Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells
The effect of confinement on the exciton binding energies has been systematically investigated for two series of ZnO/ZnMgO multiquantum wells with various well widths and barrier heights. The exciton binding energies were extracted from the energy difference between the stimulated emission band indu...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2009
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| Online Access: | https://hdl.handle.net/10356/93766 http://hdl.handle.net/10220/6148 http://scitation.aip.org.ezlibproxy1.ntu.edu.sg/getabs/servlet/GetabsServlet?prog=normal&id=JAPIAU000091000004001993000001&idtype=cvips&gifs=yes |
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| author | Makino, T. Segawa, Y. Kawasaki, M. Ohtomo, A. Tamura, K. Koinuma, H. Sun, Handong |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Makino, T. Segawa, Y. Kawasaki, M. Ohtomo, A. Tamura, K. Koinuma, H. Sun, Handong |
| author_sort | Makino, T. |
| collection | NTU |
| description | The effect of confinement on the exciton binding energies has been systematically investigated for two series of ZnO/ZnMgO multiquantum wells with various well widths and barrier heights. The exciton binding energies were extracted from the energy difference between the stimulated emission band induced by inelastic exciton–exciton scattering and the free exciton absorption band. The binding energies of excitons are found to be sensitively dependent on the well widths. The experimental results of the well width dependence of binding energies are in good agreement with Coli and Bajaj’s theoretical calculations for these structures [G. Coli and K. K. Bajaj, Appl. Phys. Lett. 78, 2861 (2001)]. The remarkable reduction in coupling strength between excitons and longitudinal optical phonons is closely correlated with the enhancement of the exciton binding energy, indicating that the stability of excitons is greatly increased by the enhancement of exciton binding energy in quantum wells. |
| first_indexed | 2024-10-01T02:52:13Z |
| format | Journal Article |
| id | ntu-10356/93766 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:52:13Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | ntu-10356/937662023-02-28T19:30:49Z Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells Makino, T. Segawa, Y. Kawasaki, M. Ohtomo, A. Tamura, K. Koinuma, H. Sun, Handong School of Physical and Mathematical Sciences DRNTU::Science::Physics::Optics and light The effect of confinement on the exciton binding energies has been systematically investigated for two series of ZnO/ZnMgO multiquantum wells with various well widths and barrier heights. The exciton binding energies were extracted from the energy difference between the stimulated emission band induced by inelastic exciton–exciton scattering and the free exciton absorption band. The binding energies of excitons are found to be sensitively dependent on the well widths. The experimental results of the well width dependence of binding energies are in good agreement with Coli and Bajaj’s theoretical calculations for these structures [G. Coli and K. K. Bajaj, Appl. Phys. Lett. 78, 2861 (2001)]. The remarkable reduction in coupling strength between excitons and longitudinal optical phonons is closely correlated with the enhancement of the exciton binding energy, indicating that the stability of excitons is greatly increased by the enhancement of exciton binding energy in quantum wells. Published version 2009-11-13T03:49:38Z 2019-12-06T18:45:09Z 2009-11-13T03:49:38Z 2019-12-06T18:45:09Z 2002 2002 Journal Article Sun, H. D., Makino, T., Segawa, Y., Kawasaki, M., Ohtomo, A., Tamura, K., et al. (2002). Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells. Journal of Applied Physics., 91(4), 1993-1997. 0021-8979 https://hdl.handle.net/10356/93766 http://hdl.handle.net/10220/6148 http://scitation.aip.org.ezlibproxy1.ntu.edu.sg/getabs/servlet/GetabsServlet?prog=normal&id=JAPIAU000091000004001993000001&idtype=cvips&gifs=yes 10.1063/1.1445280 en Journal of applied physics Journal of Applied Physics © 2002 American Institute of Physics. The journal's website is located at http://jap.aip.org/. 6 p. application/pdf |
| spellingShingle | DRNTU::Science::Physics::Optics and light Makino, T. Segawa, Y. Kawasaki, M. Ohtomo, A. Tamura, K. Koinuma, H. Sun, Handong Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells |
| title | Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells |
| title_full | Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells |
| title_fullStr | Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells |
| title_full_unstemmed | Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells |
| title_short | Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells |
| title_sort | enhancement of exciton binding energies in zno znmgo multi quantum wells |
| topic | DRNTU::Science::Physics::Optics and light |
| url | https://hdl.handle.net/10356/93766 http://hdl.handle.net/10220/6148 http://scitation.aip.org.ezlibproxy1.ntu.edu.sg/getabs/servlet/GetabsServlet?prog=normal&id=JAPIAU000091000004001993000001&idtype=cvips&gifs=yes |
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