Low-energy charge-density excitations in MgB2: Striking interplay between single-particle and collective behavior for large momenta
A sharp feature in the charge-density excitation spectra of single-crystal MgB2, displaying a remarkable cosinelike, periodic energy dispersion with momentum transfer (q) along the c* axis, has been observed for the first time by high-resolution nonresonant inelastic x-ray scattering (NIXS). Time-de...
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| Veröffentlicht in: | Physical review letters 2006-10, Vol.97 (17), p.176402-176402 |
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| container_title | Physical review letters |
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| creator | Cai, Y Q Chow, P C Restrepo, O D Takano, Y Togano, K Kito, H Ishii, H Chen, C C Liang, K S Chen, C T Tsuda, S Shin, S Kao, C C Ku, W Eguiluz, A G |
| description | A sharp feature in the charge-density excitation spectra of single-crystal MgB2, displaying a remarkable cosinelike, periodic energy dispersion with momentum transfer (q) along the c* axis, has been observed for the first time by high-resolution nonresonant inelastic x-ray scattering (NIXS). Time-dependent density-functional theory calculations show that the physics underlying the NIXS data is strong coupling between single-particle and collective degrees of freedom, mediated by large crystal local-field effects. As a result, the small-q collective mode residing in the single-particle excitation gap of the B pi bands reappears periodically in higher Brillouin zones. The NIXS data thus embody a novel signature of the layered electronic structure of MgB2. |
| doi_str_mv | 10.1103/PhysRevLett.97.176402 |
| format | Article |
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Time-dependent density-functional theory calculations show that the physics underlying the NIXS data is strong coupling between single-particle and collective degrees of freedom, mediated by large crystal local-field effects. As a result, the small-q collective mode residing in the single-particle excitation gap of the B pi bands reappears periodically in higher Brillouin zones. 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Time-dependent density-functional theory calculations show that the physics underlying the NIXS data is strong coupling between single-particle and collective degrees of freedom, mediated by large crystal local-field effects. As a result, the small-q collective mode residing in the single-particle excitation gap of the B pi bands reappears periodically in higher Brillouin zones. 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| subjects | BRILLOUIN ZONES CHARGE DENSITY DENSITY FUNCTIONAL METHOD ELECTRONIC STRUCTURE EXCITATION INELASTIC SCATTERING MAGNESIUM BORIDES MATERIALS SCIENCE MOMENTUM TRANSFER national synchrotron light source X-RAY DIFFRACTION |
| title | Low-energy charge-density excitations in MgB2: Striking interplay between single-particle and collective behavior for large momenta |
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