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.
- Grigori Volovik, Prof.
- Erkki Thuneberg, Visiting Prof.
- Risto Hänninen, DrTech
- Janne Karimäki, PhD student
- Nikolai Kopnin, Prof.
- Juha Kopu, DrTech, now a lecturer at Helsinki Polytechnic Stadia
- Janne Viljas, DrTech, presently at the National Board of Patents and Registration of Finland
Some of the research projects on Helium theory are detailed here.
- Nissinen, J and Volovik, G.E., "Type-III and IV interacting Weyl points", Pis'ma v Zhurnal Éksperimental'noi i Teoreticheskoi Fiziki (JETP Letters), 105, 442-443 (2017).
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, (2017). [DOI]
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, 62-63 (2017).
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]
Hietala, N., Hänninen R., Salman, H., and Barenghi, C.F., "Leapfrogging Kelvin waves", Physical Review Fluids, 1, 084501 (2016). [DOI]
Klinkhamer, F.R. and Volovik, G.E., "Dynamic cancellation of a cosmological constant and approach to the Minkowski vacuum", International Journal of Modern Physics A, 31, 1650160 (2016). [DOI]
Heikkilä, T.T., and Volovik, G.E., [In Book] Flat bands as a route to high-temperature superconductivity in graphite, Basic Physics of Functionalized Graphite (2016). [DOI]
Klinkhamer, F.R. and Volovik, G.E., "Brane realization of q-theory and the cosmological constant problem", JETP Letters/Pis'ma v Zhurnal Éksperimetal'noi i Teoreticheskoi Fiziki, 103, 711-714 (2016).
Zavjalov, V.V., Autti, S., Eltsov, V.B., Heikkinen, P.J., and Volovik, G.E., "Light Higgs channel of the resonant decay of magnon condensate in superfluid 3He-B", Nature Communications, 7, 10294 (2016). [DOI]
Silveri, M.P., Kumar, K.S., Tuorila, J., Li, J., Vepsäläinen, A., Thuneberg, E.V., and Paraoanu, G.S., "Stückelberg interference in a superconducting qubit under periodic latching modulation", New Journal of Physics, 17, 045058 (2015). [DOI]
Heikkilä, T.T. and Volovik, G.E., "Nexus and Dirac lines in topological materials", New Journal of Physics, 17, 093019 (2015). [DOI]
Zubkov, M.A. and Volovik, G.E., "Emergent gravity in graphene", Journal of Physics: Conference Series, 607, 012020 (2015). [DOI]