Symmetric Superconducting Dome Accompanied by Non-Fermi Liquid Transport in Ionic Liquid Gated-MoS2

TL;DR

This study demonstrates a symmetric superconducting dome and non-Fermi liquid transport in ionic liquid gated-MoS2, revealing a strong correlation between anomalous normal state behavior and superconductivity in a non-magnetic band insulator.

Contribution

It uncovers a symmetric superconducting dome and non-Fermi liquid behavior in MoS2, providing insights into unconventional pairing mechanisms in a non-magnetic system.

Findings

Superconducting dome symmetric around optimal doping.

Pronounced non-Fermi liquid transport near optimal doping.

Correlation between non-Fermi liquid behavior and T_c.

Abstract

In strongly correlated superconductors, the emergence of superconductivity is often accompanied by anomalous normal state. The connection between these two phenomena is considered crucial for understanding the underlying unconventional pairing mechanisms. In this study, we report analogous behavior in MoS2, a band insulator devoid of long-range magnetic order. Through ionic liquid gating, continuous doping control from the underdoped to the overdoped regime was achieved, revealing a symmetric superconducting dome that holds characteristic scaling relations mirror the behavior of strongly correlated superconductors. Strikingly, this system exhibits pronounced non-Fermi liquid transport near optimal doping, characterized by a quasi-linear temperature dependence of resistivity over a wide range and a T2-dependent Hall angle cotangent. The strength of the non-Fermi liquid transport is positively correlated with the superconducting transition temperature, with both evolving synchronously across the phase diagram. These results highlight the potential of MoS2 as an ideal platform for studying the intrinsic connection between non-Fermi liquid transport and superconductivity.