Helium theory

The Helium theory group studies fundamental properties of quantum condensed matter systems using superfluid phases of 3He as the main source of inspiration. The group is in constant collaboration with the experimental Rota Group in planning and conducting experiments and providing the theory for the observed phenomena, which in turn triggers new experiments.

The Helium theory group makes close connection with other areas of physics: cosmology, particle physics, black hole physics, classical and quantum turbulence, superconductivity, physics of topological media including topological insulators and systems exhibiting intrinsic quantum Hall effect, cold gases, magnetism, physics of topological defects, etc.


Former Members


Some of the research projects on Helium theory are detailed here.

Recent publications:

  1. Autti, S., Eltsov, V.B., and Volovik, G.E., "Observation of a time quasicrystal and its transition to a superfluid time crystal", Physical Review Letters, 120, 215301 (2018). [DOI]
  2. Autti, S., Heikkinen, P.J., Volovik, G.E., Zavjalov, V.V., and Eltsov, V.B., "Propagation of self-localized Q-ball solitons in the 3He universe", Physical Review B, 97, 014518 (2018). [DOI]

  3. Nissinen, J. and Volovik, G.E., "Dimensional crossover of effective orbital dynamics in polar distorted 3He-A: Transitions to antispacetime", Physical Review D, 97, 025018 (2018). [DOI]

  4. Nissinen, J. and Volovik, G.E., "Effective Minkowski-to-Euclidean signature change of the magnon BEC pseudo-Goldstone mode in polar 3He", JETP Letters, 106, 234–241 (2017). [DOI]

  5. Silveri, M.P., Tuorila, A.J., Thuneberg, E.V., and Paraoanu, G.S., "Quantum systems under frequency modulation", Reports on Progress in Physics, 80, 056002 (2017). [DOI]

  6. Klinkhamer, F.R., and Volovik, G.E., "Dark Matter from Dark Energy in q-Theory", JETP Letters/Pis'ma v Zhurnal Éksperimetal'noi i Teoreticheskoi Fiziki, 105, 74-77 (2017). [DOI]

  7. Zhang, K. and Volovik, G.E., "Lifshitz Transitions via the Type-II Dirac and Type-II Weyl Points", JETP Letters, 105, 519-525 (2017). [DOI]

  8. Klinkhamer, F.R., Savelainen, M., and Volovik, G.E., "Relaxation of vacuum energy in q-theory", JETP, 125, 268-277 (2017). [DOI]

  9. Klinkhamer, F.R., and Volovik, G.E., "Propagating q-field and q-ball solution", Modern Physics Letters A, 32, 1750103 (2017). [DOI]

  10. Nissinen, J., and Volovik, G.E., "Type-III and IV interacting Weyl points", JETP Letters/Pis'ma v Zhurnal Éksperimetal'noi i Teoreticheskoi Fiziki, 105, 447–452 (2017). [DOI]

  11. Niemetz, M., Hänninen, R., and Schoepe, W., "On the Transition from Potential Flow to Turbulence Around a Microsphere Oscillating in Superfluid 4He", Journal of Low Temperature Physics, 187, 195-220 (2017). [DOI]

  12. Autti, S., Dmitriev, V.V., Makinen, J.T., Soldatov, A.A., Volovik, G.E., Yudin, A.N., Zavjalov, V.V., and Eltsov, V.B., "Observation of half-quantum vortices in topological superfluid 3He ", Physical Review Letters, 117, 255301 (2016). [DOI]