2023Nano Letters

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

Fangdong Tang, Peipei Wang, Qixing Wang, Yuan Gan, Jian Lyu, Xinrun Mi, Mingquan He, Liyuan Zhang, Jurgen H. Smet

Nano Letters · 23, 7516-7523 (2023)

DOI 10.1021/acs.nanolett.3c02033

**AI thematic illustration**Concept artwork created for this paper.

Introduction

A gate can populate either the conduction band or the valence band of monolayer 1T′-MoTe₂. Although those bands have different dispersions, both electron and hole doping produced a superconducting onset near 7–8 K. Measurements in a parallel magnetic field and point-contact spectra supplied two further probes of pairing.

Author graphical abstract

A schematic of pairing on either side of an energy gap is paired with a resistance-versus-gate-voltage sketch. Resistance peaks in the gap and approaches zero on both the hole and electron sides. — © 2023 Fangdong Tang et al., published in Nano Letters by the American Chemical Society. Lossless WebP conversion at the original dimensions.Article source ↗CC BY 4.0

A closer reading

Switching carrier polarity in the same material makes the two sides of the phase diagram directly comparable. The gap measurement is especially informative: spin–orbit effects can also enhance the in-plane critical field, whereas the measured gap relative to the transition temperature provides an independent test of stronger pairing.

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