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robust and physiologically plausible estimates of distributed sources underlying MEG measurements, in a rather automated fashion.

OTHER PUBLICATIONS by BRU PERSONNEL

Tuoriniemi J, Juntunen-Nurmilaukas K, Uusvuori J, Pentti E, Salmela A, and Sebedash A: Superconductivity in lithium below 0.4 millikelvin at ambient pressure. Nature 2007, 447: 187–189.

Elements in the alkali metal series are regarded as unlikely superconductors because of their monovalent character. A superconducting transition temperature as high as 20 K, recently found in compressed lithium (the lightest alkali element), probably arises from pressure-induced changes in the conduction-electron band structure. Superconductivity at ambient pressure in lithium has hitherto remained unresolved, both theoretically and experimentally. Here we demonstrate that lithium is a superconductor at ambient pressure with a transition temperature of 0.4 mK. As lithium has a particularly simple conduction electron system, it represents an important case for any attempts to classify superconductors and transition temperatures, especially to determine if any non-magnetic configuration can exclude superconductivity down to zero temperature. Furthermore, the combination of extremely weak superconductivity and relatively strong nuclear magnetism in lithium would clearly lead to mutual competition between these two ordering phenomena under suitably prepared conditions.

TEACHING ACTIVITIES

COURSES

Nanoelectronics (Tfy-3.491) (Kyl-0.108 Nanophysics, Kyl-0.108 Nanofysiikka)

Lectures: Doc. Tero Heikkilä 26 hours

Teaching assistant: Matti Laakso

Quantum computing (Tfy-44.140)

Lecturer: Mikio Nakahara 20 hours (visiting professor, Kinki University, Japan)

Teaching assistant: M.Sc. Tech. Juha Voutilainen

Human systems neuroscience (University of Helsinki, Neoroscience Center & BRU, LTL, TKK) Lecture course “Brain and thinking: What brain imaging can tell about human brain function” by Prof. Riitta Hari Teaching assistant: M.Sc. Tech. Sanna Malinen

RESEARCH SEMINARS ON LOW TEMPERATURE PHYSICS AND NANOPHYSICS

Coordinators: Vladimir Eltsov, Pertti Hakonen, Tero Heikkilä, and Jukka Pekola

Alexander Savin, LTL, Finland, Parity effect in Al and Nb single electron transistors in a tunable environment, Dec 18

Tomas Novotny, Charles University in Prague, Czech Republic, Full counting statistics for interacting non-Markovian nanosystems, Dec 13

Annual Report 2007

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