Renormalization group study of systems with quadratic band touching

@article{Shah2020RenormalizationGS,
  title={Renormalization group study of systems with quadratic band touching},
  author={Jeet Shah and Subroto Mukerjee},
  journal={arXiv: Strongly Correlated Electrons},
  year={2020}
}
Lifshitz transitions in two 2D systems with a single quadratic band touching point as the chemical potential is varied have been studied here. The effects of interactions have been studied using the renormalization group (RG) and it is found that at the transition a repulsive interaction is marginally relevant and an attractive interaction is marginally irrelevant. We corroborate the results obtained from the RG calculation by studying a microscopic model whose ground state and Green's… 

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