Controlling the Spin Texture of Topological Insulators by Rational Design of Organic Molecules

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• 作者：Sebastian Jakobs ; Awadhesh Narayan ; Benjamin Stadtm眉ller ; Andrea Droghetti ; Ivan Rungger ; Yew S. Hor ; Svetlana Klyatskaya ; Dominik Jungkenn ; Johannes St枚ckl ; Martin Laux ; Oliver L. A. Monti ; Martin Aeschlimann ; Robert J. Cava ; Mario Ruben ; Stefan Mathias ; Stefano Sanvito ; Mirko Cinchetti
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：September 9, 2015
• 年：2015
• 卷：15
• 期：9
• 页码：6022-6029
• 全文大小：404K
• ISSN：1530-6992

文摘

We present a rational design approach to customize the spin texture of surface states of a topological insulator. This approach relies on the extreme multifunctionality of organic molecules that are used to functionalize the surface of the prototypical topological insulator (TI) Bi₂Se₃. For the rational design we use theoretical calculations to guide the choice and chemical synthesis of appropriate molecules that customize the spin texture of Bi₂Se₃. The theoretical predictions are then verified in angular-resolved photoemission experiments. We show that, by tuning the strength of molecule鈥揟I interaction, the surface of the TI can be passivated, the Dirac point can energetically be shifted at will, and Rashba-split quantum-well interface states can be created. These tailored interface properties鈥攑assivation, spin-texture tuning, and creation of hybrid interface states鈥攍ay a solid foundation for interface-assisted molecular spintronics in spin-textured materials.