Topological semimetal phase with exceptional points in one-dimensional non-Hermitian systems
Kazuki Yokomizo, Shuichi Murakami
Abstract
The authors show that in the non-Hermitian Su-Schrieffer-Heeger model, a topological semimetal phase with exceptional points is stabilized due to deformations of the generalized Brillouin zone. Each energy band is divided into three regions by cusps and exceptional points on the generalized Brillouin zone.
Topics & Concepts
Brillouin zoneSemimetalPhase (matter)PhysicsTopology (electrical circuits)Geometric phaseCondensed matter physicsTheoretical physicsBand gapEnergy (signal processing)Phase transitionElectronic band structurePoint (geometry)Quantum mechanicsQuantum Mechanics and Non-Hermitian PhysicsTopological Materials and PhenomenaNonlinear Photonic Systems