model for small to moderate interaction strengths by means of the ladder dual fermion approach. The non-local…
Nonlinearity-tolerant 8D modulation formats by set-partitioning PDM-QPSK
D. F. Bendimerad, H. Hafermann, H. Zhang
We present two new nonlinearity tolerant modulation formats at spectral efficiencies lower than 4bits/4D-symbol, obtained using a simplified bit-to-symbol mapping approach to set-p…
Multiband Dual Fermion Approach to Quantum Criticality in the Hubbard Honeycomb Lattice
Daniel Hirschmeier, Hartmut Hafermann, Alexander I. Lichtenstein
We study the Hubbard model on the honeycomb lattice in the vicinity of the quantum critical point by means of a multiband formulation of the Dual Fermion approach. Beyond the stron…
Polarization-Division Multiplexing Based on the Nonlinear Fourier Transform
Jan-Willem Goossens, Mansoor I. Yousefi, Yves Jaouën +1
Polarization-division multiplexed (PDM) transmission based on the nonlinear Fourier transform (NFT) is proposed for optical fiber communication. The NFT algorithms are generalized…
Diagrammatic routes to nonlocal correlations beyond dynamical mean field theory
G. Rohringer, H. Hafermann, A. Toschi +6
Strong electronic correlations pose one of the biggest challenges to solid state theory. We review recently developed methods that address this problem by starting with the local,…