半导体
凝聚态物理
激子
极化子
声子
散射
材料科学
范德瓦尔斯力
准粒子
弹道传导
物理
光电子学
超导电性
光学
电子
量子力学
分子
作者
Jakhangirkhodja A. Tulyagankhodjaev,Petra Shih,Jessica X. Yu,Xavier Roy,Timothy C. Berkelbach,Milan Delor
摘要
The transport of energy and information in semiconductors is limited by scattering between electronic carriers and lattice phonons, resulting in diffusive and lossy transport that curtails all semiconductor technologies. Using Re6Se8Cl2, a van der Waals (vdW) superatomic semiconductor, we demonstrate the formation of acoustic exciton-polarons, an electronic quasiparticle shielded from phonon scattering. We directly image polaron transport in Re6Se8Cl2 at room temperature and reveal quasi-ballistic, wavelike propagation sustained for nanoseconds and several microns. Shielded polaron transport leads to electronic energy propagation orders of magnitude greater than in other vdW semiconductors, exceeding even silicon over nanoseconds. We propose that, counterintuitively, quasi-flat electronic bands and strong exciton–acoustic phonon coupling are together responsible for the remarkable transport properties of Re6Se8Cl2, establishing a new path to ballistic room-temperature semiconductors.
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