2026년 4월 2일(목) 물리학과 콜로퀴움 안내입니다.

연사: 김희정 박사 (서울대 이론물리학연구소)

시간: 15시

강연장소: 5호관 202호실

Host : 김정우

초록:

Superconductivity of doped graphane nanotube

We present a first-principles study of ambient-pressure superconductivity in doped graphane nanotubes. The curvature of the nanotube effectively reduces the distance between hydrogen atoms, mimicking a high-pressure environment within the confined geometry. As the nanotube radius decreases, this effect becomes more pronounced, leading to an enhanced hydrogen contribution near the valence band maximum. Upon small hole doping, we observe a significant increase in both the electron–phonon coupling strength and the logarithmic average phonon frequency (ω_log). As a result, the superconducting transition temperature is predicted to exceed 100 K at ambient pressure. Our results demonstrate a new route to high-temperature superconductivity driven by hydrogen-dominant electronic states without the need for external pressure, providing a promising platform for designing hydrogen-based superconductors at ambient pressure.