Mechanism of mechanically induced optoelectronic and spintronic phase transitions in 1D graphene spirals: insight into the role of interlayer coupling
点击次数：
影响因子：8.307
DOI码：10.1039/c7nr03432f
发表刊物：Nanoscale
摘要：Graphene spirals (GSs), an emerging carbonic nano-material with a Riemann surface, demonstrate extraordinary topological electronic signatures: interlayer coupling similar to van der Waals (vdW) heterojunctions and intralayer coupling within the spiral conformation. Based on the state-of-the-art first-principles technique, the electronic properties of the periphery-modified GSs with geometry deformation are explored under axial strain. For all GSs, there emerges a remarkable phase transition from metal to semiconductor, due to the attenuation of interlayer "sigma-bonds" reducing the interlayer tunneling probability for carriers. Analogous to graphene, GSs consist of bipartite sublattices with carbonic sp(2) hybridization as well. Once the balance of the bipartite sublattices is lost, there will emerge intense edge (corner) states, contributed by the p(z) orbitals. In contrast to isolated graphene nanoflakes, GSs realize the continuous spin-polarized edge (corner) state coupling with 1D morphology. However, the spin-polarization is blocked by the robust interlayer "sigma-bonds" so that the spintronic transition takes place until this interlayer coupling is broken. More intriguingly, an indirect-direct bandgap transition is observed, revealing excellent optical on-off features. Their tunable properties provide great potential for their application in optoelectronics, spintronics and chemical or biological sensors.
合写作者：Bingyi Liu,Wenyu Zhao,Yongyuan Jiang,Guiling Zhang
第一作者：Xiaodong Xu
论文类型：期刊论文
通讯作者：Linhua Liu,Weiqi Li,Weiquan Tian
论文编号：000405387100049
学科门类：理学
文献类型：J
卷号：9
期号：27
字数：3500
ISSN号：ISSN 2040-3364
是否译文：否
发表时间：2017-07-21
收录刊物：SCI