Classical and Quantum Generalized Space-Time Engineered-Modulation (GSTEM) Metamaterials

This paper extends our previous classification of Generalized Space-Time Modulation-Engineered (GSTEM) metamaterials [1], or GSTEMs for short, by distinguishing classical and quantum GSTEMs, and discusses related principles and concepts. It aims at providing an elegant, insightful and useful perspective of metamaterials that might contribute simulating further advances of the field.