| Research Projects Supported by HKU's High Performance Computing Facilities |
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| Researcher: |
| Dr Yan Chen, Department of Physics |
| Project Title: |
| Theoretical Studies on Electronic Structure of High Temperature Superconductors |
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| Project Description: |
| High temperature superconductivity occurs when the parent antiferromagnetic insulator with the copper-oxygen plane is doped either with holes or electrons. Some substantial asymmetry exists between the less studied electron-doped and intensively studied hole-doped cuprates. In order to elucidate the mechanism of high temperature superconductivity, it is fundamentally important to clarify the origin of the similarity and the differences between the electron-doped and the hole-doped cuprates. In this project, we propose to carry out a systematic theoretical study on the electronic states of electron-doped cuprates. Our preliminary study shows the t-tˇ¦-tˇ¨-J model may explain the angle- resolved photoemission spectroscopy measurement for various doping level of electron-doped cuprates. We also intend to investigate the following problems: (1) superconductivity and other competing orders, more specifically, spin density wave; (2) the existence of two possible types of superconducting order parameters at different pockets of the Fermi surface; (3) the local electronic structure around impurities or vortex cores, both local density of states and nuclear magnetic resonance relaxation rate will be calculated. In terms of the results to be obtained, we attempt to understand profoundly some existing experimental results as well as to suggest new experiments to test our predictions. |
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| Project Duration: |
| Sep. 2003 ˇV Sep. 2006 |
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| Project Significance: |
| The projectˇ¦s science objective is to elucidate the mechanism of high temperature superconductivity, more specifically, clarifying the origin of the similarity and the differences between the electron-doped and the hole-doped cuprates. The projectˇ¦s scientific significance and impact may extend to several areas of condensed matter physics. The projectˇ¦s significance to the university and community possesses several objectives. First, a RGC grant will be attracted to provide financial support of our research. In the regard, this project will further enhance the research level on the study of superconductivity at our university. Second, one or more graduate students will be recruited to conduct the research. I intend to develop a new curriculum for undergraduate or graduate student level classes in condensed matter physics. |
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| Results Achieved: |
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Our previous project on the theoretical studies of electronic structure of
high temperature superconductors has been undertaken for two more years,
resulting in several important papers published in international circulated
journals. Yan Chen et al., Physical Review letters 89, 217001 (2002). Yan chen et al., Physical Review B 67, 220501(R) (2003). Yan chen et al., Journal of Low Temperature Physics, 131, 299 (2003). Yan Chen et al., Physical Review B 66, 104501 (2002). Yan Chen et al., Physical Review B 65 180513(R) (2002). Yan Chen et al., cond-mat/0302114. Yan Chen et al., cond-mat/0304646. The expected performance of our current project will lead to 2-4 Physical Review papers annually. ˇ@ |
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| Remarks on the Use of High Performance Computing Cluster: |
| Very intensive numerical computations will be conducted in our project. In this regard, HPC Cluster will be extremely helpful for us to accomplish our research goal. |
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| Email Address: |
| yanchen@hkucc.hku.hk |
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