4.6 Article

Exciton condensate in bilayer transition metal dichalcogenides: Strong coupling regime

期刊

PHYSICAL REVIEW B
卷 96, 期 17, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.174504

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资金

  1. National Science Foundation [NSF EFRI-1433395, ACI-1548562]
  2. FAME, one of six centers of STARnet, a Semiconductor Research Corporation program - MARCO
  3. DARPA

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Exciton condensation in an electron-hole bilayer system of monolayer transition-metal dichalcogenides is analyzed at three different levels of theory to account for screening and quasiparticle renormalization. The large effective masses of the transition metal dichalcogenides place them in a strong coupling regime. In this regime, mean-field (MF) theory with either an unscreened or screened interlayer interaction predicts a room-temperature condensate. Interlayer and intralayer interactions renormalize the quasiparticle dispersion, and this effect is included in a GW approximation. The renormalization reverses the trends predicted from the unscreened or screened MF theories. In the strong coupling regime, intralayer interactions have a large impact on the magnitude of the order parameter and its functional dependencies on effective mass and carrier density.

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