Angle-resolved photoemission spectroscopy (ARPES) clearly demonstrated that our trilayer graphene with ABA stacking has a massless Dirac-like band near the Fermi level, while that with ABC stacking shows a parabolic non-Dirac-like band dispersion.NPG Asia Materials...
近日,美国宾夕法尼亚大学A. T. Charlie Johnson课题组的高兆理等研究者报道了一种基于镍铜梯度合金衬底的CVD外延生长三层石墨烯的方法。研究团队使用纳米角分辨光电子谱(nanoARPES),透射电子显微镜(TEM)和红外扫描近场光学显微镜(IR-SNOM)证实了ABA-TLG和ABC-TLG的存在。 图1. 基于衬底曲率的三层石墨烯堆叠选择(...
and red arrows respectively. The top monolayer graphene is a continuous film that spans the entire image, while the bilayer and trilayer regions remain hexagonal flakes.c3D ARPES intensity plot showing the Fermi surface plane of the graphene film with electronic band structure of the graphene flakes...
外延生长策略创新:首次通过PA-MBE在石墨烯上实现非对称堆叠h-BN多层膜,生长温度较CVD降低(≈1000°C),且无需金属催化基底。 实验支持:STEM显示ABA堆叠(图3a),ARPES验证π带分裂(图2b-c)。 极化机制揭示:理论计算表明h-BN/graphene莫...
近日,美国宾夕法尼亚大学A. T. Charlie Johnson课题组的高兆理等研究者报道了一种基于镍铜梯度合金衬底的CVD外延生长三层石墨烯的方法。研究团队使用纳米角分辨光电子谱(nanoARPES),透射电子显微镜(TEM)和红外扫描近场光学显微镜(IR-SNOM)证实了ABA-TLG和ABC-TLG的存在。