Repulsive van der Waals forces due to hydrogen exposure on bilayer graphene

Boström, Mathias; Sernelius, Bo E.

doi:10.1103/physreva.85.012508

Cited by 23 publications

(19 citation statements)

References 38 publications

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“…First, we did not take into account the effect of the van der Waals potential of the substrate [57,58,59]. It seems that the effect of this potential should be weakened with the increase of number of layers.…”

Section: Discussionmentioning

confidence: 99%

Phase diagram of the Kohn-Luttinger superconducting state for bilayer graphene

2015

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Abstract. The effect of the intersite and interplane Coulomb interactions between the Dirac fermions on the formation of the Kohn-Luttinger superconductivity in bilayer doped graphene is studied disregarding the effects of the van der Waals potential of the substrate and both magnetic and non-magnetic impurities. The phase diagram determining the boundaries of superconductive domains with different types of symmetry of the order parameter is built using the extended Hubbard model in the Born weak-coupling approximation with allowance for the intratomic, interatomic, and interlayer Coulomb interactions between electrons. It is shown that the Kohn-Luttinger polarization contributions up to the second order of perturbation theory in the Coulomb interaction inclusively and an account for the long-range intraplane Coulomb interactions significantly affect the competition between the superconducting f −, p + ip−, and d + id−wave pairings. It is demonstrated that the account for the interplane Coulomb interaction enhances the critical temperature of the transition to the superconducting phase.

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Section: Discussionmentioning

confidence: 99%

Phase diagram of the Kohn-Luttinger superconducting state for bilayer graphene

2015

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“…In most cases, the Casimir force is attractive, and as a result close proximity between materials can lead to unwanted effects due to stiction in micro and nanomechanical systems [2]. Thus, finding ways to reduce the magnitude of the force or even make it repulsive is an important field of research [3][4][5][6][7][8].…”

Section: Pacs Numbers: Valid Pacs Appear Herementioning

confidence: 99%

Temperature dependent graphene suspension due to thermal Casimir interaction

Phan

Woods

Drosdoff

et al. 2012

Applied Physics Letters

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Thermal effects contributing to the Casimir interaction between objects are usually small at room temperature and they are difficult to separate from quantum mechanical contributions at higher temperatures. We propose that the thermal Casimir force effect can be observed for a graphene flake suspended in a fluid between substrates at the room temperature regime. The properly chosen materials for the substrates and fluid induce a Casimir repulsion. The balance with the other forces, such as gravity and buoyancy, results in a stable temperature dependent equilibrium separation. The suspended graphene is a promising system due to its potential for observing thermal Casimir effects at room temperature.

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“…While the practical applicability of this type of repulsion in micro-and nanomechanical devices seems limited, some recent suggestions include repulsion between sheets of graphene upon introducing interspatial hydrogen gas [40].…”

Section: Repulsion Due To Intermediate Materialsmentioning

confidence: 99%

Repulsive Casimir and Casimir–Polder forces

Milton¹,

Abalo²,

Parashar³

et al. 2012

J. Phys. A: Math. Theor.

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Abstract. Casimir and Casimir-Polder repulsion have been known for more than 50 years. The general "Lifshitz" configuration of parallel semi-infinite dielectric slabs permits repulsion if they are separated by a dielectric fluid that has a value of permittivity that is intermediate between those of the dielectric slabs. This was indirectly confirmed in the 1970s, and more directly by Capasso's group recently. It has also been known for many years that electrically and magnetically polarizable bodies can experience a repulsive quantum vacuum force. More amenable to practical application are situations where repulsion could be achieved between ordinary conducting and dielectric bodies in vacuum. The status of the field of Casimir repulsion with emphasis on some recent developments will be surveyed. Here, stress will be placed on analytic developments, especially of Casimir-Polder (CP) interactions between anisotropically polarizable atoms, and CP interactions between anisotropic atoms and bodies that also exhibit anisotropy, either because of anisotropic constituents, or because of geometry. Repulsion occurs for wedge-shaped and cylindrical conductors, provided the geometry is sufficiently asymmetric, that is, either the wedge is sufficiently sharp or the atom is sufficiently far from the cylinder.Casimir Repulsion 2

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Repulsive van der Waals forces due to hydrogen exposure on bilayer graphene

Cited by 23 publications

References 38 publications

Phase diagram of the Kohn-Luttinger superconducting state for bilayer graphene

Phase diagram of the Kohn-Luttinger superconducting state for bilayer graphene

Temperature dependent graphene suspension due to thermal Casimir interaction

Repulsive Casimir and Casimir–Polder forces

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