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Transverse Non-Hermitian Drift Induced by the Quantum Metric of Exceptional Rings
Zhaoyang Zhang1, Ismaël Septembre2,3, Zhenzhi Liu1
1Xi'an Jiaotong University, Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Information Photonic Technique, School of Electronic Science and Engineering, Faculty of Electronics and Information, Xi'an 710049, China.
Abstract:
Exceptional rings are sets of non-Hermitian singularities stemming from Dirac points. We study them theoretically and experimentally in an atomic vapor cell. We demonstrate the formation of an exceptional ring in a photonic honeycomb lattice by showing a transition between conical diffraction and non-Hermitian broadening of a beam in real space. We further predict and demonstrate an original non-Hermitian effect: the transverse non-Hermitian drift. It is similar to the anomalous Hall effect, but it occurs in reciprocal space, and its description requires a biorthogonal quantum metric. The non-Hermitian drift can be used for applications in beam steering.
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