Recently, optical nonlinearity has emerged as a tool for tailoring topological and non-Hermitian (NH) properties, promising fast manipulation of topological phases. In this work, we observe topologically protected NH phase transitions driven by optical nonlinearity in a silicon nanophotonic Floquet ...
While several properties unique to non-Hermitian topological systems were uncovered, the fundamental role of symmetry in non-Hermitian physics has yet to be fully understood, and it has remained unclear how symmetry protects non-Hermitian topological phases. Here we show that two fundamental anti-...
such as making the electronic sensor with a high-level sensitivity and a strong r obustness66,67, advancing non-Hermitian topological magnonics and photonics to deal with the engineering of dissipation and/or gain for non-Hermitian topological phases68–70, opening new avenues for innovativ...
L. Hughes. Absence of topological insulator phases in non-Hermitian P T -symmetric Hamiltonians. Phys Rev B 84:153101, 2011. doi:10.1103/PhysRevB.84.153101.Y. C. Hu, T. L. Hughes, Absence of topological insulator phases in non-Hermitian PT- symmetric Hamiltonians. Phys. Rev. B 84, ...
Sec. 2 introduces the non-Hermitian Hamiltonian of the model. In Subsec. 3.1, we first study the SOC effects on topological phase diagrams without the Zeeman fields. The winding number and the analytic formula of the higher winding number are derived to distinguish the topological phases. Then...
Implementing this scheme in many-body systems, flat bands and edge states can be recovered by losses and gains. Further taking into account interactions, a range of novel quantum phases could arise in such non-Hermitian systems.Similar content being viewed by others A possible route towards ...
Bulk-Boundary Correspondence in Point-Gap Topological PhasesPhysical Review Letters (IF 8.1)Daichi Nakamura, Takumi Bessho, Masatoshi Sato Pub Date: 2024-03-28 Generalized bulk-boundary correspondence in periodically driven non-Hermitian systemsJournal of Physics: Condensed Matter (IF 2.3)Xiang Ji, Xiao...
题目:Non-Hermitian Parent Hamiltonian and Composite Quantum Phases | 青年科学半月谈 时间:2023年4月27日(周四)10:00 报告人:Yuchen Guo Abstract: In this talk, I plan to introduce our two recent works (arXiv: 2301.12448, arXiv: 2304.04588) on non-Hermitian interacting spin systems. I will be...
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 photonics and topological photonics, as new research fields in optics, have attracted much attention in recent years, accompanying by a great deal of new physical concepts and novel effects emerging. The two fields are gradually crossed during the development process and the non-Hermiti...