Gate-controlled current switch in graphene (2009)
Sääskilahti, Kimmo, Harju, Ari, Pasanen, Pirjo
We study numerically cross conductances in a four-terminal all-graphene setup. We show that far away from the Dirac point current flows along zigzag directions, giving the possibility to guide the...
Comparison Of Multi-Cell Multi-Antenna Cdma And Tdma Systems (2007)
Ninoslav Marina Olav, Olav Tirkkonen, Pirjo Pasanen
We evaluate system capacities for multicellular systems with different multiple access strategies. The interference from another cell sharing the same frequency is calculated, and the total...
Comparison of multi-cell multi-antenna CDMA and TDMA systems (2004)
Marina, Ninoslav, Tirkkonen, Olav, Pasanen, Pirjo
We evaluate system capacities for multicellular systems with different multiple access strategies. The interference from another cell sharing the same frequency is calculated, and the total...
M-Theory Five-brane Wrapped on Curves for Exceptional Groups (1998)
Caceres, Elena, Pasanen, Pirjo
We study the M-theory five-brane wrapped around the Seiberg-Witten curves for pure classical and exceptional groups given by an integrable system. Generically, the D4-branes arise as cuts that...
Symmetries and Observables for BF-theories in Superspace (1996)
The supersymmetric version of a topological quantum field theory describing flat connections, the super BF-theory, is studied in the superspace formalism. A set of observables related to topological...
Topological Sigma-model, Hamiltonian Dynamics and Loop Space Lefschetz Number (1995)
Niemi, Antti J., Pasanen, Pirjo
We use path integral methods and topological quantum field theory techniques to investigate a generic classical Hamiltonian system. In particular, we show that Floer's instanton equation is related...