Josephson effect in graphene bilayers with adjustable relative displacement

• URL: http://arxiv.org/abs/2009.10730v2
• Date: Mon, 19 Oct 2020 10:04:50 GMT
• Title: Josephson effect in graphene bilayers with adjustable relative displacement
• Authors: Mohammad Alidoust, Antti-Pekka Jauho, and Jaakko Akola
• Abstract summary: Josephson current is investigated in a superconducting graphene bilayer where pristine graphene sheets can make in-plane or out-of-plane displacements with respect to each other. Results demonstrate that the supercurrent responds qualitatively differently to relative displacement if the superconductivity is due to either intralayer or interlayer spin-singlet electron-electron pairing.
• Score: 0.0
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: The Josephson current is investigated in a superconducting graphene bilayer where pristine graphene sheets can make in-plane or out-of-plane displacements with respect to each other. The superconductivity can be of an intrinsic nature, or due to a proximity effect. The results demonstrate that the supercurrent responds qualitatively differently to relative displacement if the superconductivity is due to either intralayer or interlayer spin-singlet electron-electron pairing, thus providing a tool to distinguish between the two mechanisms. Specifically, both the AA and AB stacking orders are studied with antiferromagnetic spin alignment. For the AA stacking order with intralayer and on-site pairing no current reversal is found. In contrast, the supercurrent may switch its direction as a function of the in-plane displacement and out-of-plane interlayer coupling for the cases of AA ordering with interlayer pairing and AB ordering with either intralayer or interlayer pairing. In addition to sign reversal, the Josephson signal displays many characteristic fingerprints which derive directly from the pairing mechanism. Thus, measurements of the Josephson current as a function of the graphene bilayer displacement open up the means achieve deeper insights into the superconducting pairing mechanism.

Related papers

• Fragmented superconductivity in the Hubbard model as solitons in Ginzburg-Landau theory [58.720142291102135]
  Superconductivity and charge density waves are observed in close vicinity in strongly correlated materials. We investigate the nature of such an intertwined state of matter stabilized in the phase diagram of the elementary $t$-$tprime$-$U$ Hubbard model. We provide conclusive evidence that the macroscopic wave functions of the superconducting fragments are well-described by soliton solutions of a Ginzburg-Landau equation.
  arXiv  Detail & Related papers  (2023-07-21T18:00:07Z)
• Thermopower in hBN/graphene/hBN superlattices [46.287853697580566]
  We experimentally study thermopower in high-quality monolayer graphene within heterostructures consisting of complete hBN encapsulation and 1D edge contacts. We show that the temperature dependence of the thermopower enables the assessment of the role of built-in strain variation and van Hove singularities. We show the same superlattice device can exhibit a temperature-driven thermopower reversal from positive to negative and vice versa, by controlling the carrier density.
  arXiv  Detail & Related papers  (2023-06-14T19:06:34Z)
• Topological Superconductivity in Two-Dimensional Altermagnetic Metals [1.779681639954815]
  We study the effect of altermagnetism on the superconductivity of a two-dimensional metal with d-wave altermagnetism and Rashba spin-orbital coupling. We show that a number of topological superconductors, including both first-order and second-order ones, can emerge when the p-wave pairing dominates.
  arXiv  Detail & Related papers  (2023-05-17T18:00:00Z)
• Higher-order topological Peierls insulator in a two-dimensional atom-cavity system [58.720142291102135]
  We show how photon-mediated interactions give rise to a plaquette-ordered bond pattern in the atomic ground state. The pattern opens a non-trivial topological gap in 2D, resulting in a higher-order topological phase hosting corner states. Our work shows how atomic quantum simulators can be harnessed to investigate novel strongly-correlated topological phenomena.
  arXiv  Detail & Related papers  (2023-05-05T10:25:14Z)
• Flat-band-induced superconductivity in synthetic bilayer optical lattices [0.0]
  A synthetic version of twisted bilayers can be engineered with cold atoms in optical lattices. We investigate the superconducting behavior of fermionic atoms in such a synthetic twisted bilayer lattice.
  arXiv  Detail & Related papers  (2022-07-26T16:23:32Z)
• Superfluid drag between excitonic polaritons and superconducting electron gas [0.0]
  The Andreev-Bashkin effect, or superfluid drag, is predicted in a system of Bose-condensed excitonic polaritons in optical microcavity. The predicted nondissipative drag could be strong enough to be observable as induction of a supercurrent in the electronic layer by a flow of polariton Bose condensate.
  arXiv  Detail & Related papers  (2022-04-22T15:04:46Z)
• Emergent intersubband-plasmon-polaritons of Dirac electrons under one-dimensional superlattices [0.0]
  We show that an extreme modulation of one-dimensional (1D) SL potentials in monolayer graphene deforms the underlying Dirac band dispersion. This results in emergent intersubband polaritonic responses in optical conductivity. Our study opens up an avenue for exploring emergent polaritons in two-dimensional materials with gate-tunable electronic band structures.
  arXiv  Detail & Related papers  (2022-03-25T18:18:27Z)
• Electromagnetically induced transparency in inhomogeneously broadened divacancy defect ensembles in SiC [52.74159341260462]
  Electromagnetically induced transparency (EIT) is a phenomenon that can provide strong and robust interfacing between optical signals and quantum coherence of electronic spins. We show that EIT can be established with high visibility also in this material platform upon careful design of the measurement geometry. Our work provides an understanding of EIT in multi-level systems with significant inhomogeneities, and our considerations are valid for a wide array of defects in semiconductors.
  arXiv  Detail & Related papers  (2022-03-18T11:22:09Z)
• Quantum correlations, entanglement spectrum and coherence of two-particle reduced density matrix in the Extended Hubbard Model [62.997667081978825]
  We study the ground state properties of the one-dimensional extended Hubbard model at half-filling. In particular, in the superconducting region, we obtain that the entanglement spectrum signals a transition between a dominant singlet (SS) to triplet (TS) pairing ordering in the system.
  arXiv  Detail & Related papers  (2021-10-29T21:02:24Z)
• Engineering the Radiative Dynamics of Thermalized Excitons with Metal Interfaces [58.720142291102135]
  We analyze the emission properties of excitons in TMDCs near planar metal interfaces. We find suppression or enhancement of emission relative to the point dipole case by several orders of magnitude. nanoscale optical cavities are a viable pathway to generating long-lifetime exciton states in TMDCs.
  arXiv  Detail & Related papers  (2021-10-11T19:40:24Z)
• Interplay between singlet and triplet pairings in multi-band two-dimensional oxide superconductors [0.0]
  We study the superconducting properties of multi-band two-dimensional transition metal oxide superconductors. The interplay between the singlet and the triplet pairings affects the dispersion of quasi-particle excitations in the Brillouin zone. Non-trivial topological superconducting states become stable as a function of the charge density.
  arXiv  Detail & Related papers  (2021-07-02T14:27:55Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.