论文标题
堆叠使原子运动的强耦合到范德华异质结光二极管中的层间激子
Stacking enabled strong coupling of atomic motion to interlayer excitons in van der Waals heterojunction photodiodes
论文作者
论文摘要
我们通过光电流测量值WSE $ _2 $/MOSE $ _2 $杂结光二极管揭示了原子运动与层间激子之间堆叠诱导的强耦合。强耦合在靠近层间激子共振的频率窗口中的光电流频谱中表现为明显的周期边带。侧带在层间层中激子光电流频谱上重复的侧带以能量增量直接出现，直接与异质结的突出振动模式相对应。这种周期性模式与层间光接电性振荡一起生动地证明了在堆栈工程设计的范德华（Van der Waals）在堆栈工程设计的异质结构中的异常强烈的激子 - phonon耦合及其对层间激发的影响。我们的结果建立了光电流光谱作为将振动耦合与层间激子询问的强大工具，并提出了一种控制固态振动物理的新兴策略。
We reveal stacking-induced strong coupling between atomic motion and interlayer excitons through photocurrent measurements of WSe$_2$/MoSe$_2$ heterojunction photodiodes. Strong coupling manifests as pronounced periodic sidebands in the photocurrent spectrum in frequency windows close to the interlayer exciton resonances. The sidebands, which repeat over large swathes of the interlayer exciton photocurrent spectrum, occur in energy increments corresponding directly to a prominent vibrational mode of the heterojunction. Such periodic patterns, together with interlayer photoconductance oscillations, vividly demonstrate the emergence of extraordinarily strong exciton-phonon coupling - and its impact on interlayer excitations - in stack-engineered van der Waals heterostructure devices. Our results establish photocurrent spectroscopy as a powerful tool for interrogating vibrational coupling to interlayer excitons and suggest an emerging strategy to control vibronic physics in the solid-state.
