75 citations · 350 across the 9 of their papers we have counts for
9 papers
Magnon damping in the zigzag phase of the Kitaev-Heisenberg- model on a honeycomb lattice
R. L. Smit, S. Keupert, O. Tsyplyatyev +3
We calculate magnon dispersions and damping in the Kitaev-Heisenberg model with an off-diagonal exchange and isotropic third-nearest-neighbor interaction on a honeycomb l…
Many-body theory of magneto-elasticity in one dimension
O. Tsyplyatyev, P. Kopietz, Y. Tsui +7
We construct a many-body theory of magneto-elasticity in one dimension and show that the dynamical correlation functions of the quantum magnet, connecting the spins with phonons, i…
Elastic constants and ultrasound attenuation in the spin-liquid phase of CsCuCl
S. Streib, P. Kopietz, P. T. Cong +5
The spin excitations in the spin-liquid phase of the anisotropic triangular lattice quantum antiferromagnet CsCuCl have been shown to propagate dominantly along the crystal…
Microscopic spin-wave theory for yttrium-iron garnet films
Andreas Kreisel, Francesca Sauli, Lorenz Bartosch +1
Motivated by recent experiments on thin films of the ferromagnetic insulator yttrium-iron garnet (YIG), we have developed an efficient microscopic approach to calculate the spin-wa…
Two-loop beta-function from the exact renormalization group
Peter Kopietz
We calculate the two-loop renormalization group (RG) beta-function of a massless scalar field theory from the irreducible version of Polchinski's exact RG flow equation. To obtain…
Non-linear response and electron-electron interactions in mesoscopic metal rings
Peter Kopietz, Axel Voelker
A time-dependent electric field gives rise to a stationary non-equilibrium current I^{(2)} around a mesoscopic metal ring threaded by a magnetic flux. We show that this current, wh…