CHONG-DER HU2018-09-102018-09-10199609538984http://www.scopus.com/inward/record.url?eid=2-s2.0-6144233292&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/323515We propose a simple and intuitively clear method for analysing the second-harmonic generation induced by surface states. The two-band model is used to calculate the wave functions and Green's function so that the second-harmonic current density and polarization can be evaluated. Assuming that the polarization is concentrated on the surface, we calculated the reflection intensity of the second-harmonic light. We apply our formalism to the L-gap surface states on the silver (110) surface and obtain results that agree reasonably well with experiments.[SDGs]SDG11journal article10.1088/0953-8984/8/36/0152-s2.0-6144233292WOS:A1996VF31700015