Coulomb drag between a carbon nanotube and monolayer graphene
ORAL
Abstract
We develop a theory of frictional drag that takes into account the non-conservation of two-dimensional momentum in electron bilayers consisting of Coulomb coupled subsystems of different dimensionality [1]. Similar systems recently are implemented experimentally [2,3], stimulating further experimental and theoretical research.
Here we show that the dimensional mismatch of the system components leads to a qualitatively new physical picture of Coulomb drag. Adopting the Fermi liquid theory, we calculate the drag resistivity between a spatially separated carbon nanotube (either metallic, both armchair and zigzag, or semiconducting zigzag) and a graphene monolayer. Our calculations are restricted to the low temperature regime. We find that the drag dependence on the carrier density, temperature (T), and spacing (d) differs substantially from that known for symmetric double layers. For example, in hybrid systems with metallic nanotubes at low T and large d, we find a resistivity proportional to Tα and d-β with α≈3.7 and a T-dependent transition 2<β<3 instead of the known exponents α≈2 and β≈4 for symmetric graphene sheets.
Our research paves the way for the study of new phenomena in various physical settings caused by the interplay of the fundamental properties of electron systems, dimensionality and interaction.
[1] S. M. Badalyan and A. P. Jauho, Phys. Rev. Res. 2, 013086 (2020).
[2] L. Anderson et al., Phys. Rev. Lett. 127, 257701 (2021).
[3] R. Mitra et al., Phys. Rev. Lett. 124, 116803 (2020).
Here we show that the dimensional mismatch of the system components leads to a qualitatively new physical picture of Coulomb drag. Adopting the Fermi liquid theory, we calculate the drag resistivity between a spatially separated carbon nanotube (either metallic, both armchair and zigzag, or semiconducting zigzag) and a graphene monolayer. Our calculations are restricted to the low temperature regime. We find that the drag dependence on the carrier density, temperature (T), and spacing (d) differs substantially from that known for symmetric double layers. For example, in hybrid systems with metallic nanotubes at low T and large d, we find a resistivity proportional to Tα and d-β with α≈3.7 and a T-dependent transition 2<β<3 instead of the known exponents α≈2 and β≈4 for symmetric graphene sheets.
Our research paves the way for the study of new phenomena in various physical settings caused by the interplay of the fundamental properties of electron systems, dimensionality and interaction.
[1] S. M. Badalyan and A. P. Jauho, Phys. Rev. Res. 2, 013086 (2020).
[2] L. Anderson et al., Phys. Rev. Lett. 127, 257701 (2021).
[3] R. Mitra et al., Phys. Rev. Lett. 124, 116803 (2020).
Presenters
-
SAMVEL M BADALYAN
- Center for Graphene Research