2016 Fiscal Year Final Research Report
Development of the microscopic theory on external-field responses of excitonic insulators
| Project/Area Number |
15H06093
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | Chiba University |
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Principal Investigator |
Sugimoto Koudai 千葉大学, 先進科学センター, 特任助教 (70756072)
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| Project Period (FY) |
2015-08-28 – 2017-03-31
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| Keywords | 励起子絶縁体 / 遷移金属カルコゲナイド / コバルト酸化物 |
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| Outline of Final Research Achievements |
An excitonic insulator is a system where electrons and holes spontaneously form pairs (excitons) in a semiconductor or a semimetal and the pairs go into quantum condensation. We have focused on transition-metal chalcogenide Ta2NiSe5 known as a candidate material of an excitonic insulator, and have clarified the behaviors of the microscopic quantum interferences in the ultrasonic attenuation rate and the NMR relaxation rate, the diamagnetic susceptibility, and the optical conductivity from the perspective of the excitonic condensation in it. We have also shown that in cobalt oxide Pr0.5Ca0.5CoO3 the magnetic-multipole order emerges in the excitonic phase, and have studied its low-energy excaitation spectra.
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| Free Research Field |
物性理論
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