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Electromagnetic modes from Stoner enhancement: Graphene as a case study

Jalali Mola, Z ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jmmm.2018.09.040
  3. Publisher: Elsevier B.V , 2019
  4. Abstract:
  5. In systems with substantial spin fluctuations, dressing the polarization function by ladder diagram of Stoner (spin-flip) excitations can drastically modify the electromagnetic response. As a case study, we provide the detailed analysis of the corrections to the non-local optical conductivity of both doped and undoped graphene. While the resummation of ladder diagram of Stoner excitations does not affect the TE mode in doped graphene, it allows for a new undamped TM mode in undoped graphene. This is the sole effect of corrections arising from ladder diagrams and is dominated by Stoner excitations along the ladder rung which goes away by turning off the source of spin-flip interactions. In the case of doped graphene, the inclusion of spin-flip particle-hole fluctuations reduces the energy of plasmon mode. © 2018 Elsevier B.V
  6. Keywords:
  7. Graphene ; Ladder resummation ; Stoner enhancement ; Ladders ; Optical conductivity ; Electromagnetic modes ; Electromagnetic response ; Ladder diagram ; Plasmon modes ; Polarization functions ; Resummation ; Spin-flip interactions ; Stoner excitations ; Spin fluctuations
  8. Source: Journal of Magnetism and Magnetic Materials ; Volume 471 , 2019 , Pages 220-235 ; 03048853 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S030488531830564X