000202125 001__ 202125 000202125 005__ 20240610120543.0 000202125 0247_ $$2doi$$a10.1103/PhysRevB.91.205309 000202125 0247_ $$2ISSN$$a0163-1829 000202125 0247_ $$2ISSN$$a0556-2805 000202125 0247_ $$2ISSN$$a1095-3795 000202125 0247_ $$2ISSN$$a1098-0121 000202125 0247_ $$2ISSN$$a1550-235X 000202125 0247_ $$2Handle$$a2128/8886 000202125 0247_ $$2WOS$$aWOS:000354972700010 000202125 037__ $$aFZJ-2015-04414 000202125 041__ $$aEnglish 000202125 082__ $$a530 000202125 1001_ $$0P:(DE-Juel1)143949$$aSchnedler, M.$$b0$$ufzj 000202125 245__ $$aPolarity-dependent pinning of a surface state 000202125 260__ $$aCollege Park, Md.$$bAPS$$c2015 000202125 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1435323822_10130 000202125 3367_ $$2DataCite$$aOutput Types/Journal article 000202125 3367_ $$00$$2EndNote$$aJournal Article 000202125 3367_ $$2BibTeX$$aARTICLE 000202125 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000202125 3367_ $$2DRIVER$$aarticle 000202125 520__ $$aWe illustrate a polarity-dependent Fermi level pinning at semiconductor surfaces with chargeable surface states within the fundamental band gap. Scanning tunneling spectroscopy of the GaN(101¯0) surface shows that the intrinsic surface state within the band gap pins the Fermi energy only at positive voltages, but not at negative ones. This polarity dependence is attributed to arise from limited electron transfer from the conduction band to the surface state due to quantum mechanically prohibited direct transitions. 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