Band structure and optical response of Kekulé-modulated $α-\mathcal{T}_3$ model

Luis E. Sánchez-González; Miguel A. Mojarro; Jeús A. Maytorena; Ramon Carrillo-Bastos

doi:10.1103/PhysRevB.111.115417

paper

Band structure and optical response of Kekulé-modulated $α - T_{3}$ model

arXiv:2411.05988 · doi:10.1103/PhysRevB.111.115417

Abstract

We study the electronic band structure and optical response of a hybrid model, a $α - T_{3}$ model featuring a $3 \times 3$ Kekulé pattern modulation. Such a hybrid system may result from the depositing of adatoms in a hexagonal lattice, where the two sublattices are displaced in the perpendicular direction, like in germanene and silicene. We derive analytical expressions for the energy dispersion and the eigenfunctions using a tight-binding approximation of nearest-neighbor hopping electrons. The energy spectrum consists of a double-cone structure with Dirac points at zero momentum caused by Brillouin zone folding and a doubly degenerate flat band resulting from destructive quantum interference effects. Furthermore, we study the spectrum of intraband and interband transitions through the joint density of states, the optical conductivity, and the Drude spectral weight. We find new conductivity terms resulting from the opening of intervalley channels that are absent in the $α - T_{3}$ model and manifest themselves as van Hove singularities in the optical response. In particular, we identify an absorption window related to intervalley transport, which serves as a viable signature for detecting Kekulé periodicity in two-dimensional materials.

arXiv comment10 pages, 7 figures

References in corpus (67)

Cited by in corpus (1)

Strain- and doping-tunable optical resonance in Kekulé-Y graphene

Band structure and optical response of Kekulé-modulated α−T3​ model

Abstract

References in corpus (67)

Cited by in corpus (1)

Band structure and optical response of Kekulé-modulated $α - T_{3}$ model