Pressure Induced Superconductivity in Topological Compounds

Topological quantum compounds attract worldwide attention because of many novel physical properties. Topological superconductivity is one of most excited topological quantum states since its surface supports Majorana fermions [1] that are assumed many new physics. We found superconductivity can be realized in a typical topological insulator Bi$_{2}$Te$_{3}$ induced via pressure above 3 GPa where the surface remains gapless Dirac cone[8]. The Hall coefficient measurements indicated carriers evolved as function of pressure. The x ray diffraction experiments at high pressure indicated that Bi$_{2}$Te$_{3}$ keeps stable up to 8GPa. This strongly suggests that the superconductivity observed in Bi$_{2}$Te$_{3}$ ambient phase is topological related. Acknowledgments: This work was supported by nsf {\&} MOST of China. \\[4pt] References\\[0pt] [1] 1. B. A. Bernevig et al, Science \textbf{314}, 1757 (2006).\\[0pt] [2] H. J. Zhang et al., Nature Physics \textbf{5,} 438 (2009).\\[0pt] [3] Y. Xia et al., Nature Physics \textbf{5,} 398 (2009).\\[0pt] [4] Y.-L. Chen et al., Science \textbf{325}, 178 (2009).\\[0pt] [5] Y. S. Hor et al., Phys. Rev. Lett.\textbf{104,} 57001 (2010).\\[0pt] [6] M. Einaga et al., Journal of Physics: Conference Series\textbf{ 215}, 012036(2010).\\[0pt] [7] M. Einaga et al, arXiv: 1012.4932v1 (2010).\\[0pt] [8] J. L. Zhang et al., Proc. Natl Acad. Sci. \textbf{108}, 24 (2011).