Local Probes for Charge-Neutral Edge States in Two-Dimensional Quantum Magnets

• URL: http://arxiv.org/abs/2007.07912v1
• Date: Wed, 15 Jul 2020 18:00:03 GMT
• Title: Local Probes for Charge-Neutral Edge States in Two-Dimensional Quantum Magnets
• Authors: Johannes Feldmeier, Willian Natori, Michael Knap, Johannes Knolle
• Abstract summary: We propose spin-polarized scanning tunneling microscopy as a spin-sensitive local probe to provide direct information about charge neutral topological edge states. As our main example, we determine the dynamical spin correlations of the Kitaev honeycomb model with open boundaries. We show that by contrasting conductance measurements of bulk and edge locations, one can extract direct signatures of the existence of fractionalized excitations and non-trivial topology.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The bulk-boundary correspondence is a defining feature of topological states of matter. However, for quantum magnets such as spin liquids or topological magnon insulators a direct observation of topological surface states has proven challenging because of the charge-neutral character of the excitations. Here we propose spin-polarized scanning tunneling microscopy as a spin-sensitive local probe to provide direct information about charge neutral topological edge states. We show how their signatures, imprinted in the local structure factor, can be extracted by specifically employing the strengths of existing technologies. As our main example, we determine the dynamical spin correlations of the Kitaev honeycomb model with open boundaries. We show that by contrasting conductance measurements of bulk and edge locations, one can extract direct signatures of the existence of fractionalized excitations and non-trivial topology. The broad applicability of this approach is corroborated by a second example of a kagome topological magnon insulator.

Related papers

• Chiral polaron formation on the edge of topological quantum matter [0.0]
  We study the dressing of a mobile impurity interacting with a chiral mode, as provided by the edge of topological quantum matter. The resulting ''chiral polaron'' is characterized by an asymmetric spectral function. Injecting mobile impurities on the edge of topological quantum matter is shown to be a powerful tool to probe exotic edge properties.
  arXiv  Detail & Related papers  (2024-07-26T21:18:39Z)
• Unveiling Higher-Order Topology via Polarized Topological Charges [5.234883704077005]
  We propose an experimentally observable momentum-space characterization to the chiral-symmetric HOTPs by the concept of polarized topological charges. Remarkably, these polarized topological charges can be identified by measuring the pseudospin structures. Our work opens an avenue for characterization and experimental detection of the chiral-symmetric HOTPs in momentum space.
  arXiv  Detail & Related papers  (2024-05-09T02:25:55Z)
• 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)
• 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)
• Chiral Pseudo Spin Liquids in Moire Heterostructures [0.0]
  We propose multi-layer moire structures in strong external magnetic fields as a novel platform for realizing frustrated Hubbard physics with topological order. We identify the layer degree of freedom as a pseudo spin and control ring-exchange processes and concurrently quenching the kinetic energy by large external magnetic fields. We find that this topologically ordered state remains exceptionally stable towards relevant perturbations.
  arXiv  Detail & Related papers  (2022-09-12T18:00:10Z)
• Accessing the topological Mott insulator in cold atom quantum simulators with realistic Rydberg dressing [58.720142291102135]
  We investigate a realistic scenario for the quantum simulation of such systems using cold Rydberg-dressed atoms in optical lattices. We perform a detailed analysis of the phase diagram at half- and incommensurate fillings, in the mean-field approximation. We furthermore study the stability of the phases with respect to temperature within the mean-field approximation.
  arXiv  Detail & Related papers  (2022-03-28T14:55:28Z)
• Dispersive readout of molecular spin qudits [68.8204255655161]
  We study the physics of a magnetic molecule described by a "giant" spin with multiple $d > 2$ spin states. We derive an expression for the output modes in the dispersive regime of operation. We find that the measurement of the cavity transmission allows to uniquely determine the spin state of the qudits.
  arXiv  Detail & Related papers  (2021-09-29T18:00:09Z)
• Anomalous in-gap edge states in two-dimensional pseudospin-1 Dirac insulators [0.0]
  Quantum materials that host a flat band, such as pseudospin-1 lattices and magic-angle twisted bilayer graphene, can exhibit drastically new physical phenomena. We report a surprising class of electronic in-gap edge states in pseudospin-1 materials. In particular, we find that, in two-dimensional gapped (insulating) Dirac systems of massive spin-1 quasiparticles, in-gap edge modes can emerge through only an em electrostatic potential applied to a finite domain.
  arXiv  Detail & Related papers  (2020-05-20T16:44:19Z)
• Majorana bound states in topological insulators with hidden Dirac points [25.488181126364186]
  We show that well-defined Majorana bound states can be obtained even in materials with hidden Dirac point. The obtained topological phase diagram allows one to extract precisely the position of the Dirac point in the spectrum.
  arXiv  Detail & Related papers  (2020-04-22T15:04:39Z)
• Dynamical solitons and boson fractionalization in cold-atom topological insulators [110.83289076967895]
  We study the $mathbbZ$ Bose-Hubbard model at incommensurate densities. We show how defects in the $mathbbZ$ field can appear in the ground state, connecting different sectors. Using a pumping argument, we show that it survives also for finite interactions.
  arXiv  Detail & Related papers  (2020-03-24T17:31:34Z)
• Probing chiral edge dynamics and bulk topology of a synthetic Hall system [52.77024349608834]
  Quantum Hall systems are characterized by the quantization of the Hall conductance -- a bulk property rooted in the topological structure of the underlying quantum states. Here, we realize a quantum Hall system using ultracold dysprosium atoms, in a two-dimensional geometry formed by one spatial dimension. We demonstrate that the large number of magnetic sublevels leads to distinct bulk and edge behaviors.
  arXiv  Detail & Related papers  (2020-01-06T16:59:08Z)

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.