arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2011.05179cond-mat.mes-hall
收藏

微扭曲双层石墨烯光电流模式的双曲线增强

Hyperbolic enhancement of photocurrent patterns in minimally twisted bilayer graphene

Sai S. Sunku, Dorri Halbertal, Tobias Stauber, Shaowen Chen, Alexander S. McLeod, Andrey Rikhter, Michael E. Berkowitz, Chiu Fan Bowen Lo, Derick E. Gonzalez-Ac… 展开作者

Sai S. Sunku, Dorri Halbertal, Tobias Stauber, Shaowen Chen, Alexander S. McLeod, Andrey Rikhter, Michael E. Berkowitz, Chiu Fan Bowen Lo, Derick E. Gonzalez-Acevedo, James C. Hone, Cory R. Dean, Michael M. Fogler, D. N. Basov

摘要:

研究了扭曲双层石墨烯(TBG)的准周期莫尔条纹及其对电子性质的影响。在小扭转角$θ$下,由于原子重构,莫尔超晶格变形为分隔微米级AB和BA堆叠区域的窄畴壁网络。我们使用扫描探针光电流成像来解决发生在这些域壁的塞贝克系数的纳米级变化。所观察到的功能变得增强中红外频率的六方氮化硼(hBN),我们使用作为TBG基板,是光学双曲线的范围内。我们的研究结果说明了纳米光电流技术的新功能,探测纳米尺度的电子不均匀性的二维材料。

英文摘要:

Quasi-periodic moiré patterns and their effect on electronic properties of twisted bilayer graphene (TBG) have been intensely studied. At small twist angle $θ$, due to atomic reconstruction, the moiré superlattice morphs into a network of narrow domain walls separating micron-scale AB and BA stacking regions. We use scanning probe photocurrent imaging to resolve nanoscale variations of the Seebeck coefficient occurring at these domain walls. The observed features become enhanced in a range of mid-infrared frequencies where the hexagonal boron nitride (hBN), which we use as a TBG substrate, is optically hyperbolic. Our results illustrate new capabilities of nano-photocurrent technique for probing nanoscale electronic inhomogeneities in two-dimensional materials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑