Nonlocal optical response in topological phase transitions in the graphene family
- Inst. de Ciencia de Materiales de Madrid, Madrid (Spain). Materials Science Factory; Univ. of South Florida, Tampa, FL (United States). Dept. of Physics; GISC-Grupo Interdisciplinar de Sistemas Complejos, Madrid (Spain)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of South Florida, Tampa, FL (United States). Dept. of Physics
We investigate the electromagnetic response of staggered two-dimensional materials of the graphene family, including silicene, germanene, and stanene, as they are driven through various topological phase transitions using external fields. Utilizing Kubo formalism, we compute their optical conductivity tensor taking into account the frequency and wave vector of the electromagnetic excitations, and study its behavior over the full electronic phase diagram of the materials. In particular, we find that the resonant behavior of the nonlocal Hall conductivity is strongly affected by the various topological phases present in these materials. We also consider the plasmon excitations in the graphene family and find that nonlocality in the optical response can affect the plasmon dispersion spectra of the various phases. Here, we find a regime of wave vectors for which the plasmon relations for phases with trivial topology are essentially indistinguishable, while those for phases with nontrivial topology are distinct and are redshifted as the corresponding Chern number increases. Finally, the expressions for the conductivity components are valid for the entire graphene family and can be readily used by others.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- AC52-06NA25396; FG02-06ER46297
- OSTI ID:
- 1431075
- Alternate ID(s):
- OSTI ID: 1417711
- Report Number(s):
- LA-UR-17-30514; PRMHAR; TRN: US1802643
- Journal Information:
- Physical Review Materials, Vol. 2, Issue 1; ISSN 2475-9953
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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