Abstract
Striking robustness is one special feature which makes the field of topology so fascinating. Small changes to the system (including disorder) have no effect on topological quantities due to their global nature. Nontrivial topology implies the presence of conducting surface states [1,2], which play a central role in many topological phenomena. In non-Hermitian systems, including dissipative Hamiltonians, the topic of topological physics has been recently introduced [3,4]. It could be shown that by studying the history of the evolution of a wavefunction in a non-Hermitian system, topological information can be extracted from the bulk, and not only from theedge [3]. This is an essential step forward in the analysis of topological systems, as until now probing topological states has been restricted to analyzing edge physics.
© 2015 IEEE
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