Effect of quantum confinement and influence of extra charge on the electric field gradient in ZnO |
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| Authors: | Yu S Kutin G V Mamin S B Orlinskii A P Bundakova P G Baranov |
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| Institution: | (1) A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia;(2) Federal Center of Shared Facilities of Kazan State University, Kazan, 420008, Russia;(3) Debye Institute for Nanomaterials Science, Utrecht University, 3508 TA Utrecht, The Netherlands;(4) Huygens Laboratory, Leiden University, 2300 RA Leiden, The Netherlands; |
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| Abstract: | By means of electron-nuclear double resonance (ENDOR), it is shown that the Al impurity, which acts as a shallow donor in ZnO, leads to a significant reduction of the electric field gradient in ZnO single crystals. In ZnO quantum dots, however, the gradient on the Al sites remains virtually unchanged. When the Zn2+ ion is substituted by Mn2+ in a ZnO single crystal, the electric field gradient slightly increases (by about 20%). Therefore, the Mn2+ ions can be used as probes to monitor the electric field gradients in ZnO crystals. |
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