Tetsuya Sakurai, Yasunori Futamura, Akira Imakura, Shigeru Iwase, Tomoya Ono,
Nonlinear Sakurai-Sugiura method for complex band structure calculation
on Oakforest-PACS

Electronic transport calculations require the computation of eigenvalues
located in a ring region and their corresponding eigenvectors of a
quadratic eigenvalue problem with T-palindromic structure. In this talk, we
propose a technique for solving such quadratic problems by using the
nonlinear Sakurai-Sugiura method. The proposed method reduces computational
costs using a T-palindromic structure and achieves high parallel efficiency
by using a contour integral. The performance of the proposed method is
evaluated on Oakforest-PACS.