3 papers
cond-mat.quant-gas2023
Magnon Bose-Einstein condensates: from time crystals and quantum chromodynamics to vortex sensing and cosmology
Jere T. Mäkinen, Samuli Autti, Vladimir B. Eltsov
Under suitable experimental conditions collective spin-wave excitations, magnons, form a Bose-Einstein condensate (BEC) where the spins precess with a globally coherent phase. Bose…
cond-mat.other2020
AC Josephson effect between two superfluid time crystals
Samuli Autti, Petri J. Heikkinen, Jere T. Mäkinen +3
Quantum time crystals are systems characterised by spontaneously emerging periodic order in the time domain. A range of such phases has been reported. The concept has even been dis…
cond-mat.other2020
Exceeding the Landau superflow speed limit with topological Bogoliubov Fermi surfaces
S. Autti, J. T. Mäkinen, J. Rysti +3
A common property of topological systems is the appearance of topologically protected zero-energy excitations. In a superconductor or superfluid such states set the critical veloci…