Folded spectrum method

In mathematics, the folded spectrum method (FSM) is a iterative method for solving large eigenvalue problems. Here you always find a vector with an eigenvalue close to a search-value. This means you can get a vector in the middle of the spectrum without solving the matrix.

Literature

• J. K. L. MacDonald, Phys. Rev. 46, 828 - 828 (1934)
• W. Wang and A. Zunger, J. Phys. Chem. 98, 2158 (1994)
• W. Wang and A. Zunger, J. Chem. Phys. 100, 2394 (1994)
• http://www.sst.nrel.gov/topics/nano/escan.html