A joint scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) and the Joint Physical Society of the Russian Federation dedicated to ’Absolute Negative Conductivity’ was held in the Conference Hall of the P N Lebedev Physics Institute, RAS, on 27 October 2004. The following reports were presented at the session:

1. Elesin V F (Moscow Engineering Physics Institute (StateUniversity), Moscow) ’Absolute negative conductivity phenomena in non-equilibrium three-dimensional semiconductors’;
2. Gantmakher V F, Zverev V N (Institute of Solid State Physics, RAS, Chernogolovka, Moscow Region) ’Magnetoimpurity resonances as indicators of an inverse photoelectron distribution function in semiconductors’;
3. Ryzhii V I (University of Aizu, Aizu-Wakamatsu, Japan) ’Microwave-induced negative conductivity and zero-resistance states in two-dimensional electronic systems: history and current status’;
4. Dorozhkin S I (Institute of Solid State Physics, RAS, Chernogolovka, Moscow Region) ’Millimeter-wave response in the magnetoconductivity of highly perfect two-dimensional electron systems’.