@article{1446161, recid = {1446161}, author = {Yokomizo, Kazuki,}, title = {Non-Bloch band theory of non-Hermitian systems /}, pages = {1 online resource (xiii, 92 pages) :}, note = {"Doctoral Thesis accepted by Tokyo Institute of Technology, Tokyo, Japan."}, abstract = {This book constructs a non-Bloch band theory and studies physics described by non-Hermitian Hamiltonian in terms of the theory proposed here. In non-Hermitian crystals, the author introduces the non-Bloch band theory which produces an energy spectrum in the limit of a large system size. The energy spectrum is then calculated from a generalized Brillouin zone for a complex Bloch wave number. While a generalized Brillouin zone becomes a unit circle on a complex plane in Hermitian systems, it becomes a circle with cusps in non-Hermitian systems. Such unique features of the generalized Brillouin zone realize remarkable phenomena peculiar in non-Hermitian systems. Further the author reveals rich aspects of non-Hermitian physics in terms of the non-Bloch band theory. First, a topological invariant defined by a generalized Brillouin zone implies the appearance of topological edge states. Second, a topological semimetal phase with exceptional points appears, The topological semimetal phase is unique to non-Hermitian systems because it is caused by the deformation of the generalized Brillouin zone by changes of system parameters. Third, the author reveals a certain relationship between the non-Bloch waves and non-Hermitian topology.}, url = {http://library.usi.edu/record/1446161}, doi = {https://doi.org/10.1007/978-981-19-1858-2}, }