Research Article

The role of electron-electron interactions in two-dimensional Dirac fermions

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Science  10 Aug 2018:
Vol. 361, Issue 6402, pp. 570-574
DOI: 10.1126/science.aao2934

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Computers tease out interaction effects

Although graphene is often thought of as a material in which electron-electron interactions are negligible, some of its properties cannot be explained by such a simple picture. Tang et al. undertook comprehensive quantum Monte Carlo numerical calculations that consider both long-range and contact interactions in systems that, like graphene, have two-dimensional (2D) Dirac electrons. Different 2D Dirac materials systems, such as topological insulators and graphene on various substrates, reside in different parts of the resulting phase diagram.

Science, this issue p. 570