21 citations · 24 across the 2 of their papers we have counts for
7 papers
Time crystal optomechanics
J. T. Mäkinen, P. J. Heikkinen, S. Autti +2
Time crystals are an enigmatic phase of matter in which a quantum mechanical system displays repetitive, observable motion - they spontaneously break the time translation symmetry.…
Vortex-mediated relaxation of magnon BEC into light Higgs quasiparticles
S. Autti, P. J. Heikkinen, S. M. Laine +4
A magnon Bose-Einstein condensate in superfluid He is a fine instrument for studying the surrounding macroscopic quantum system. At zero temperature, the BEC is subject to a fe…
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…
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…
Cryogenic differential amplifier for NMR applications
V. V. Zavjalov, A. M. Savin, P. J. Hakonen
We have designed and characterized a cryogenic amplifier for use in He NMR spectrometry. The amplifier, with a power consumption of mW, works at temperatures down to…
Propagation of self-localised Q-ball solitons in the He universe
S. Autti, P. J. Heikkinen, G. E. Volovik +2
In relativistic quantum field theories, compact objects of interacting bosons can become stable owing to conservation of an additive quantum number . Discovering such -balls…