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Title: Interplay of screening and superconductivity in low-dimensional materials

Journal Article · · Physical Review. B
 [1];  [1];  [2];  [2];  [1]
  1. Univ. of Bremen (Germany). Inst. fuer Theoretische Physik; Univ. of Bremen (Germany). Bremen Center for Computational Materials Science
  2. 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
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (1)

Noninvasive control of excitons in two-dimensional materials journal July 2017