Abstract
Coulomb drag in double layer graphene systems separated by an h-BN interlayer allows probing of the electron-electron interactions in the effective limit of zero layer separation. Although these interactions can be influenced by plasmons, phonons and exchange and correlation effects, these excitations have never been studied altogether, missing the effects of their coupling on the drag physics. Here we study theoretically the effects of these quasiparticles and their coupling, including also the effects of the electronic exchange and correlation, and demonstrate that the drag resistivity can attain a maximum value at room temperature and beyond, where hybridized plasmon-phonon modes contribute significantly. In particular, the hybridization of the plasmons with the hyperbolic phonons of h-BN, confined within the reststrahlen bands, enhance the drag resistivity. This study paves the way for the exploration of novel many-body physics phenomena in systems coupled through emerging 2D hyperbolic materials.
Highlights
Coulomb drag in double layer graphene systems separated by an hexagonal boron nitride (h-BN) interlayer allows probing of the electron-electron interactions in the effective limit of zero layer separation
We show the effect of the hyperbolic phonons of the h-BN interlayer on the drag resistivity, which has never been discussed so far according to our knowledge
A transport-dominated regime, with τ >> τee, is assumed, where τ and τee are, respectively, the carrier transport and the electron–electron interaction times. h-BN is an anisotropic wide bandgap insulator whose in- and out-of-plane frequencydependent relative permittivities, εxðωÞ and εzðωÞ respectively, have opposite sign in the two reststrahlen bands, supporting a series of hyperbolic phonon modes that are confined within these bands[36,41]
Summary
Coulomb drag in double layer graphene systems separated by an h-BN interlayer allows probing of the electron-electron interactions in the effective limit of zero layer separation. In the case when phonons of h-BN are not considered, Fig. 3e, the drag intensity is markedly enhanced due to the contribution from the optical and acoustic plasmon modes in the interband region.
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