title: Raman selection rule for surface optical phonons in ZnS nanobelts.
abstract: We report Raman scattering results for high-quality wurtzite ZnS nanobelts (NBs) grown by chemical vapor deposition. In the Raman spectrum, the ensembles of ZnS NBs exhibit first order phonon modes at 274 cm(-1) and 350 cm(-1), corresponding to A1/E1 transverse optical and A1/E1 longitudinal optical phonons, in addition to a strong surface optical (SO) phonon mode at 329 cm(-1). The existence of the SO band is confirmed by its shift with different surrounding dielectric media. Polarization dependent Raman spectra were recorded on a single ZnS NB and for the first time a SO phonon band has been detected on a single nanobelt. Different selection rules for the SO phonon mode are shown from their corresponding E1/A1 phonon modes, and were attributed to the breaking of anisotropic translational symmetry on the NB surface.
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST), Thuwal 23955-6900, Saudi Arabia. jrhau.he@kaust.edu.sa and Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.
authors.forename: Chih-Hsiang
authors.initials: CH
authors.lastname: Ho
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST), Thuwal 23955-6900, Saudi Arabia. jrhau.he@kaust.edu.sa.
authors.forename: Purushothaman
authors.initials: P
authors.lastname: Varadhan
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST), Thuwal 23955-6900, Saudi Arabia. jrhau.he@kaust.edu.sa.
authors.forename: Hsin-Hua
authors.initials: HH
authors.lastname: Wang
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST), Thuwal 23955-6900, Saudi Arabia. jrhau.he@kaust.edu.sa.
authors.forename: Cheng-Ying
authors.initials: CY
authors.lastname: Chen
authors.affiliation: Department of Materials Science, Fudan University, Shanghai 200433, P. R. China.
authors.forename: Xiaosheng
authors.initials: X
authors.lastname: Fang
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST), Thuwal 23955-6900, Saudi Arabia. jrhau.he@kaust.edu.sa.
authors.forename: Jr-Hau
authors.initials: JH
authors.lastname: He