129 citations · 549 across the 20 of their papers we have counts for
20 papers
Superfluid He aerogel experiments as a laboratory neutron star analogue
Samuli Autti, Vanessa Graber, Brynmor Haskell
Neutron stars make a unique astrophysical test bench for our understanding of quantum physics at kilometre scales. The rotation of a neutron star features glitches, sudden spin-ups…
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.…
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…
Transport of bound quasiparticle states in a two-dimensional boundary superfluid
S. Autti, R. P. Haley, A. Jennings +8
The B phase of superfluid 3He can be cooled into the pure superfluid regime, where the thermal quasiparticle density is negligible. The bulk superfluid is surrounded by a quantum w…
Thermal transport in nanoelectronic devices cooled by on-chip magnetic refrigeration
S. Autti, F. C. Bettsworth, K. Grigoras +8
On-chip demagnetization refrigeration has recently emerged as a powerful tool for reaching microkelvin electron temperatures in nanoscale structures. The relative importance of coo…
Rotating quantum wave turbulence
J. T. Mäkinen, S. Autti, P. J. Heikkinen +6
Rotating turbulence is ubiquitous in nature. Previous works suggest that such turbulence could be described as an ensemble of interacting inertial waves across a wide range of leng…
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…
Effect of boundary condition on Kapitza resistance between superfluid He-B and sintered metal
S. Autti, A. M. Guénault, R. P. Haley +7
Understanding the temperature dependence of thermal boundary resistance, or Kapitza resistance, between liquid helium and sintered metal has posed a problem in low temperature phys…
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…
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…
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…
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…
Measurements of anisotropic mass of magnons confined in a harmonic trap in superfluid He-B
V. V. Zavjalov, S. Autti, V. B. Eltsov +1
We can pump magnons to a nearly harmonic magneto-textural trap in superfluid He-B. Using the NMR spectroscopy of levels in the trap we have measured the anisotropic magnon mass…
Observation of half-quantum vortices in topological superfluid 3He
S. Autti, V. V. Dmitriev, J. T. Mäkinen +5
One of the most sought-after objects in topological quantum matter systems is a vortex carrying half a quantum of circulation. They were originally predicted to exist in superfluid…
Light Higgs channel of the resonant decay of magnon condensate in superfluid He-B
V. V. Zavjalov, S. Autti, V. B. Eltsov +2
In superfluids the order parameter, which describes spontaneous symmetry breaking, is an analogue of the Higgs field in the Standard Model of particle physics. Oscillations of the…
Microkelvin thermometry with Bose-Einstein condensates of magnons and applications to studies of the AB interface in superfluid He
P. J. Heikkinen, S. Autti, V. B. Eltsov +2
Coherent precession of trapped Bose-Einstein condensates of magnons is a sensitive probe for magnetic relaxation processes in superfluid 3He-B down to the lowest achievable tempera…
Relaxation of Bose-Einstein Condensates of Magnons in Magneto-Textural Traps in Superfluid He-B
P. J. Heikkinen, S. Autti, V. B. Eltsov +3
In superfluid He-B externally pumped quantized spin-wave excitations or magnons spontaneously form a Bose-Einstein condensate in a 3-dimensional trap created with the order-par…
Bose analogs of MIT bag model of hadrons in coherent precession
S. Autti, V. B. Eltsov, G. E. Volovik
Recently it was demonstrated that magnon condensation in the trap exhibits the phenomenon of self-localization. When the number of magnons in the textural trap increases, they dras…
Self-localization of magnon Bose-Einstein condensates in the ground state and on excited levels: from harmonic to box-like trapping potential
S. Autti, Yu. M. Bunkov, V. B. Eltsov +5
Long-lived coherent spin precession of 3He-B at low temperatures around 0.2 Tc is a manifestation of Bose-Einstein condensation of spin-wave excitations or magnons in a magnetic tr…