Negative Thermal Hall Conductance in Two-Dimer Shastry-Sutherland Model
with {\pi}-flux Dirac Triplon
- URL: http://arxiv.org/abs/2012.08592v2
- Date: Mon, 8 Feb 2021 03:13:46 GMT
- Title: Negative Thermal Hall Conductance in Two-Dimer Shastry-Sutherland Model
with {\pi}-flux Dirac Triplon
- Authors: Hao Sun, Pinaki Sengupta, Donguk Nam, Bo Yang
- Abstract summary: We introduce an effective 2-dimer tight-binding model for the family of Shastry-Sutherland models with geometrically tunable triplon excitations.
The tilted magnetic field is also useful in reducing the bandwidth of the lowest triplon band.
- Score: 10.470619876243981
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We introduce an effective 2-dimer tight-binding model for the family of
Shastry-Sutherland models with geometrically tunable triplon excitations. The
Rashba pseudospin-orbit coupling induced by the tilted external magnetic field
leads to elementary excitations having nontrivial topological properties with
{\pi}-Berry flux. The interplay between the in-plane and out-of-plane magnetic
field thus allows us to effectively engineer the band structure in this bosonic
system. In particular, the in-plane magnetic field gives rise to Berry
curvature hotspot near the bottom of the triplon band, and at the same time
significantly increases the critical magnetic field for the topological triplon
band. We calculate explicitly the experimental signature of the thermal Hall
effect of triplons in SrCu2(BO3)2, and show a pronounced and tunabled transport
signals within the accessible parameter range, particularly with a change of
sign of the thermal Hall conductance. The tilted magnetic field is also useful
in reducing the bandwidth of the lowest triplon band. We show it can thus be a
flexible theoretical and experimental platform for the correlated bosonic
topological system.
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