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Field-induced superconductivity in MoS2

Published online by Cambridge University Press:  04 June 2013

Y. J. Zhang ,
J. T. Ye  and
Y. Iwasa
Y. J. Zhang
Affiliation:
Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
J. T. Ye
Affiliation:
Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Y. Iwasa
Affiliation:
Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan CERG, RIKEN, Hirosawa 2-1, Wako 351-0198, Japan
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Abstract

We fabricated MoS2 transistor adopting electric double layer (EDL) as gate dielectric. So far, EDL has realized p-type conducting MoS2 in addition to well-known n-type conduction showing ambipolar operation. In our study, field-effect superconducting transition of MoS2 was realized with maximum TC around 10 K. This TC is the highest not only within MoS2 compounds but also among whole TMDs. The highest TC discovered in this study lies in the carrier density region much smaller than chemically investigated region. Such compounds with small doping level have never been successfully synthesized by chemical method. Furthermore, by combining HfO2 (typical high-k material for FETs) gating with EDL gating, continuous control of carrier density, and thus quantum phase, was demonstrated. As a result, we successfully obtained the phase diagram of MoS2. Interestingly, the TC exhibits strong carrier density dependence, showing dome-shaped superconducting phase. Superconducting dome in other materials than cuprates has been reported only a few times in doped 2D semiconductors. Since FET charge accumulation is basically two dimensional, our result implies the existence of common mechanism for superconducting dome in 2D band insulators.

Keywords

thin filmmetal-insulator transitionsuperconducting
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1549: Symposium O – Carbon Functional Nanomaterials, Graphene and Related 2D-Layered Systems , 2013 , pp. 79 - 84
Copyright
Copyright © Materials Research Society 2013 

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