PerspectiveSolid-State Physics

Squeezing strong correlations from graphene

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Science  08 Mar 2019:
Vol. 363, Issue 6431, pp. 1035-1036
DOI: 10.1126/science.aaw4642

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The arrangement of atoms in solids and molecules, together with the resulting distribution of electrons within them, dictates many of their physical properties. However, emergent phenomena may arise when solids or molecules are combined to form superstructures. A prime example is the ability to stack atomically thin two-dimensional (2D) crystals into heterostructures (1). Such van der Waals (vdW) heterostructures enable tailoring of electronic properties through control over the twist angle between layers. On page 1059 of this issue, Yankowitz et al. (2) show that applying pressure to modify the interlayer separation of a twisted bilayer graphene device provides a second control parameter to tune between regimes with strong and weak electronic interactions in a single sample.