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Observation of Bulk Fermi Arc and Polarization Half Charge from Paired Exceptional Points
Hengyun Zhou, Chao Peng, Yoseob Yoon +6
The ideas of topology have found tremendous success in Hermitian physical systems, but even richer properties exist in the more general non-Hermitian framework. Here, we theoretica…
Polarization state of radiation from a photonic crystal slab
Chia Wei Hsu, Bo Zhen, Marin Soljačić +1
We point out that the polarization state of radiation from a photonic crystal slab is strongly constrained by the direct non-resonant scattering process. The phase difference betwe…
Bound states in the continuum in fiber Bragg gratings
Xingwei Gao, Bo Zhen, Marin Soljačić +2
Optical fibers typically confine light through total internal reflection or through photonic bandgaps. Here we show that light can be perfectly guided in optical fibers through a d…
Dynamically encircling exceptional points: Exact evolution and polarization state conversion
Absar U. Hassan, Bo Zhen, Marin Soljacic +2
We show that a two-level non-Hermitian Hamiltonian with constant off-diagonal exchange elements can be analyzed exactly when the underlying exceptional point is perfectly encircled…
Topological Band Theory for Non-Hermitian Hamiltonians
Huitao Shen, Bo Zhen, Liang Fu
We develop the topological band theory for systems described by non-Hermitian Hamiltonians, whose energy spectra are generally complex. After generalizing the notion of gapped band…