Ying-Xuan Lin

1 Introduction 2D materials with in-plane anisotropy offer multiple quantum states through various mechanisms, such as manifold excitonic-transition energies,[1] orthogonal polarization directions (i.e., E parallel and E perpendicular to a specific axis),[2-4] changes in the spin order of 2D layered magnets,[5] and alterations in the ferroelectric state in 2D dielectric materials, etc.[6] These materials can be considered as new quantum materials beyond the commonly studied superconductors.