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Director: Pertti Hakonen
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PO BOX 15100
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FINLAND

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LT » Nano Theory » Mesoscopic superconductivity

Mesoscopic superconductivity

We study small metallic structures, which are either intrinsically superconducting, or where superconductivity is induced by the superconducting proximity effect (see below). The emphasis of our research is in the latter: we try to find out how the properties of the normal metals in contact with superconductors change as a result of the proximity effect.

Our recent publications connected to the proximity effect (to get the papers, follow the links in the Publications page):

1. Crosser, M.S, Huang, J, Pierre F, Virtanen P, Heikkilä, T.T, Wilhelm, F.K, and Birge, N.O, "Nonequilibrium transport in mesoscopic multi-terminal SNS Josephson junctions", Physical Review B, 77, 014528 (2008).
2. Virtanen, P., Zou, J., Sosnin, I., Petrashov, V.T., and Heikkilä, T.T., Phase states of multiterminal mesoscopic normal-metal-superconductor structures, Physical Review Letters 99, 217003/1-4 (2007).
3. Stenberg, M.P., Virtanen, P., and Heikkilä, T.T., Phase-dependent noise correlations in normal-superconducting structures, Physical Review B, 76, 144504/1-5 (2007).
4. Virtanen, P. and Heikkilä, T.T., Thermoelectric effects in superconducting proximity structures, Applied Physics A, 89, 625-637 (2007).
5. Virtanen, P. and Heikkilä, T.T., Peltier effects in Andreev interferometers, Physical Review B, 75, 104517/1-5 (2007).
6. Zou, J., Sosnin, I., Virtanen, P., Meschke, M., Petrashov, V.T., and Heikkilä, T.T., Influence of supercurrents on low-temperature thermopower in mesoscopic N/S structures, Journal of Low Temperature Physics, 146, 193-212 (2007).
7. M.S. Crosser, Pauli Virtanen, Tero T. Heikkila, Norman O. Birge: Supercurrent-induced temperature gradient across a nonequilibrium SNS Josephson junction, Phys. Rev. Lett., 96, 167004 (2006).
8. Francesco Giazotto, Tero T. Heikkilä, Arttu Luukanen, Alexander M. Savin, and Jukka P. Pekola: Opportunities for mesoscopics in thermometry and refrigeration: physics and applications, Rev. Mod. Phys. 78, 217 (2006).
9. Pauli Virtanen and Tero T. Heikkilä: Thermopower induced by the supercurrent in superconductor-normal-metal structures, Phys. Rev. Lett. 92, 177004 (2004).
10. F. Giazotto, T. T. Heikkilä, F. Taddei, R. Fazio, J. Pekola, and F. Beltram: Tailoring Josephson coupling through superconductivity-induced nonequilibrium, Phys. Rev. Lett. 92, 137001 (2004).
11. Tero T. Heikkilä, Tommy Vänskä, and Frank K. Wilhelm: Supercurrent-induced Peltier-like effect, Phys. Rev. B 67, 100502(R) (2003).
12. J. J. A. Baselmans, T. T. Heikkilä, B. J. van Wees, and T. M. Klapwijk: Direct observation of the transition from the conventional superconducting state to the pi-state in a controllable Josephson junction, Phys. Rev. Lett. 89, 207002 (2002).
13. Tero T. Heikkilä, Jani Särkkä, and Frank K. Wilhelm: Supercurrent-carrying density of states in mesoscopic Josephson weak links, Phys. Rev. B 66, 184513 (2002).
14. Jian Huang, F. Pierre, Tero T. Heikkilä, Frank K. Wilhelm, and Norman Birge: Observation of a controllable pi-junction in a 3-terminal Josephson device, Phys. Rev. B 66, 020507(R) (2002).
15. Markku P. Stenberg and Tero T. Heikkilä: Nonlinear shot noise in mesoscopic diffusive normal-superconducting systems, Phys. Rev. B 66, 144504 (2002).
16. Mika A. Sillanpää, Tero T. Heikkilä, Rene K. Lindell, and Pertti J. Hakonen: Inverse proximity effect in superconductors near ferromagnetic material, Europhys. Lett., 56, 590 (2001).
17. Tero T. Heikkilä, Frank K. Wilhelm and Gerd Schön: Non-equilibrium supercurrent through mesoscopic ferromagnetic weak links, Europhys. Lett. 51, 434-440 (2000).
18. Tero T. Heikkilä, Martti M. Salomaa, and Colin J. Lambert: Superconducting Proximity Effect and Universal Conductance Fluctuations, Phys. Rev. B 60, 9291 (1999).

There are also other types of mesoscopic effects in superconductivity, connected with charging effects or energy relaxation. A short explanation of these will be added in a near future.