Nature of quasiparticles in itinerant correlated electron systems with geometrical frustration |
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| Institution: | 1. Metalurgical and Material Eng. Dept., Mersin University, Mersin, Turkey;2. Department of Mechanical and Metal Technologies, K?r?kkale Vocational High School, K?r?kkale University, 71450, K?r?kkale, Turkey;3. Mechanical Eng. Dept., Mersin University, Mersin, Turkey;4. Metalurgical and Material Eng. Dept., Zonguldak Bülent Ecevit University, Zonguldak, Turkey;5. Firat University, Faculty of Science, Department of Physics, 23119, Elazig, Turkey;6. Uniformity Labs, 41400 Christy Street, Fremont, CA, 94538, USA;1. Department of Materials Science, Key Laboratory of Automobile Materials, MOE, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;2. International Center for Computational Methods & Software, College of Physics, Jilin University, Changchun 130012, China;3. Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154, USA;1. Research & Development Institute in Shenzhen, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, PR China;2. Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW, 2007, Australia;3. Queen Mary University of London Engineering School, Northwestern Polytechnical University, PR China;4. College of Environmental Sciences and Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, PR China;1. Department of Physics & Astronomy and High Pressure Science and Engineering Center (HiPSEC), University of Nevada Las Vegas, Las Vegas, NV 89154, USA;2. Los Alamos National Laboratory, Los Alamos, NM, USA;3. Department of Electrical and Computer Engineering, University of Nevada Las Vegas, Las Vegas, NV 89154, USA |
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| Abstract: | Using the exact diagonalization technique, we study the effect of geometrical frustration on single-particle, spin and charge excitations in the Hubbard model in a metallic state close to half-filling. As the frustration increases, the magnetic order in the system is suppressed and the peak in the single-particle spectrum becomes sharper, indicating enhanced quasiparticle formation. Careful examination of spin and charge excitations shows that increasing frustration also leads to the merge of spin and charge excitation energies to that of the single-particle excitation. This is consistent with a Fermi liquid having well-defined quasiparticles with both spin and charge characteristics. The calculated results show that geometrical frustration plays an important role in defining the nature of quasiparticles in itinerant correlated electron systems. |
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