Electron-Hole Doping Asymmetry of Superconductivity in a Strain-Tuned Organic Mott Transistor

 · Invited

Abstract

Yoshitaka Kawasugi : The electron correlation in solids, or the Mott physics, offers intriguing phenomena in materials such as unconventional superconductivity. The key parameters for controlling the Mott physics are the electronic band filling and bandwidth. However, the simultaneous control of these parameters has been lacking so far, leaving a comprehensive phase diagram of correlated materials inaccessible. By combining electrostatic doping and bending-strain techniques, we are able to control the band filling and bandwidth of an organic Mott insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl in a single sample. As a result, doping-asymmetric ambipolar superconductivity has been observed in the proximity of the Mott transition.

*This work was supported by MEXT and JSPS KAKENHI (Grant Nos. JP16H06346, JP15K17714, JP26102012 and JP25000003), JST ERATO, MEXT Nanotechnology Platform Program (Molecule and Material Synthesis), and MEXT HPCI Strategic Programs for Innovative Research (SPIRE) (Grant Nos. hp140128 and hp150112). We are also grateful for allocating computational time of the HOKUSAI GreatWave and HOKUSAI BigWaterfall supercomputer at RIKEN Advanced Center for Computing and Communication (ACCC), and the K computer at RIKEN Center for Computational Science (R-CCS). K.S. acknowledges support from the Overseas Research Fellowship Program of the Japan Society for the Promotion of Science.

–

Presenters

  • Yoshitaka Kawasugi

    • RIKEN

Authors

  • Yoshitaka Kawasugi

    • RIKEN

  • Kazuhiro Seki

    • International School for Advanced Studies
    • SISSA

  • Jiang Pu

    • Nagoya University

  • Taishi Takenobu

    • Nagoya University

  • Seiji Yunoki

    • Computational Condensed Matter Physics Laboratory, RIKEN Cluster for Pioneering Research
    • RIKEN

  • Hiroshi Yamamoto

    • Institute for Molecular Science

  • Reizo Kato

    • RIKEN