To Twist or Not to Twist: From Screw Dislocation Driven Growth to 2D Quantum Materials
扭转或不扭转:从螺位错驱动增长到二维量子材料
Song Jin（金松）
ABSRACT
Rationally and precisely controlling the size, dimension, and morphology of nanostructures allows us to tune the electronic structures and quantum states of matter, discover new physical properties, thus enable applications in electronics, photonics, and renewable energy. Over the last decade, we discovered and developed the screw dislocation-driven growth of 1D nanowires and nanotubes, 2D spiral nanoplates, and 3D tree-like nanomaterials. Furthermore, screw dislocations result in strain and stress and thus systematic twist of crystal lattice, known as the Eshelby twist, that can be modulated. In MX2 and other 2D layered materials, screw dislocations can influence their chirality and layer stackings, and thus the physical properties. Recently, we developed a new geometric model to achieve systematic twisting of MX2 spiral layers beyond the Eshelby twist to realize Moire superlattices, which can lead to novel quantum phenomena. Tuning the phase, stacking, and now especially the twisting of 2D materials offers new dimensions in the controllable growth of complex 2D quantum materials promising for the study of moiré excitons, chiral optoelectronics, valleytronics and twistronics.
通过合理和精确地控制纳米结构的大小、尺寸和形貌，我们可以调整物质的电子结构和量子态，发现新的物理特性，从而促成在电子、光子学和可再生能源等方面的应用。在过去的十年里，我们发现并发展了螺位错驱动技术来生长一维纳米线和纳米管、二维螺旋纳米片和三维树状纳米材料。此外，螺位错会产生应变和应力从而导致可调节的晶格的系统性扭转，即Eshelby（埃西比）扭转。在MX2等二维层状材料中，螺位错会影响其手性和层堆叠，进而影响物理性能。最近，我们发展了一种新的几何模型来实现超越Eshelby扭转的MX2螺旋层的系统扭转，从而实现莫尔超晶格，这可能产生新的量子现象。通过调控二维材料的相位调整、叠加以及扭转，可为复杂二维量子材料的可控生长提供新的维度，并在莫尔激子、手性光电子、谷电子学和扭转电子学等领域具有重要前景。
BIOGRAPHY
Prof. Song Jin received his B.S. from Peking University in 1997, Ph.D. in 2002 from Cornell University under the direction of Prof. Francis J. DiSalvo and carried out his postdoctoral research under the direction of Prof. Charles M. Lieber at Harvard University. Dr. Jin is interested in the chemistry, physics and technological applications of nanoscale and solid-state materials. Dr. Jin discovered and developed the screw dislocation-driven growth of nanomaterial and enabled innovative synthesis of a variety of nanomaterials including metal chalcogenides, silicides, and halide perovskites. Building on such fundamental understandings, Jin advances the exploitation of (nano)materials for electrocatalysis, solar energy conversion, optoelectronics, nanospintronics, and biotechnology. Dr. Jin has authored or co-authored over 210 publications and 8 patents. He has been recognized with a NSF CAREER Award, a Research Corporation Cottrell Scholar Award and as one of world’s top 35 innovators under the age of 35 (TR35 Award) by the MIT Technology Review Magazine, the ACS ExxonMobil Solid State Chemistry Fellowship, and the Alfred P. Sloan Research Fellowship, U. of Wisconsin-Madison Vilas Associate Award and H. I. Romnes Faculty Fellowship, and the ACS Inorganic Nanoscience Award. He also serves as a Senior Editor for ACS Energy Letters.
金松教授，1997年在北京大学获理学学士学位，2002年在康奈尔大学获博士学位，师从Francis J. DiSalvo院士，并在哈佛大学Charles M. Lieber教授的指导下进行博士后研究。主要研究兴趣包括纳米和固体材料的化学、物理和技术应用。金松博士发现并发展了螺位错驱动的纳米材料生长，促进了各种纳米材料的创新合成，包括金属硫族化合物、硅化物和卤素钙钛矿纳米材料。基于这些基础研究的认知，金松博士推进了电催化、太阳能转换、光电子学、纳米自旋电子学和生物技术等领域(纳米)材料的开发。迄今已发表论文210余篇，获专利8项。已获得的奖项和荣誉包括NSF CAREER奖，Research Corporation Cottrell Scholar奖，《麻省理工技术评论》杂志评选的世界35岁以下35位创新者之一(TR35奖)，ACS ExxonMobil Solid State Chemistry奖学金，威斯康星大学-麦迪逊分校Vilas Associate奖，Alfred P. Sloan研究奖学金，ACS Inorganic Nanoscience奖等。目前担任ACS Energy Letters期刊资深编辑。