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Haoning Tang
Haoning Tang @haoning_tang ·
Over decades, we’ve been taught that SHG vanishes in centrosymmetric 2D crystals. We show this is not fundamentally true: quadrupolar pathways make SHG intrinsically allowed, even without symmetry breaking. New preprint:arxiv.org/abs/2601.08830 #2Dmaterial #Optics
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Forbidden second harmonics in centrosymmetric bilayer crystals

Optical spectroscopy based on second-order nonlinearity is a critical technique for characterizing two-dimensional (2D) crystals as well as bioimaging and quantum optics. It is generally believed...

From arxiv.org
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Ferroelectric
Ferroelectric @ferro_electrics ·
Oxygen-Self-Supply Synthesis of Two-Dimensional Fe2Mo3O8 Semiconductor Single Crystal With Colossal Ferroelectric Polarization #Ferroelectric #2DMaterial #Semiconductor #CVD #SingleCrystal #Mica advanced.onlinelibrary.wiley.com/doi/10.1002/ad…
Oxygen‐Self‐Supply Synthesis of Two‐Dimensional Fe2Mo3O8 Semiconductor Single Crystal With Colossal...

An oxygen-self-supply CVD strategy is designed to synthesize a 2D Fe2Mo3O8 ferroelectric semiconductor. The FeO4 tetrahedral cage contributes to the long displacement of the iron ion and induces the...

From advanced.onlinelibrary.wiley.com
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