Spectral flow for skew-adjoint Fredholm operators
Spectral flow for skew-adjoint Fredholm operators
复制标题
斜伴 Fredholm 算子的谱流
DOI:
10.4171/jst/243
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发表时间:
2016
影响因子:
1
通讯作者:
H. Schulz
中科院分区:
文献类型:
--
作者:
A. Carey;J. Phillips;H. Schulz
An analytic definition of a $\mathbb{Z}_2$-valued spectral flow for paths of real skew-adjoint Fredholm operators is given. It counts the parity of the number of changes in the orientation of the eigenfunctions at eigenvalue crossings through $0$ along the path. The $\mathbb{Z}_2$-valued spectral flow is shown to satisfy a concatenation property and homotopy invariance, and it provides an isomorphism on the fundamental group of the real skew-adjoint Fredholm operators. Moreover, it is connected to a $\mathbb{Z}_2$-index pairing for suitable paths. Applications concern the zero energy bound states at defects in a Majorana chain and a spectral flow interpretation for the $\mathbb{Z}_2$-polarization in these models.
DOI:
10.1007/s00023-014-0394-5
发表时间:
2016
期刊:
Annales Henri Poincaré
影响因子:
--
作者:
G. De Nittis;H. Schulz-Baldes
通讯作者:
H. Schulz-Baldes