激子
单层
哈密顿量(控制论)
光致发光
材料科学
螺旋度
实现(概率)
物理
吸收(声学)
光电子学
分子物理学
凝聚态物理
拓扑(电路)
带隙
纳米技术
量子力学
统计
组合数学
数学优化
复合材料
数学
作者
Gaofeng Xu,Tong Zhou,Benedikt Scharf,Igor Žutić
标识
DOI:10.1103/physrevlett.125.157402
摘要
In many atomically thin materials, their optical absorption is dominated by excitonic transitions. It was recently found that optical selection rules in these materials are influenced by the band topology near the valleys. We propose that gate-controlled band ordering in a single atomic monolayer, through changes in the valley winding number and excitonic transitions, can be probed in helicity-resolved absorption and photoluminescence. This predicted tunable band topology is confirmed by combining an effective Hamiltonian and a Bethe-Salpeter equation for an accurate description of excitons, with first-principles calculations suggesting its realization in Sb-based monolayers.
科研通智能强力驱动
Strongly Powered by AbleSci AI