Journal
PHYSICAL REVIEW B
Volume 97, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.235446
Keywords
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Funding
- Fundacao para a Ciencia e Tecnologia (FCT) [PD/BI/129220/2017, PD/BD/135019/2017]
- European Commission within the project Graphene-Driven Revolutions in ICT and Beyond [696656]
- Portuguese Foundation for Science and Technology (FCT) [UID/FIS/04650/2013]
- Fundação para a Ciência e a Tecnologia [PD/BD/135019/2017, PD/BI/129220/2017] Funding Source: FCT
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In this work, the difficulties inherent to perturbative calculations in the velocity gauge are addressed. In particular, it is shown how calculations of nonlinear optical responses in the independent particle approximation can be done to any order and for any finite band model. The procedure and advantages of the velocity gauge in such calculations are described. The addition of a phenomenological relaxation parameter is also discussed. As an illustration, the nonlinear optical response of monolayer graphene is numerically calculated using the velocity gauge.
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