76 citations · 227 across the 11 of their papers we have counts for
10 papers · 1 filter
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…
Topological nodal line in superfluid He and the Anderson theorem
T. Kamppinen, J. Rysti, M. -M. Volard +2
Superconductivity and superfluidity with anisotropic pairing -- such as -wave in cuprates and -wave in superfluid He -- are strongly suppressed by impurities. Meanwhile,…
Suppressing the Kibble-Zurek mechanism by a symmetry-violating bias
J. Rysti, J. T. Mäkinen, S. Autti +3
The formation of topological defects in continuous phase transitions is driven by the Kibble-Zurek mechanism. Here we study the formation of single- and half-quantum vortices durin…
Effects of He film on quartz tuning forks in He at ultra-low temperatures
T. S. Riekki, J. Rysti, J. T. Mäkinen +3
In pure superfluid He-B at ultra-low temperatures, quartz tuning fork oscillator response is expected to saturate when the dissipation caused by the superfluid medium becomes s…
Half-quantum vortices and walls bounded by strings in the polar-distorted phases of topological superfluid He
J. T. Mäkinen, V. V. Dmitriev, J. Nissinen +5
Symmetries of the physical world have guided formulation of fundamental laws, including relativistic quantum field theory and understanding of possible states of matter. Topologica…
Bose-Einstein condensation of magnons and spin superfluidity in the polar phase of He
S. Autti, V. V. Dmitriev, J. T. Mäkinen +5
The polar phase of He, which is topological spin-triplet superfluid with the Dirac nodal line in the spectrum of Bogolubov quasiparticles, has been recently stabilized in a nan…
Surface Waves on Superfluid 3He and 4He
M. S. Manninen, J. Rysti, I. A. Todoshchenko +1
Surface waves on both superfluid 3He and 4He were examined with the premise, that these inviscid media would represent ideal realizations for this fluid dynamics problem. The work…
Quasiparticle Damping of Surface Waves in Superfluid He and He
Matti S. Manninen, Juho Rysti, Igor Todoshchenko +1
Oscillations on free surface of superfluids at the inviscid limit are damped by quasiparticle scattering. We have studied this effect in both superfluids He and He deep bel…
Measurements on Melting Pressure, Metastable Solid Phases, and Molar Volume of Univariant Saturated Helium Mixture
J. Rysti, M. S. Manninen, J. Tuoriniemi
A concentration-saturated helium mixture at the melting pressure consists of two liquid phases and one or two solid phases. The equilibrium system is univariant, whose properties d…
Quartz Tuning Forks and Acoustic Phenomena - Application to Superfluid Helium
J. Rysti, J. Tuoriniemi
Immersed mechanical resonators are well suited for probing the properties of fluids, since the surrounding environment influences the resonant characteristics of such oscillators i…