Zobrazeno 1 - 10
of 970
pro vyhledávání: '"Feenstra R"'
Surfaces of homoepitaxially grown TiO2-terminated SrTiO3(001) were studied in situ with scanning tunneling microscopy and spectroscopy. By controlling the Ti/Sr ratio, two-dimensional domains of highly ordered linear nanostructures, so-called "nanoli
Externí odkaz:
http://arxiv.org/abs/1709.07348
Autor:
Mende, P. C., Gao, Q., Ismach, A., Chou, H., Widom, M., Ruoff, R., Colombo, L., Feenstra, R. M.
Publikováno v:
Surf. Sci. 659, 31 (2017)
The thickness and interfacial geometry of hexagonal boron nitride (hBN) films grown by chemical vapor deposition on polycrystalline nickel foils is studied using low-energy electron microscopy (LEEM). The reflectivity of the electrons, measured over
Externí odkaz:
http://arxiv.org/abs/1611.04844
Publikováno v:
J. Vac. Sci. Technol. B 33, 02B105 (2015)
A simple method is proposed for inclusion of inelastic effects (electron absorption) in computations of low-energy electron reflectivity (LEER) spectra. The theoretical spectra are formulated by matching of electron wavefunctions obtained from first-
Externí odkaz:
http://arxiv.org/abs/1411.6486
Publikováno v:
J. Vac. Sci. Technol. B 32, 04E101 (2014)
Graphene-insulator-graphene vertical tunneling structures are discussed from a theoretical perspective. Momentum conservation in such devices leads to highly nonlinear current-voltage characteristics, which with gates on the tunnel junction form pote
Externí odkaz:
http://arxiv.org/abs/1404.2122
Publikováno v:
J. Electron. Mater. 43, 819 (2014)
Graphene films prepared by heating the SiC(000-1) surface (the C-face of the {0001} surfaces) in a Si-rich environment are studied using low-energy electron diffraction (LEED) and low-energy electron microscopy (LEEM). Upon graphitization, an interfa
Externí odkaz:
http://arxiv.org/abs/1401.4552
Autor:
Clark, Kendal W., Zhang, X. -G., Gu, Gong, Park, Jewook, He, Guowei, Feenstra, R. M., Li, An-Ping
Publikováno v:
Phys. Rev. X 4, 011021(2014)
We show that Friedel charge oscillation near an interface opens a gap at the Fermi energy for electrons with wave vectors perpendicular to the interface. If the Friedel gaps on two sides of the interface are different, a nonequlibrium effect - shifti
Externí odkaz:
http://arxiv.org/abs/1401.1796
Autor:
Srivastava, N., Gao, Qin, Widom, M., Feenstra, R. M., Nie, Shu, McCarty, K. F., Vlassiouk, I. V.
Publikováno v:
Phys. Rev. B 87, 245414 (2013)
The reflectivity of low energy electrons from graphene on copper substrates is studied both experimentally and theoretically. Well-known oscillations in the reflectivity of electrons with energies 0 - 8 eV above the vacuum level are observed in the e
Externí odkaz:
http://arxiv.org/abs/1303.2904
Low-energy Electron Reflectivity from Graphene: First-Principles Computations and Approximate Models
Autor:
Feenstra, R. M., Widom, M.
Publikováno v:
Ultramicroscopy 130, 101 (2013)
A computational method is developed whereby the reflectivity of low-energy electrons from a surface can be obtained from a first-principles solution of the electronic structure of the system. The method is applied to multilayer graphene. Two bands of
Externí odkaz:
http://arxiv.org/abs/1212.5506
Autor:
Feenstra, R. M., Srivastava, N., Gao, Qin, Widom, M., Diaconescu, Bogdan, Ohta, Taisuke, Kellogg, G. L., Robinson, J. T., Vlassiouk, I. V.
Publikováno v:
Phys. Rev. B 87, 041406(R) (2013)
Low-energy reflectivity of electrons from single- and multi-layer graphene is examined both theoretically and experimentally. A series of minima in the reflectivity over the energy range of 0 - 8 eV are found, with the number of minima depending on t
Externí odkaz:
http://arxiv.org/abs/1211.6676
Publikováno v:
J. Vac. Sci. Technol. B 30, 04E102 (2012)
The formation of graphene on the SiC(000-1) surface (the C-face of the {0001} surfaces) has been studied, utilizing both disilane and neon environments. In both cases, the interface between the graphene and the SiC is found to be different than for g
Externí odkaz:
http://arxiv.org/abs/1205.0697