140 citations · 344 across the 22 of their papers we have counts for
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Quantum beat spectroscopy of repulsive Bose polarons
A. M. Morgen, S. S. Balling, K. Knakkergaard Nielsen +3
The physics of impurities in a bosonic quantum environment is a paradigmatic and challenging many-body problem that remains to be understood in its full complexity. Here, this prob…
Wave function and spatial structure of polarons in an antiferromagnetic bilayer
Jens H. Nyhegn, Georg M. Bruun, Kristian K. Nielsen
Adding a dopant to an antiferromagnetic spin background disturbs the magnetic order and leads to the formation of a quasiparticle coined the magnetic polaron, which plays a central…
Exact dynamics of two holes in two-leg antiferromagnetic ladders
K. Knakkergaard Nielsen
We study the motion of holes in a mixed-dimensional setup of an antiferromagnetic ladder, featuring nearest neighbor hopping along the ladders and Ising-type spin interactions…
Omnipresent bound state of two holes in antiferromagnetic Bethe lattices
K. Knakkergaard Nielsen
For decades, it has remained an open question, whether two dopants in the -- model bind in the strongly correlated regime of small spin couplings versus hopping, . H…