首页|Pressure-Driven Energy Band Gap Narrowing of λ-N2
Pressure-Driven Energy Band Gap Narrowing of λ-N2
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Probing the energy band gap of solid nitrogen at high pressures is of importance for understanding pressure-driven changes in electronic structures and insulator-to-metal transitions under high pressure.The λ-N2 formed by cold compression is known to be the most stable one in all solid nitrogen phases observed so far.By optimizing the optical system,we successfully measured the high-pressure absorption spectra of λ-N2 covering the polymeric-nitrogen synthetic pressures(124 GPa-165 GPa).The measured optical band gap decreases with increasing pres-sure,from 2.23eV at 124GPa to 1.55eV at 165GPa,with a negative pressure coefficient of-18.4meV/GPa,which is consistent with the result from our ab initio total-energy calculations(-22.6meV/GPa).The extrap-olative metallization pressure for the λ-N2 is around 288(18)GPa,which is close to the metallization pressure(280 GPa)for the 7-N2 expected by previous absorption edge and direct electrical measurements.Our results provide a direct spectroscopic evidence for the pressure-driven band gap narrowing of solid nitrogen.
李月、刘静仪、吴彬彬、陶雨、耿延雷、王晓丽、雷力
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Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065,China
School of Physics and Electronic Information,Yantai University,Yantai 264005,China
国家自然科学基金国家自然科学基金国家自然科学基金中央高校基本科研业务费专项Taishan Scholars Special Funding for Construction Projects
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