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Electrically tunable low-density superconductivity in a monolayer topological insulator

https://doi.org/10.1126/science.aar4642

Fatemi, Valla ; Wu, Sanfeng ; Cao, Yuan ; Bretheau, Landry ; Gibson, Quinn D. ; Watanabe, Kenji ; Taniguchi, Takashi ; Cava, Robert J. ; Jarillo-Herrero, Pablo ( October 2018 , Science)

Turning on superconductivity in a topologically nontrivial insulator may provide a route to search for non-Abelian topological states. However, existing demonstrations of superconductor-insulator switches have involved only topologically trivial systems. Here we report reversible, in situ electrostatic on-off switching of superconductivity in the recently established quantum spin Hall insulator monolayer tungsten ditelluride (WTe₂). Fabricated into a van der Waals field-effect transistor, the monolayer’s ground state can be continuously gate-tuned from the topological insulating to the superconducting state, with critical temperaturesT_cup to ~1 kelvin. Our results establish monolayer WTe₂as a material platform for engineering nanodevices that combine superconducting and topological phases of matter.

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Magnetoresistance and quantum oscillations of an electrostatically tuned semimetal-to-metal transition in ultrathin WTe2

https://doi.org/10.1103/PhysRevB.95.041410

Fatemi, Valla ; Gibson, Quinn D. ; Watanabe, Kenji ; Taniguchi, Takashi ; Cava, Robert J. ; Jarillo-Herrero, Pablo ( January 2017 , Physical Review B)
Observation of the nonlinear Hall effect under time-reversal-symmetric conditions

https://doi.org/10.1038/s41586-018-0807-6

Ma, Qiong ; Xu, Su-Yang ; Shen, Huitao ; MacNeill, David ; Fatemi, Valla ; Chang, Tay-Rong ; Mier Valdivia, Andrés M. ; Wu, Sanfeng ; Du, Zongzheng ; Hsu, Chuang-Han ; et al ( January 2019 , Nature)

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A new form of Ca 3 P 2 with a ring of Dirac nodes

https://doi.org/10.1063/1.4926545

Xie, Lilia S. ; Schoop, Leslie M. ; Seibel, Elizabeth M. ; Gibson, Quinn D. ; Xie, Weiwei ; Cava, Robert J. ( August 2015 , APL Materials)
Dirac metal to topological metal transition at a structural phase change in Au2Pb and prediction of Z2 topology for the superconductor

https://doi.org/10.1103/PhysRevB.91.214517

Schoop, Leslie M. ; Xie, Lilia S. ; Chen, Ru ; Gibson, Quinn D. ; Lapidus, Saul H. ; Kimchi, Itamar ; Hirschberger, Max ; Haldolaarachchige, Neel ; Ali, Mazhar N. ; Belvin, Carina A. ; et al ( June 2015 , Physical Review B)