论文标题
扩散率揭示了Mose2/WSE2 Heterobilayers中层间激子的三个不同阶段
Diffusivity Reveals Three Distinct Phases of Interlayer Excitons in MoSe2/WSe2 Heterobilayers
论文作者
论文摘要
在Moiré激子晶格和激子冷凝物中，正在探索过渡金属二甲化合物（TMDC）中的电荷分离中间层激元。永久性偶极矩的存在和筛分不佳的库仑相互作用使许多人体相互作用在层间激子中特别强。在这里，我们揭示了使用时间和空间分辨的光致发光成像的Mose2/WSE2杂波中层间激子的两个不同的相变：从Moiré-Positient的被困激子到临时移动式ICCITON气体的诱因，到含Ne/H〜1011 CM-Mobileon Himmma H〜11 CM-Mobiles Himima to Inne/H〜1011 CM-Mobileon Himimma H〜11 CM-Mobileon Himimma H〜11 cm h〜11 cm〜11 cm〜11 cm〜11 cm〜11 cm〜11 cm〜 1012 cm-2。后者是Mott的转变，并在光电导率测量中得到证实。这些发现为实现层间激子的量子状态设定了基本限制。
Charge separated interlayer excitons in transition metal dichalcogenide (TMDC) heterobilayers are being explored for moiré exciton lattices and exciton condensates. The presence of permanent dipole moments and the poorly screened Coulomb interaction make many body interactions particularly strong for interlayer excitons. Here we reveal two distinct phase transitions for interlayer excitons in the MoSe2/WSe2 heterobilayer using time and spatially resolved photoluminescence imaging: from trapped excitons in the moiré-potential to the modestly mobile exciton gas as exciton density increases to ne/h ~ 1011 cm-2 and from the exciton gas to the highly mobile charge separated electron/hole plasma for ne/h > 1012 cm-2. The latter is the Mott transition and is confirmed in photoconductivity measurements. These findings set fundamental limits for achieving quantum states of interlayer excitons.
