Journal
NATURE PHYSICS
Volume 12, Issue 3, Pages 224-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS3566
Keywords
-
Categories
Funding
- NSERC of Canada
- Canada Foundation for innovation
- Canada Research Chairs Program
- Centre for Quantum Materials at the University of Toronto
- Division of Scientific User Facilities, Office of Basic Energy Science, US Department of Energy (DOE)
- National Science Foundation [DMR-0944772]
Ask authors/readers for more resources
When the energy eigenvalues of two coupled quantum states approach each other in a certain parameter space, their energy levels repel each other and level crossing is avoided(1). Such level repulsion, or avoided level crossing, is commonly used to describe the dispersion relation of quasiparticles in solids(2). However, little is known about the level repulsion when more than two quasiparticles are present; for example, in a strongly interacting quantum system where a quasiparticle can spontaneously decay into a many-particle continuum(3-5). Here we show that even in this case level repulsion exists between a long-lived quasiparticle state and a continuum. In our fine-resolution neutron spectroscopy study of magnetic quasiparticles in the frustrated quantum magnet BiCu2PO6, we observe a renormalization of the quasiparticle dispersion relation due to the presence of the continuum of multi-quasiparticle states.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available