3 papers
cond-mat.str-el2020
Breathing kagome XY quantum magnet with four-site ring exchange
Niklas Casper, Wolfram Brenig
We study the impact of trimerization (breathing) of the nearest-neighbor (NN) exchange on the planar XY spin-1/2 ferromagnet on the kagome lattice, including additional four-site r…
cond-mat.str-el2020
Finite temperature properties of alternating ferro-antiferromagnetic Heisenberg chains
Niklas Casper, Wolfram Brenig
We present a study of the spin-1/2 Heisenberg chain with alternating ferro- and antiferromagnetic exchange, focusing on the role of the exchange couplings to cover both, dimer and…
cond-mat.stat-mech2019
Magnetization dynamics in clean and disordered spin-1 XXZ chains
Jonas Richter, Niklas Casper, Wolfram Brenig +1
We study spin transport in the one-dimensional anisotropic S = 1 Heisenberg model. Particular emphasis is given to dynamics at infinite temperature, where current autocorrelations…