Asymmetry of the Atomic Core Structure of Dissociated a‐Screw Dislocation in GaN Probed by Polarization Optical Spectroscopy. Issue 9 (24th May 2019)

• Record Type: Journal Article
• Authors: Medvedev, Oleg; Albrecht, Martin; Vyvenko, Oleg
• Is Part Of: Physica status solidi. Volume 13:Issue 9(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-05-24
• Subjects: dislocations -- GaN -- photoluminescence -- polarization; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201900169
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : The a‐screw dislocation related luminescence (DRL) in n‐GaN is investigated with polarization optical spectroscopy. An unusual difference in the polarization directions of two DRL spectral components is observed: directed parallel or inclined at an angle of about 40° to the dislocation line. As a tentative explanation, that property is proposed to be due to the theoretically predicted different orientations of chemical bonds in the cores of N and Ga partials of the dissociated a‐screw dislocation. Abstract : An unusual difference in the polarization directions of two spectral luminescent lines originating from a‐screw dislocations in GaN is reported: directing either parallel or inclined at an angle of about 40° to the dislocation line. A tentative explanation of that property is proposed as a result of the theoretically predicted orientations of chemical bonds in the dissociated a‐screw dislocation core.