Two-dimensional helical superconductivity and gapless superconducting edge modes in the heterophase <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mn>1</mn><msup><mi>T</mi><mo>′</mo></msup><mtext>−</mtext><msub><mi>WS</mi><mn>2</mn></msub><mo>/</mo><mn>2</mn><mi>H</mi><mtext>−</mtext><msub><mi>WS</mi><mn>2</mn></msub></mrow></math> bilayer

Xuance Jiang; Jennifer Cano; Yuan Ping; Yafis Barlas; Deyu Lu

doi:10.1103/lqry-yq57

Letter

Two-dimensional helical superconductivity and gapless superconducting edge modes in the heterophase $1 T^{'} − {WS}_{2} / 2 H − {WS}_{2}$ bilayer

Xuance Jiang ^1,2,*,†, Jennifer Cano ^2,3, Yuan Ping^4,5,6, Yafis Barlas ^7,‡, and Deyu Lu ^1,§

¹Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA
²Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA
³Center for Computational Quantum Physics, Flatiron Institute, New York, New York 10010, USA
⁴Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
⁵Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
⁶Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
⁷Department of Physics, University of Nevada, Reno, Nevada 89557, USA

^*Contact author: xuance@ucsb.edu
^†Present address: Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, California 93106, USA; Materials Department, University of California, Santa Barbara, Santa Barbara, California 93106, USA.
^‡Contact author: ybarlas@unr.edu
^§Contact author: dlu@bnl.gov

PDF

Phys. Rev. B 114, L020507 – Published 20 July, 2026

DOI: https://doi.org/10.1103/lqry-yq57

Abstract

We propose a material platform comprising transition-metal dichalcogenide (TMDC) heterostructures to realize two-dimensional (2D) helical superconductivity with an intrinsic gap. By van der Waals stacking a 2D superconductor ( $1 T^{'} − {WS}_{2}$ with inversion symmetry) on top of a 2D semiconductor $2 H {− W S}_{2}$ , the resulting TMDC bilayer exhibits helical superconductivity. Under an external in-plane magnetic field, the system can host finite-momentum Cooper pairing, evidenced by the divergence in the particle-particle susceptibility of a $k \cdot p$ Hamiltonian fitted to the ab initio theory band structure. By varying the strength of the in-plane magnetic field, we demonstrate that the edge can undergo a phase transition to a one-dimensional gapless phase with narrow Fermi segments corresponding to zero-energy Bogoliubov quasiparticles. The controllable one-dimensional gapless phase serves as a clear experimental fingerprint of 2D helical superconductivity. The proposed 2D TMDC heterostructure is promising for intrinsic nonreciprocal superconducting transport and the development of Majorana-based quantum devices.

Physical Review B

Export citation

Export citation

Two-dimensional helical superconductivity and gapless superconducting edge modes in the heterophase $1 T^{'} − {WS}_{2} / 2 H − {WS}_{2}$ bilayer

Abstract

Physics Subject Headings (PhySH)

Authorization Required

Other Options

Supplemental Material (Subscription Required)

References (Subscription Required)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation

Two-dimensional helical superconductivity and gapless superconducting edge modes in the heterophase 1T′−WS2/2H−WS2 bilayer

Abstract

Physics Subject Headings (PhySH)

Authorization Required

Log in via your institution

Log in via APS Member Subscription

Other Options

Supplemental Material (Subscription Required)

References (Subscription Required)

Two-dimensional helical superconductivity and gapless superconducting edge modes in the heterophase $1 T^{'} − {WS}_{2} / 2 H − {WS}_{2}$ bilayer