Lattice-Driven Chiral Charge Density Wave State in 1T-TaS$_{2}$
Manoj Singh, Boning Yu, James Huber, Bishnu Sharma, Ghilles Ainouche,, Ling Fu, Jasper van Wezel, Michael C. Boyer
TL;DR
This study uses scanning tunneling microscopy to reveal a lattice-driven chiral charge density wave state in 1T-TaS2, showing a continuous evolution of the CDW lattice and intradomain chirality linked to lattice coupling.
Contribution
It uncovers a lattice-driven origin of chirality in the NC-CDW state of 1T-TaS2, contrasting with orbital-driven chirality in similar materials.
Findings
Continuous evolution of CDW lattice from domain wall to center
Discovery of intradomain chirality in NC-CDW state
Chirality driven by strong lattice coupling
Abstract
We use scanning tunneling microscopy to study the domain structure of the nearly-commensurate charge density wave (NC-CDW) state of 1T-TaS. In our sub-angstrom characterization of the state, we find a continual evolution of the CDW lattice from domain wall to domain center, instead of a fixed CDW arrangement within a domain. Further, we uncover an intradomain chirality characterizing the NC-CDW state. Unlike the orbital-driven chirality previously observed in related transition metal dichalcogenides, the chiral nature of the NC-CDW state in 1T-TaS appears driven by a strong coupling of the NC-CDW state to the lattice.
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