期刊
NEW JOURNAL OF PHYSICS
卷 21, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/ab2f30
关键词
graphene nonlinearities; ponderomotive force; nonlocal response
资金
- MULTIPLY fellowship under the Marie Sklodowska-Curie COFUND Action [713694]
- University of Southern Denmark (SDU)
- VILLUM Fonden [16498]
- Danish National Research Foundation [DNRF103]
We analyze intrinsic nonlinearities in two-dimensional (2D) polaritonic materials interacting with an optical wave. Focusing on the case of graphene, we show that the second-order nonlinear optical conductivity due to carrier density fluctuations associated with the excitation of a plasmon polariton is closely related to the ponderomotive force due to the oscillating optical field. A recent study (Sun et al 2018 Proc. Natl Acad. Sci. USA 115 3285-9) derived this force in the hydrodynamic regime of a generic Dirac fluid, and suggested that inclusion of interband transitions could have interesting implications. Here we reproduce the Drude-like result in a more general fashion on the basis of thermodynamics, which makes extension to other regimes straightforward. We find that for zero temperature a diverging nonlinearity is found at the interband threshold. By including finite-temperature effects this is regularized, but remains quite significant even at room temperature. Going further beyond, we include nonlocal corrections as a second potential source of regularization, and find that they do not lead to broadening (as one would usually expect e.g. due to Landau damping), but rather to a splitting of the ponderomotive interband resonance, providing a very characteristic signature of nonlocality. Our analysis should prove useful to the open quest for exploiting nonlinearities in graphene and other 2D polaritonic materials, through effects such as photon drag.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据