Topological Superconductivity in Two-Dimensional Altermagnetic Metals

• URL: http://arxiv.org/abs/2305.10479v2
• Date: Mon, 6 Nov 2023 04:09:50 GMT
• Title: Topological Superconductivity in Two-Dimensional Altermagnetic Metals
• Authors: Di Zhu, Zheng-Yang Zhuang, Zhigang Wu, Zhongbo Yan
• Abstract summary: 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.
• Score: 1.779681639954815
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Bringing magnetic metals into superconducting states represents an important approach for realizing unconventional superconductors and potentially even topological superconductors. Altermagnetism, classified as a third basic collinear magnetic phase, gives rise to intriguing momentum-dependent spin-splitting of the band structure, and results in an even number of spin-polarized Fermi surfaces due to the symmetry-enforced zero net magnetization. In this work, we investigate the effect of this new magnetic order on the superconductivity of a two-dimensional metal with d-wave altermagnetism and Rashba spin-orbital coupling. Specifically we consider an extended attractive Hubbard interaction, and determine the types of superconducting pairing that can occur in this system and ascertain whether they possess topological properties. Through self-consistent mean-field calculations, we find that the system in general favors a mixture of spin-singlet s-wave and spin-triplet p-wave pairings, and that the altermagnetism is beneficial to the latter. Using symmetry arguments supported by detailed calculations, we show that a number of topological superconductors, including both first-order and second-order ones, can emerge when the p-wave pairing dominates. In particular, we find that the second-order topological superconductor is enforced by a $\mathcal{C}_{4z}\mathcal{T}$ symmetry, which renders the spin polarization of Majorana corner modes into a unique entangled structure. Our study demonstrates that altermagnetic metals are fascinating platforms for the exploration of intrinsic unconventional superconductivity and topological superconductivity.

Related papers

• Superfluid Stiffness and Flat-Band Superconductivity in Magic-Angle Graphene Probed by cQED [0.32018750515900324]
  Superconductivity in magic-angle twisted bilayer graphene (MATBG) is a topic of keen interest in moir'e systems research. We use DC-transport and microwave circuit quantum electrodynamics to measure directly the superfluid stiffness of MATBG. Our findings indicate that MATBG is an unconventional superconductor with an anisotropic gap and strongly suggest a connection between quantum geometry, superfluid stiffness, and unconventional superconductivity.
  arXiv  Detail & Related papers  (2024-06-19T18:00:02Z)
• 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)
• Imaging magnetism evolution of magnetite to megabar pressure range with quantum sensors in diamond anvil cell [57.91882523720623]
  We develop an in-situ magnetic detection technique at megabar pressures with high sensitivity and sub-microscale spatial resolution. We observe the macroscopic magnetic transition of Fe3O4 in the megabar pressure range from strong ferromagnetism (alpha-Fe3O4) to weak ferromagnetism (beta-Fe3O4) and finally to non-magnetism (gamma-Fe3O4) The presented method can potentially investigate the spin-orbital coupling and magnetism-superconductivity competition in magnetic systems.
  arXiv  Detail & Related papers  (2023-06-13T15:19:22Z)
• Chiral superconductivity in the doped triangular-lattice Fermi-Hubbard model in two dimensions [0.0]
  We first locate the transition from the metallic to the non-magnetic insulating phase and the onset of magnetic order. Our results pave the way towards a better understanding of strongly correlated lattice systems with magnetic frustration.
  arXiv  Detail & Related papers  (2022-10-24T19:10:12Z)
• Quantum phase transition in magnetic nanographenes on a lead superconductor [21.166883497183687]
  Quantum spins are proposed to host exotic interactions with superconductivity. Magnetic nanographenes have been proven to host intrinsic quantum magnetism due to their negligible spin orbital coupling and crystal field splitting. We fabricate three atomically precise nanographenes with the same magnetic ground state of spin S=1/2 on Pb (111) through engineering sublattice imbalance in graphene honeycomb lattice.
  arXiv  Detail & Related papers  (2022-07-12T04:52:02Z)
• Measuring the magnon-photon coupling in shaped ferromagnets: tuning of the resonance frequency [50.591267188664666]
  cavity photons and ferromagnetic spins excitations can exchange information coherently in hybrid architectures. Speed enhancement is usually achieved by optimizing the geometry of the electromagnetic cavity. We show that the geometry of the ferromagnet plays also an important role, by setting the fundamental frequency of the magnonic resonator.
  arXiv  Detail & Related papers  (2022-07-08T11:28:31Z)
• A hybrid ferromagnetic transmon qubit: circuit design, feasibility and detection protocols for magnetic fluctuations [45.82374977939355]
  We show that the characteristic hysteretic behavior of the ferromagnetic barrier provides an alternative and intrinsically digital tuning of the qubit frequency by means of magnetic field pulses. The possibility to use the qubit as a noise detector and its relevance to investigate the subtle interplay of magnetism and superconductivity is envisaged.
  arXiv  Detail & Related papers  (2022-06-01T18:50:26Z)
• Relativistic aspects of orbital and magnetic anisotropies in the chemical bonding and structure of lanthanide molecules [60.17174832243075]
  We study the electronic and ro-vibrational states of heavy homonuclear lanthanide Er2 and Tm2 molecules by applying state-of-the-art relativistic methods. We were able to obtain reliable spin-orbit and correlation-induced splittings between the 91 Er2 and 36 Tm2 electronic potentials dissociating to two ground-state atoms.
  arXiv  Detail & Related papers  (2021-07-06T15:34:00Z)
• 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)
• Spin Entanglement and Magnetic Competition via Long-range Interactions in Spinor Quantum Optical Lattices [62.997667081978825]
  We study the effects of cavity mediated long range magnetic interactions and optical lattices in ultracold matter. We find that global interactions modify the underlying magnetic character of the system while introducing competition scenarios. These allow new alternatives toward the design of robust mechanisms for quantum information purposes.
  arXiv  Detail & Related papers  (2020-11-16T08:03:44Z)
• Realization of a Bosonic Antiferromagnet [6.2669932229958345]
  We create a one-dimensional Heisenberg antiferromagnet with ultracold bosons. Compared with condensed matter systems, ultracold gases in optical lattices can be microscopically engineered and measured.
  arXiv  Detail & Related papers  (2020-09-03T03:08:04Z)

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.