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.
Members:
- Grigori Volovik, Prof.
- Nikolai Kopnin, Prof.
- Erkki Thuneberg, Visiting Prof.
- Risto Hänninen, DrTech
- Janne Karimäki, PhD student
Former Members
- Juha Kopu, DrTech, now a lecturer at Helsinki Polytechnic Stadia
- Janne Viljas, DrTech, presently at the National Board of Patents and Registration of Finland
Research
Some of the research projects on Helium theory are detailed here.
Recent publications:
- Kopnin, N.B., Ijäs, M., Harju, A., and Heikkilä, T.T., "High-temperature surface superconductivity in rhombohedral graphite", Physical Review B, 87, 140503 (2013). [DOI]
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Hosio, J.J., Eltsov, V.B., Heikkinen, P.J., Hänninen, R., Krusius M., and L'vov, V.S., "Energy and angular momentum balance in wall-bounded quantum turbulence at very low temperatures", Nature Communications, 4, 1614 (2013). [DOI]
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Bunkov, M.Yu. and Volovik, G.E., [In Book] Spin superfluidity and magnon Bose-Einstein condensation, (2013).
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Katsnelson, M.I., Volovik, G.E., and Zubkov, M.A., "Euler–Heisenberg effective action and magnetoelectric effect in multilayer graphene", ANNALS OF PHYSICS, 331, 160-187 (2013). [DOI]
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Li, J., Silveri, M.P., Kumar, K.S., Pirkkalainen, J.-M., Vepsäläinen, A., Chien, W.C., Tuorila, J., Sillanpää, M.A., Hakonen, P.J., Thuneberg, E.V., and Paraoanu, G.S., "Motional averaging in a superconducting qubit", Nature Communications, 4, 1420 (2013). [DOI]
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Autti, S., Eltsov, V.B., Heikkinen P., Hosio, J., and Volovik, G.E., "Numerical calculation of spin-wave spectra in superfluid 3He-B", Proceedings of The 46th annual meeting of the Finnish Physical Society, (2012).
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Klinkhamer, F.R.; and Volovik, G.E., "Superluminal Neutrino and Spontaneous Breaking of Lorentz Invariance ", JETP Letters, 94, 673-675 (2012). [DOI]
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Silaev, M.A. and Volovik, G.E., "Topological Fermi arcs in superfluid 3He", Physical Review B, 86, 214511 (2012). [DOI]
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Jannes, G. and Volovik, G.E., "The cosmological constant: a lesson from topological Weyl media
", JETP Letters/Pis'ma v Zhurnal Éksperimetal'noi i Teoreticheskoi Fiziki, 96, 231-237 (2012).
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Karimäki, J.M., Hänninen, R., and Thuneberg, E.V., "Asymptotic motion of a single vortex in a rotating cylinder", Physical Review B, 85, 224519/1-9 (2012). [DOI]
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Autti, S., Eltsov, V.B., and Volovik, G.E., "Bose analogs of MIT bag model of hadrons in coherent precession", JETP Letters/Pis'ma v Zhurnal Éksperimetal'noi i Teoreticheskoi Fiziki, 95, 611-615 (2012). [URL]
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Katsnelson, M.I. and Volovik, G.E., "Quantum electrodynamics with anisotropic scaling: Heisenberg-Euler action and Schwinger pair production in the bilayer graphene", JETP Letters/Pis'ma v Zhurnal Éksperimetal'noi i Teoreticheskoi Fiziki, 95, 457-461 (2012). [URL]