Related Experiment Video
Updated: Jun 5, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
Published on: July 5, 2019
Tunable Mirror-Symmetric Type-III Ising Superconductivity in Atomically-Thin Natural Van der Waals Heterostructures
Xikang Sun1, Zhengkuan Deng1, Yichen Yang2
1School of Physics, and State Key Laboratory of Silicon Materials and Advanced Semiconductor Materials, Zhejiang University, Hangzhou, 310027, China.
Abstract:
Van der Waals (vdW) crystals with strong spin-orbit coupling (SOC) provide great opportunities for exploring unconventional 2D superconductors, wherein new pairing states emerge due to the interplay of SOC with crystalline symmetries, electronic correlations, quenched disorders and external modulation forces, etc. Here, a distinct mirror-symmetry protected Ising pairing state with unprecedented Γ- and M-valley symmetries in natural vdW heterostructures (vdWH) of interweaving tetragonal SnSe and trigonal 1H-TaSe2 monolayers is reported, in which the unidirectional lattice interlocking effectively suppresses the K-valley Ising pairing mechanism by incommensurate charge-density-wave (CDW) transitions. In the 2D limit of an TaSe2/SnSe bilayer with intact basal mirror symmetry (Mz), the mirror-symmetric vdWH Ising superconductors show anomalous in-plane magnetic field B‖-controlled enhancements in the critical temperature Tc, which is completely absent for multilayer vdWHs with broken Mz induced by orthorhombic stacking between nearest-neighbour TaSe2 monolayers. The experimental observations consistently reveal a mirror symmetry-protected type-III Ising state in the inversion asymmetric lattice of 1H-TaSe2, which is predicted to be a mixture of spin-singlet and spin-triplet states.
More Related Videos
Related Concept Videos
Types Of Superconductors
Superconductor
Biasing of Metal-Semiconductor Junctions
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
Types of Semiconductors

