Ambipolar Superconductivity with Strong Pairing Interaction in Monolayer 1T′-MoTe2

Tang，Fangdong1; Wang，Peipei2; Wang，Qixing1; Gan，Yuan2; Lyu，Jian2; Mi，Xinrun3; He，Mingquan3; Zhang，Liyuan2; Smet，Jurgen H.1

2023

10.1021/acs.nanolett.3c02033

Nano Letters   Impact Factor & Quartile

1530-6984

1530-6992

Gate tunable two-dimensional (2D) superconductors offer significant advantages in studying superconducting phase transitions. Here, we address superconductivity in exfoliated 1T′-MoTe monolayers with an intrinsic band gap of ∼7.3 meV using field effect doping. Despite large differences in the dispersion of the conduction and valence bands, superconductivity can be achieved easily for both electrons and holes. The onset of superconductivity occurs near 7-8 K for both charge carrier types. This temperature is much higher than that in bulk samples. Also the in-plane upper critical field is strongly enhanced and exceeds the BCS Pauli limit in both cases. Gap information is extracted using point-contact spectroscopy. The gap ratio exceeds multiple times the value expected for BCS weak-coupling. All of these observations suggest a strong enhancement of the pairing interaction.

ambipolar superconductivity gate tunability intrinsic bandgap monolayer 1T′-MoTe2 strong pairing interaction

SCI

English

NI Journal Papers

Others

DFG[SPP2244] ; National Key Ramp;D Program of China[2022YFA1403700] ; Shenzhen Fundamental Research Fund for Distinguished Young Scholars[RCJC202007141445105] ; National Natural Science Foundation of China[11904040] ; Chongqing Research Program of Basic Research and Frontier Technology, China[cstc2020jcyj-msxmX0263] ; Chine-sisch-Deutsche Mobilitatsprogamm of Chinesisch-Deutsche Zentrum fur Wissenschaftsforderung[M-0496]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:001043737700001

AMER CHEMICAL SOC

MATERIALS SCIENCE

2-s2.0-85168438377

Scopus

1.Max Planck Institute for Solid State Research,Stuttgart,70569,Germany
2.Department of Physics and Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Low Temperature Physics Laboratory,College of Physics & Center of Quantum Materials and Devices,Chongqing University,Chongqing,401331,China

Tang，Fangdong,Wang，Peipei,Wang，Qixing,等. Ambipolar Superconductivity with Strong Pairing Interaction in Monolayer 1T′-MoTe2[J]. Nano Letters,2023.

Tang，Fangdong.,Wang，Peipei.,Wang，Qixing.,Gan，Yuan.,Lyu，Jian.,...&Smet，Jurgen H..(2023).Ambipolar Superconductivity with Strong Pairing Interaction in Monolayer 1T′-MoTe2.Nano Letters.

Tang，Fangdong,et al."Ambipolar Superconductivity with Strong Pairing Interaction in Monolayer 1T′-MoTe2".Nano Letters (2023).