documents, apparatuses and books, belonged to the Bulgarian physicists (Georgi Nadjakov, Milko Borissov, Emil Nadjakov, R. Andrejchin, D. Stoyanov, E. Leyarovski N. Pashov, J. Pacheva, K. Stamenov, J. Rangelov, L. Mladzhov, A. Vavrek, A. Peeva, V. Kusev), Quantum Electronics laboratory, as far as copies and originals mostly from books published in 19th and 20th centuries. Divisions Theory, Material Sciences, Nanophysics, Micro- and Acousto-electronics, Low Temperature Physics, Soft Matter Physics, Laser, Atomic, Molecular and Plasma Physics are the divisions of the Institute of Solid State Physics. Laboratories The Institute of Solid State Physics has sixteen laboratories in the end of 2011. Theoretical Department Assene Datzev is a creator of the Theoretical Department in the Institute of Physics at the Bulgarian Academy of Sciences (1970). Collective phenomena Laboratory of Collective phenomena exist since 1994 and headed by Professor D.Sc. Dimo Usunov. Electron-Phonon Interactions The Laboratory of Electron-Phonon interactions is the oldest laboratory on physics at the Bulgarian Academy of Sciences. It is a successor of Georgi Nadjakov Personal Laboratory Crystal Growth and Structural Methods Laboratory Milko Borissov initiated creation of the Laboratory of Crystal Growth and Structural Methods for the acoustoelectronic and acousto-optics investigations. Professor D.Sc. headed it since 1982 Biocompatible Materials Laboratory Laboratory of Biocompatible Materials is a new and perspective subject. Photoelectrical and Optical Phenomena in wide band gap Semiconductors Laboratory Laboratory of Photoelectrical and optical phenomena in wide band gap semiconductors occurs in the Institute of Physics under the guidance of Milko Borissov in the middle of the 20th century. Laboratory managers consistently been a correspondent member Stefan Kanev, Professor Dr. Elena Vatev Professor D.Sc. Diana Nesheva. Semiconductor Heterostructures Laboratory Laboratory of Semiconductor heterostructures was established under the leadership of Petko Kamadzhiev, Kiro Kirov and Simeon Simeonov Physical Problems of Microelectronics Laboratory Laboratory of Physical Problems of Microelectronics has based on the old Department "Silicon" (1959). Under the leadership of Professor Jordan Kasabov, corresponding member of BAS, the Laboratory reaches 40 people in 1967 created outside the Academy Central Institute for elements, renamed the Institute of Microelectronics and closed after 1989. Acoustoelectronics Laboratory Laboratory of Acoustoelectronics was established at the Institute for Solid State Physics, Bulgarian Academy of Sciences in 1977. Scientific research Acousto-electronics began under the leadership of Milko Borissov. Low Temperature Physics Laboratory Laboratory of Low-temperature physics is established at the Institute for Solid State Physics, Bulgarian Academy of Sciences by Eugene Leyarovski on July 5, 1963.