Integrating MBE materials with graphene to induce novel spin-based phenomena
Adrian G. Swartz, Kathleen M. McCreary, Wei Han, Jared J. I. Wong, Patrick M. Odenthal, Hua Wen, Jen-Ru Chen, Yufeng Hao, Rodney S. Ruoff, Jaroslav Fabian, Roland K. Kawakami
Magnetism in graphene is an emerging field that has received much theoretical attention. In particular, there have been exciting predictions for induced magnetism through proximity to a ferromagnetic insulator as well as through localized dopants and defects. Here, we discuss our experimental work using molecular beam epitaxy (MBE) to modify the surface of graphene and induce novel spin-dependent phenomena. First, we investigate the epitaxial growth the ferromagnetic insulator EuO on graphene and discuss possible scenarios for realizing exchange splitting and exchange fields by ferromagnetic insulators. Second, we investigate the properties of magnetic moments in graphene originating from localized p_z-orbital defects (i.e. adsorbed hydrogen atoms). The behavior of these magnetic moments is studied using non-local spin transport to directly probe the spin-degree of freedom of the defect-induced states. We also report the presence of enhanced electron g-factors caused by the exchange fields present in the system. Importantly, the exchange field is found to be highly gate dependent, with decreasing g-factors with increasing carrier densities.
Experimental Observation of Two Massless Dirac-Fermion Gases in Graphene-Topological Insulator Heterostructure
石墨烯和拓扑绝缘体（TI）具有不同物理性质的二维狄拉克费米子。将这两种狄拉克材料集成在一个设备中，为探索相互作用的无质量狄拉克费米子的新物理学创造了有趣的机会。在这里，我们报告了一个实际的路线，实验制造的石墨烯Sb 2 Te 3异质结构。石墨烯-TI异质结构通过使用化学气相沉积生长的石墨烯膜的干法转移来制备。ARPES测量证实了石墨烯的Sb 2 Te 3和Dirac π带的拓扑表面态的共存，并确定了石墨烯-TI异质结构中的扭曲角。结果表明，一个潜在的可调电子平台，其中两个不同的狄拉克低能态主导的输运行为。
Non-Euclidean interfaces decode the continuous landscape of graphene-induced surface reconstructions
ShanghaiTech University（上海科技大学）；Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences（中国科学院上海微系统与信息技术研究所）；Suzhou Laboratory（苏州实验室）；Technical University of Munich（慕尼黑工业大学）
Electrical Probing of Sub-Néel Spin Dynamics in Two-Dimensional Antiferromagnets Using Graphene Heterostructures
Universidad Autónoma de Madrid（马德里自治大学）；Universidad de Sevilla（塞维利亚大学）；Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC—Universidad de Zaragoza（阿拉贡纳米科学与材料研究所，西班牙国家研究委员会—萨拉戈萨大学）；Condensed Matter Physics Center (IFIMAC) and Instituto Universitario de Ciencia de Materiales “Nicolás Cabrera” (INC), Universidad Autónoma de Madrid（凝聚态物理中心及“尼古拉斯·卡布雷拉”材料科学大学研究所，马德里自治大学）
Building unconventional magnetic phases on graphene by H atom manipulation: From altermagnets to Lieb ferrimagnets
Universidad Autónoma de Madrid（马德里自治大学）；Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid（马德里自治大学凝聚态物理中心）；Instituto Nicolás Cabrera (INC), Universidad Autónoma de Madrid（马德里自治大学尼古拉斯·卡布雷拉研究所）
Massachusetts Institute of Technology（麻省理工学院）；University of Illinois Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校）；National Institute for Materials Science（国立材料研究所）；Princeton University（普林斯顿大学）
