4 papers
Theory of Nonlinear Spectroscopy of Quantum Magnets
Anubhav Srivastava, Stefan Birnkammer, GiBaik Sim +2
Two-dimensional coherent spectroscopy (2DCS) is an established method for characterizing molecules and has been proposed in the THz regime as a new tool for probing exotic excitati…
Scattering Theory of Chiral Edge Modes in Topological Magnon Insulators
Stefan Birnkammer, Michael Knap, Johannes Knolle +2
Topological magnon insulators exhibit robust edge modes with chiral properties similar to quantum Hall edge states. However, due to their strong localization at the edges, interact…
Deconfined Quantum Criticality in the long-range, anisotropic Heisenberg Chain
Anton Romen, Stefan Birnkammer, Michael Knap
Deconfined quantum criticality describes continuous phase transitions that are not captured by the Landau-Ginzburg paradigm. Here, we investigate deconfined quantum critical points…
Signatures of Domain-Wall Confinement in Raman Spectroscopy of Ising Spin Chains
Stefan Birnkammer, Johannes Knolle, Michael Knap
Mesonic bound states of domain walls can be stabilized in quasi one-dimensional magnetic compounds. Here, we theoretically study the Raman light scattering response of a twisted Ki…