The term crystal in this context does not necessarily refer to a traditional crystalline solid like salt or diamond, but rather to any material with a highly ordered, repeating structure at the ...

The development of molecular materials whose physical properties can be controlled by external stimuli — such as light, electric field, temperature, and pressure — has recently attracted much ...

The nonlinear susceptibility is a measure of a material's nonlinear response to an applied electric field. It determines the strength of the nonlinear effects and is related to the crystal's symmetry ...