However, most research has focused on the periodic and Hermitian systems, while the roles of non-Hermiticity and disorder in topological properties need to be further explored, especially for two-dimensional systems. In this paper, the topological phase transitions induced by periodic and disordered ...
Temperature tunability of topological phase transitions and edge states in two-dimensional acoustic topological insulators Article Open access 26 August 2024 Non-Hermitian topological whispering gallery Article 29 September 2021 Theory of non-Hermitian topological whispering gallery Article Open access 18...
Recently, intense research efforts have focused on exploring non-Hermitian systems with cleverly matched gain and loss, facilitating unidirectional invisibility and exotic characteristics of exceptional points3,4. Likewise, the surge in physics using topological insulators comprising non-trivial symmetry-...
non‐Hermitian topological phase transitionsThe topological properties of a generalized non〩ermitian Su–Schrieffer–Heeger model are investigated and it is demonstrated that the non〩ermitian phase transition and the non〩ermitian skin effect can be induced by intraヽell asymmetric coupling under open...
It was later discovered that the existence of the topological invariant (non-zero Chern number) is the root cause of quantization, which is independent of symmetry breaking [2]. If the Chern number is zero, the phase of the structure is ordinary; otherwise, it is topological. The Chern ...
We have studied the mutual effects of spin-orbit coupling and Zeeman field on the topological phase of a 1D non-Hermitian dimerized lattice. In the frame of the energy band theory, our results show the winding number and the chiral index are topological invariant due to the effective chiral ...
Keywords: non-Hermitian topological photonics; nonlinear; quantum optics; reconfigurable; skin effect; topological phase transition 1 Introduction In quantum mechanics, the Hamiltonian with Dirac Hermitian conjugate can generally have real eigenvalues. In this case, the Hermitian conjugate can ensure that ...
of atoms as well as the coupling strength and hopping phase between atoms. The generic chip can be rapidly reprogrammed to implement different functionalities: for example, to dynamically transform topological phases of Floquet TIs, observe statistical topological phenomena (statistical analysis of ...
Finally, and most importantly, photonics brought several fundamental and exclusive discoveries on topological physics, by combining non-Hermitian (NH) and topological physics as we describe below. Among those, the most important one (in terms of both fundamentals and applications) is the topological ...
In contrast to Hermitian systems, the addition of gain and loss allows for a new class of topological phase transition: when two oppositely charged exceptional contours touch, the topological charge can dissipate without opening a gap. These effects can be demonstrated in realistic photonics and ...