Hidalgo Alcalde, PedroMéndez Martín, BianchiPiqueras de Noriega, JavierPlaza, J. L.Dieguez, E.2023-06-202023-06-201999-08-011 X. Zhao, K. Hirakawa, and T. Ikoma, Appl. Phys. Lett. 54, 712 (1989). 2 H. Isshiki, H. Kobayashi, S. Yugo, and T. Kimura, Appl. Phys. Lett. 58, 484 (1991). 3 A. J. Neuhalfen and B. W. Wessels, Appl. Phys. Lett. 59, 2317 (1991). 4 M. Thaik, U. Hömmerich, R. N. Schwartz, R. G. Wilson, and J. M. Zavada, Appl. Phys. Lett. 71, 2641 (1997). 5 S. Kim, S. J. Rhee, D. A. Turnbull, X. Li, J. J. Coleman, S. G. Bishop, and P. B. Klein, Appl. Phys. Lett. 71, 2662 (1997). 6 Y. Sun and M. Wu, J. Appl. Phys. 78, 6691 (1995). 7 Y. Sun, M. Wu, and Y. Ting, J. Cryst. Growth 85, 449 (1996). 8 P. Hidalgo, B. Méndez, J. Piqueras, J. Plaza, and E. Diéguez, Semicond. Sci. Technol. 13, 1431 (1998). 9 R. J. Hammers, R. M. Tromp, and J. E. Demuth, Phys. Rev. Lett. 56, 1972 (1986). 10 R. M. Feenstra, Surf. Sci. 299/300, 965 (1994). 11 B. Méndez and J. Piqueras, J. Appl. Phys. 69, 2776 (1991). 12 A. Asenjo, A. Buendía, J. M. Gómez-Rodriguez, and A. Baró, J. Vac. Sci. Technol. B 12, 1658 (1994). 13 R. M. Feenstra, J. A. Stroscio, and A. P. Fein, Surf. Sci. 181, 295 (1987). 14 P. Hidalgo, B. Méndez, P. S. Dutta, J. Piqueras, and E. Diéguez, Phys. Rev. B 57, 6479 (1998). 15 B. Méndez, J. Piqueras, P. S. Dutta, and E. Diéguez, Mater. Sci. Eng., B 42, 38 (1996). 16 G. Panin, C. Díaz-Guerra, and J. Piqueras, Appl. Phys. Lett. 72, 2129 (1998).0021-897910.1063/1.370910https://hdl.handle.net/20.500.14352/58942© 1999 American Institute of Physics. This work was supported by DGES (Project No. PB96-0639) and by CICYT (Project Nos. ESP95-0148 and ESP98-1340)Er doped GaSb single crystals have been studied by scanning tunneling spectroscopy (STS) and cathodoluminescence (CL) in a combined scanning electron microscope-scanning tunnelling microscope system. The surface band gap in doped samples has been found to be about 0.5 eV while in undoped crystals the gap is close to the bulk value. Inhomogeneities in the local electronic properties of the doped crystals are studied by a correlation of the CL images and STS data.engjournal articlehttp://jap.aip.org/resource/1/japiau/v86/i3/p1449_s1http://jap.aip.org/resourceopen access538.9Phase EpitaxyCathodoluminescencePhotoluminescenceMicroscopyExcitationFísica de materiales