72 citations · 109 across the 13 of their papers we have counts for
13 papers
Recent advances in the combination of nonlinearity and exceptional points
Kai Bai, Chen Lin, Jia-Zheng Li +1
The exotic physics emerging at singularities has long attracted intense theoretical and experimental attention. In non-Hermitian systems, exceptional points (EPs), unique spectral…
Observation of Arbitrarily Configurable Nonlinear Topological Modes
Kai Bai, Chen Lin, Jia-Zheng Li +3
Nonlinear topology is an emerging field that combines the intrinsic reconfigurability of nonlinear systems with the robustness of topological protection, offering fertile ground fo…
Impact of noise on nonlinear-exceptional-point-based sensors
Kai Bai, Chen Lin, Meng Xiao
Nonlinear exceptional points (NEPs), a new type of spectral singularity in nonlinear non-Hermitian systems, are expected to address the noise divergence issue encountered at linear…
Exceptional features in nonlinear Hermitian systems
Liang Fang, Kai Bai, Cheng Guo +3
Non-Hermitian systems and their topological singularities, such as exceptional points (EPs), lines, and surfaces, have recently attracted intense interest. The investigation of the…
Controlling quasi-parametric amplifications: From multiple PT-symmetry phase transitions to non-Hermitian sensing
Xiaoxiong Wu, Kai Bai, Penghong Yu +7
Quasi-parametric amplification (QPA) is a nonlinear interaction in which the idler wave is depleted through some loss mechanism. QPA plays an important role in signal amplification…
Arbitrarily configurable nonlinear topological modes
Kai Bai, Jia-Zheng Li, Tian-Rui Liu +3
Topological modes (TMs) are typically localized at boundaries, interfaces and dislocations, and exponentially decay into the bulk of a large enough lattice. Recently, the non-Hermi…
Braiding topology of symmetry-protected degeneracy points in non-Hermitian systems
Jia-Zheng Li, Kai Bai, Cheng Guo +4
Degeneracy points in non-Hermitian systems are of great interest. While a homotopic framework exists for understanding their behavior in the absence of symmetry, it does not apply…
Metallic Quantized Anomalous Hall Effect without Chiral Edge States
Kai-Zhi Bai, Bo Fu, Zhenyu Zhang +1
The quantum anomalous Hall effect (QAHE) is a topological state of matter with a quantized Hall resistance. It has been observed in some two-dimensional insulating materials such a…
Spin-dependent gain and loss in photonic quantum spin Hall systems
Tian-Rui Liu, Kai Bai, Jia-Zheng Li +3
Topological phases are greatly enriched by including non-Hermiticity. While most works focus on the topology of the eigenvalues and eigenstates, how topologically nontrivial non-He…
The suppression of Finite Size Effect within a Few Lattices
Tao Liu, Kai Bai, Yicheng Zhang +4
Boundary modes localized on the boundaries of a finite-size lattice experience a finite size effect (FSE) that could result in unwanted couplings, crosstalks and formation of gaps…
Nonlinearity enabled higher-dimensional exceptional topology
Kai Bai, Meng Xiao
The role of nonlinearity on topology has been investigated extensively in Hermitian systems, while nonlinearity has only been used as a tuning knob in a PT symmetric non-Hermitian…
Non-Markovian effect on quantum optical metrology under dissipative environment
Kai Bai, Hong-Gang Luo, Wenxian Zhang +1
Quantum metrology utilizes quantum effects to reach higher precision measurements of physical quantities compared with their classical counterparts. However the ubiquitous decohere…
Retrieving ideal precision in noisy quantum optical metrology
Kai Bai, Zhen Peng, Hong-Gang Luo +1
Quantum metrology employs quantum effects to attain a measurement precision surpassing the limit achievable in classical physics. However, it was previously found that the precisio…