The combination of broken Hermiticity and band topology in physical systems unveils a novel bound state dubbed as the non-Hermitian skin effect (NHSE). Active control that breaks reciprocity is usually used to achieve NHSE, and gain and loss in energy are inevitably involved. Here, we ...
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 ...
Such techniques have also been implemented in the quantum regime, where a linear increase in the SNR has been achieved via using entangled states. Along similar lines, coupled non-Hermitian systems have provided yet additional degrees of freedom to obtain better sensors via higher-order exceptional ...
The band degeneracy, either the exceptional point of a non-Hermitian system or the Dirac point associated with a topological system, can feature distinct symmetry and topology. Their synergy will further produce more exotic topological effects in synthetic matter.DOI...
Hermitian perturbations on many-body localization. We focus on the interacting Hatano-Nelson model which breaks unitarityviaasymmetric hopping. We explore the phase diagram for the mid-spectrum eigenstates as a function of the interaction strength and the non-Hermiticity. In contrast to the non-...
We review the current understanding of the role of topology in non-Hermitian (NH) systems, and its far-reaching physical consequences observable in a range of dissipative settings. In particular, we elucidate how the paramount and genuinely NH concept of exceptional degeneracies, at which both eige...
Directional transport and propagation of quantum particle and current, such as electron, photon, spin, and phonon, are known to occur in the materials system with broken inversion symmetry, as exemplified by the diode in semiconductor p–n junction and t
The emitted beam hosted a singularity encoded by a triade cavity mode that resides in the band gap of two interfaced valley-Hall periodic photonic lattices with opposite parity breaking. In 2020, Yang et al. [45] realized spin-momentum-locked edge mode in non Hermitian topological photonic ...
Non-Hermitian theory is a theoretical framework used to describe open systems. It offers a powerful tool in the characterization of both the intrinsic degrees of freedom of a system and the interactions with the external environment. The non-Hermitian fr
Their synergy will further produce more exotic topological effects in synthetic matter.doi:10.1038/s41467-018-05175-8Midya BikashkaliZhao HanFeng LiangNature Publishing Group UKNature communicationsB. Midya, H. Zhao, L. Feng, "Non-Hermitian photonics promises exceptional topology of light", Nat. ...