2026-10-13T15:53:07Z https://www.scidb.cn/oai

10.57760/sciencedb.hep.00009 2026-05-25T14:41:22Z

2026-05-25 Supplyment to the article"Interband optical conductivities in two-dimensional tilted Dirac bands revisited within the tight-binding model" doi:10.57760/sciencedb.hep.00009 en Supplyment to the article"Within the framework of linear response theory, we theoretically investigated the interband longitudinal optical conductivities (LOCs) in two-dimensional (2D) tilted Dirac bands using a tight-binding (TB) model, incorporating the effects of band tilting and Dirac-point shifting. We identified four characteristic critical frequencies in the interband LOCs of the TB model: the conventional critical frequencies, the partner frequencies, the sharp-peak frequency, and the cutoff frequency. The latter three types are consistently absent in the corresponding linearized k⋅p model. Notably, the sharp-peak frequency and cutoff frequency remain robust against variations in band tilting and Dirac-point shifting. By employing analytical expressions derived via the Lagrange multiplier method, we elucidate the origins of the conventional critical frequencies and their partner counterparts. In contrast, the sharp-peak frequency and cutoff frequency are associated with interband optical transitions at high-symmetry points of the energy bands, arising from the Pauli exclusion principle and the finite boundaries of the Brillouin zone. Our theoretical predictions are intended to guide future experimental studies on tilt-dependent optical phenomena in 2D tilted Dirac systems." Dirac semimetals; optical conductivity Chang-Xu Yan Hao-Ran Chang Hong Guo Yong-Hong Zhao Jie Lu Ling-Zhi Bai Xin Chen Jian-Tong Hou Chao-Yang Tan PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset http://www.doi.org/10.15302/frontphys.2026.095205 Science Data Bank