Funding
EMP is funded through the Horizon2020 programme of the European Commission. 
Selected Publications
- Photon Transport in a Bose-Hubbard Chain of Superconducting Artificial Atoms
G. P. Fedorov et al.Phys. Rev. Lett. 126, 180503 (2021) - Path-Dependent Supercooling of the
He3 Superfluid A-B Transition
Dmytro Lotnyk et al.Phys. Rev. Lett. 126, 215301 (2021) - Superconductivity in an extreme strange metal
D. H. Nguyen et al.Nat Commun 12, 4341 (2021) - High-Q Silicon Nitride Drum Resonators Strongly Coupled to Gates
Xin Zhou et al.Nano Lett. 21, 5738-5744 (2021) - Measurement of the 229Th isomer energy with a magnetic micro-calorimeter
T. Sikorsky et al.Phys. Rev. Lett. 125 (2020) 142503
Superfluid 4He dynamics beyond quasiparticle excitations
K. Beauvois, C. E. Campbell, J. Dawidowski, B. Fåk, H. Godfrin, E. Krotscheck, H.-J. Lauter, T. Lichtenegger, J. Ollivier, A. SultanThe dynamics of superfluid 4He at and above the Landau quasiparticle regime is investigated by high-precision inelastic neutron scattering measurements of the dynamic structure factor. A highly structured response is observed above the familiar phonon-maxon-roton spectrum, characterized by sharp thresholds for phonon-phonon, maxon-roton, and roton-roton coupling processes. The experimental dynamic structure factor is compared to the calculation of the same physical quantity by a dynamic many-body theory including three-phonon processes self-consistently. The theory is found to provide a quantitative description of the dynamics of the correlated bosons for energies up to about three times that of the Landau quasiparticles.
Phys. Rev. B 94 (2016) 024504
doi: /10.1103/PhysRevB.94.024504