Coexisting Bi and Se surface terminations of cleaved Bi2Se3 single crystals PROJECT TITLE :Coexisting Bi and Se surface terminations of cleaved Bi2Se3 single crystalsABSTRACT:Evidence for the coexistence of both Bi and Se terminations of the topological insulator Bi2Se3 is presented that is connected with details of sample storage and cleaving procedures. X-ray photoelectron spectroscopy of the Bi 4f core levels show a lower binding energy component indicative of metallic Bi near the sample surface. Single crystals stored and cleaved in high vacuum predominantly show the usual Se surface termination while those stored in air for long periods of time have a high probability for Bi termination. The different terminations have very different electronic structures as measured by angle resolved photoelectron spectroscopy. Our photoemission studies show the Se-terminated electronic structure can be recovered after annealing at 400 °C. Did you like this research project? To get this research project Guidelines, Training and Code... Click Here facebook twitter google+ linkedin stumble pinterest Dual-superlattice calibrations for group-III species in III-V semiconductor epitaxial structure growth Characterization of surface defects on Be-implanted GaSb