8 papers
WannierNLQG: A Julia package for nonlinear optical responses and quantum geometry from Wannier tight-binding models
Zhuocheng Lu, Zhichao Guo, Yuanyuan Xua +2
Nonlinear optical responses and quantum geometry are central to modern condensed matter physics and are deeply intertwined. We introduce WannierNLQG, an extensible Julia framework…
Giant Nonlinear Photon-Drag Currents in Moiré Bilayers
Zhuocheng Lu, Zhuang Qian, Zhichao Guo +4
The bulk photovoltaic effect provides a fundamental pathway for direct light-to-current conversion in quantum materials. However, these nonlinear currents are often strictly constr…
Dissipation-Shaped Quantum Geometry in Nonlinear Transport
Zhichao Guo, Xing-Yuan Liu, Hua Wang +2
The theory of the intrinsic nonlinear Hall effect, a key probe of quantum geometry, is plagued by conflicting expressions for the conductivity that is independent of the dissipatio…
Projector Method for Nonlinear Light-Matter Interactions and Quantum Geometry
Zhichao Guo, Zhuocheng Lu, Hua Wang
We develop a systematic projector-based Feynman diagram framework that intrinsically encodes quantum geometry for nonlinear optical responses. By explicitly incorporating geometric…
Bicircular Light Induced Multi-State Geometric Current
Zhichao Guo, Zhuocheng Lu, Hua Wang +1
We investigate the photocurrent induced by bicircular light (BCL) in materials, with a focus on its multi-state geometric nature. BCL, a combination of left- and right-circularly p…
Intercalation of Functional Materials with Phase Transitions for Neuromorphic Applications
Xin He, Hua Wang, Jian Sun +3
Introducing foreign ions, atoms, or molecules into emerging functional materials is crucial for manipulating material physical properties and innovating device applications. The in…
Optical Manifestations of Quantum Geometry in Electron-Phonon Coupling
Jiaming Hu, Wenbin Li, Zhichao Guo +2
Quantum geometry is crucial for understanding intricate condensed matter systems, governing transport phenomena and optical responses. However, traditional studies predominantly co…
Geodesic nature and quantization of shift vector
Hua Wang, Kai Chang
We present the geodesic nature and quantization of geometric shift vector in quantum systems, with the parameter space defined by the Bloch momentum, using the Wilson loop approach…