Chang, Y.-M.Y.-M.ChangXu, L.L.XuTom, H.W.K.H.W.K.Tom2020-06-112020-06-11199601726218https://www.scopus.com/inward/record.uri?eid=2-s2.0-2842541462&partnerID=40&md5=4e1f7b1bacf2ebc3ef427ce317546299https://scholars.lib.ntu.edu.tw/handle/123456789/501573Observation of coherent local surface phonons on clean GaAs surfacesjournal article