论文标题
在中间不良方向调整扭曲的双层WSE2中的激子复合物
Tuning exciton complexes in twisted bilayer WSe2 at intermediate misorientation
论文作者
论文摘要
扭曲角度在过渡金属二核苷的扭曲双层（TBLS）中修饰带对对，筛选和层间（IL）耦合。中间的不良反向（扭曲角> 15度）双层（BLS）为这些并发的物理机制提供了一个独特的机会来调整激发型行为，但很少研究。在本文中，我们测量了单层（ML），天然BL和TBL WSE2中的多体激体复合物。在TBL中观察到中性Biexciton（XX），而在未封装的ML和BL中未发现，这表明了TBL中疾病筛查的独特作用。 XX和带电的Biexciton对热解离非常健壮，并且可以通过静电掺杂来控制。 TBL在TBL中证明了动量 - 间接IL激动激素随着电子掺杂的增加而消失，这是由于Q-K和K-K山谷的近对齐而导致的。中间的不良取向样本可提供对激子复合物的高度控制，同时为研究激子耦合，频带比对和筛选提供了可能性。
Twist angle modifies the band alignment, screening, and interlayer (IL) coupling in twisted bilayers (tBLs) of transition metal dichalcogenides. Intermediate misorientation (twist angles > 15 degrees) bilayers (BLs) offer a unique opportunity to tune excitonic behavior within these concurrent physical mechanisms but are seldom studied. In this paper, we measure many-body excitonic complexes in monolayer (ML), natural BL, and tBL WSe2. Neutral biexciton (XX) is observed in tBL, while being undetected in nonencapsulated ML and BL, demonstrating unique effects of disorder screening in tBLs. The XX as well as charged biexciton are robust to thermal dissociation and are controllable by electrostatic doping. Vanishing of momentum-indirect IL excitons with increasing electron doping is demonstrated in tBL, resulting from the near alignment of Q-K and K-K valleys. Intermediate misorientation samples offer a high degree of control of excitonic complexes while offering possibilities for studying exciton-phonon coupling, band alignment, and screening.
