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17 papers · 1 filter
Optical selection rules of topological excitons in flat bands
Mara Lozano, Hong-Yi Xie, Bruno Uchoa
Topological excitons are superpositions of electron-hole pair states, characterized by an envelope function with finite vorticity in momentum space. This vorticity is determined by…
Thermal and thermoelectric transport in flat bands with non-trivial quantum geometry
Kevin Wen, Hong-Yi Xie, Assa Auerbach +1
Although quasiparticles in flat bands have zero group velocity, they can display an anomalous velocity due to the quantum geometry. We address the thermal and thermoelectric transp…
Theory of topological exciton insulators and condensates in flat Chern bands
Hong-Yi Xie, Pouyan Ghaemi, Matteo Mitrano +1
Excitons are the neutral quasiparticles that form when Coulomb interactions create bound states between electrons and holes. Due to their bosonic nature, excitons are expected to c…
Effect of excess charge carriers and fluid medium on the magnitude and the sign of the Casimir-Lifshitz torque
P. Thiyam, Prachi Parashar, K. V. Shajesh +6
Last year, we reported a perturbative theory of the Casimir-Lifshitz torque between planar biaxially anisotropic materials in the retarded limit [Phys. Rev. Lett. {\bf 120}, 131601…
Strong Effects of Interlayer Interaction on Valence-Band Splitting in Transition Metal Dichalcogenides
Garrett Benson, Viviane Zurdo Costa, Neal Border +10
Understanding the origin of valence band maxima (VBM) splitting in transition metal dichalcogenides (TMDs) is important because it governs the unique spin and valley physics in mon…
Wigner solids of domain wall skyrmions
Kaifeng Yang, Katsumi Nagase, Yoshiro Hirayama +3
Detection and characterization of a different type of topological excitations, namely the domain wall (DW) skyrmion, has received increasing attention because the DW is ubiquitous…