State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China.
Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
Nano Lett. 2017 Feb 8;17(2):878-885. doi: 10.1021/acs.nanolett.6b04194. Epub 2017 Jan 3.
Transitional metal ditelluride WTe has been extensively studied owing to its intriguing physical properties like nonsaturating positive magnetoresistance and being possibly a type-II Weyl semimetal. While surging research activities were devoted to the understanding of its bulk properties, it remains a substantial challenge to explore the pristine physics in atomically thin WTe. Here, we report a successful synthesis of mono- to few-layer WTe via chemical vapor deposition. Using atomically thin WTe nanosheets, we discover a previously inaccessible ambipolar behavior that enables the tunability of magnetoconductance of few-layer WTe from weak antilocalization to weak localization, revealing a strong electrical field modulation of the spin-orbit interaction under perpendicular magnetic field. These appealing physical properties unveiled in this study clearly identify WTe as a promising platform for exotic electronic and spintronic device applications.
过渡金属二碲化物 WTe 因其非饱和正磁阻和可能是一种 II 型外尔半金属等有趣的物理性质而受到广泛研究。虽然大量的研究活动致力于理解其体相性质，但在原子层薄的 WTe 中探索原始物理仍然是一个巨大的挑战。在这里，我们通过化学气相沉积成功合成了单到少层 WTe。使用原子层薄的 WTe 纳米片，我们发现了以前无法获得的双极性行为，这使得少层 WTe 的磁导率可调谐，从弱反局域到弱局域，在垂直磁场下显示出自旋轨道相互作用的强电场调制。本研究中揭示的这些吸引人的物理性质清楚地表明 WTe 是一种有前途的用于奇异电子和自旋电子器件应用的平台。
