Giri, Debasmita and Schliemann, John and Molina, Rafael A. and Lopez, Alexander (2025) Tunable plasmon modes and topological transitions in monolayer and bilayer semi-Dirac materials. PHYSICAL REVIEW B, 112 (16): 165420. ISSN 2469-9950, 2469-9969
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We investigate the plasmonic response of single- and bilayer semi-Dirac materials under the influence of a tunable parameter that governs topological transitions via Dirac cone generation/merging and incorporating band inversion terms. For single-layer systems, we demonstrate that the emergence of Dirac cones leads to an enhanced plasmon frequency range and that the plasmonic spectrum exhibits strong anisotropy, especially for finite values of the merging parameter and vanishing inversion terms. In the bilayer configurations, we uncover a second plasmon mode whose relative phase, with respect to the first mode, can be actively controlled by rotating the upper layer, which impacts the symmetry of the charge oscillations across the layers. This tunability enables switching between in- and out-of-phase plasmonic modes, offering a route toward phase-controlled collective excitations. Our results highlight the potential of semi-Dirac systems for plasmonics and interferometric applications in next-generation optoelectronic devices.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRON-ELECTRON; 2-COMPONENT; SEMIMETAL |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group John Schliemann |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jul 2026 09:12 |
| Last Modified: | 15 Jul 2026 09:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66893 |
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