Interplay of screening and superconductivity in low-dimensional materials
- Univ. of Bremen (Germany). Inst. fuer Theoretische Physik; Univ. of Bremen (Germany). Bremen Center for Computational Materials Science
- Univ. of Southern California, Los Angeles, CA (United States)
A quantitative description of Coulomb interactions is developed for two-dimensional superconducting materials, enabling us to compare intrinsic with external screening effects, such as those due to substrates. Therefore, using the example of a doped monolayer of MoS2 embedded in a tunable dielectric environment, we demonstrate that the influence of external screening is limited to a length scale, bounded from below by the effective thickness of the quasi-two-dimensional material and from above by its intrinsic screening length. As a consequence, it is found that unconventional Coulomb-driven superconductivity cannot be induced in MoS2 by tuning the substrate properties alone. Our calculations of the retarded Morel-Anderson Coulomb potential μ* reveal that the Coulomb interactions, renormalized by the reduced layer thickness and the substrate properties, can shift the onset of the electron-phonon driven superconducting phase in monolayer MoS2 but do not significantly affect the critical temperature at optimal doping.
- Research Organization:
- Univ. of Southern California, Los Angeles, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- FG02-05ER46240
- OSTI ID:
- 1535772
- Alternate ID(s):
- OSTI ID: 1328518
- Journal Information:
- Physical Review. B, Vol. 94, Issue 13; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Noninvasive control of excitons in two-dimensional materials
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journal | July 2017 |
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Electron-phonon coupling
electronic structure
superconductivity
transition temperature
2-dimensional systems
doped semiconductors
heterostructures
transition-metal dichalcogenide
density functional calculations
Eliashberg theory
GW method
methods in superconductivity