Tunable point nodes from line-node semimetals via application of light

Narayan, Awadhesh

doi:10.1103/physrevb.94.041409

Cited by 65 publications

(51 citation statements)

References 42 publications

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“…For these materials especially, the high-frequency expansion of the Floquet Hamiltonian, equation (14) has proven to be very prolific, because it affords an analytic expression for the dressed Hamiltonian and as such can be readily classified in terms of topology. Thus, there have been proposals for the manipulation of Floquet-topological phases in line-node semimetals [46][47][48], Dirac-semimetals [49][50][51][52] and Weyl-semimetals [53][54][55][56][57] all relying on the effective Hamiltonian description.…”

Section: Photon-driven Floquet Systems 41 Topological Floquet Matermentioning

confidence: 99%

Floquet analysis of excitations in materials

Giovannini

Hübener

2019

J. Phys. Mater.

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Controlled excitation of materials can transiently induce changed or novel properties with many fundamental and technological implications. Especially, the concept of Floquet engineering and the manipulation of the electronic structure via dressing with external lasers have attracted some recent interest. Here we review the progress made in defining Floquet material properties and give a special focus on their signatures in experimental observables as well as considering recent experiments realizing Floquet phases in solid state materials. We discuss how a wide range of experiments with non-equilibrium electronic structure can be viewed by employing Floquet theory as an analysis tool providing a different view of excitations in solids.

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Section: Photon-driven Floquet Systems 41 Topological Floquet Matermentioning

confidence: 99%

Floquet analysis of excitations in materials

Giovannini

Hübener

2019

J. Phys. Mater.

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“…It was proposed in Refs. [24][25][26] that two-band semimetals with a nodal line could be realized through Floquet engineering; such a scenario was recently implemented in ultracold atoms using Raman-induced spinorbit coupling in an optical lattice [27]. Two-band semimetals, as defined in three spatial dimensions, are fully characterized by a Z 2 Berry phase around the nodal line.…”

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confidence: 99%

Floquet-engineering of nodal rings and nodal spheres and their characterization using the quantum metric

Salerno

Goldman

Palumbo

2020

Phys. Rev. Research

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Semimetals exhibiting nodal lines or nodal surfaces represent a novel class of topological states of matter. While conventional Weyl semimetals exhibit momentum-space Dirac monopoles, these more exotic semimetals can feature unusual topological defects that are analogous to extended monopoles. In this work, we describe a scheme by which nodal rings and nodal spheres can be realized in synthetic quantum matter through well-defined periodic-driving protocols. As a central result of our work, we characterize these nodal defects through the quantum metric, which is a gauge-invariant quantity associated with the geometry of quantum states. In the case of nodal rings, where the Berry curvature and conventional topological responses are absent, we show that the quantum metric provides an observable signature for these extended topological defects. Besides, we demonstrate that quantum-metric measurements could be exploited to directly detect the topological charge associated with a nodal sphere. We discuss possible experimental implementations of Floquet nodal defects in few-level atomic systems, paving the way for the exploration of Floquet extended monopoles in quantum matter. arXiv:1912.00930v1 [cond-mat.mes-hall]

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“…Recently, WSMs with timereversal symmetry have been found in the noncentrosymmetric transition-metal monosphides, including TaAs [2,[4][5][6], TaP [7,8], NbP [9] and NbAs [10]. It is also expected that the WSMs with broken time-reversal symmetry also can be implemented by means of the magnetically doping technique [11][12][13][14][15] or applying a beam of off-resonant light [3,[16][17][18][19][20][21][22][23][24] . For example, the Floquet WSMs are reported if a circularly polarized light is applied to nodal line semimetals [3] or 3D Dirac semimetals [17].…”

Section: Introductionmentioning

confidence: 99%

Indirect magnetic interaction mediated by Fermi arc and boundary reflection near Weyl semimetal surface

Duan

Zheng

et al. 2018

New J. Phys.

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We theoretically investigate the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between magnetic impurities distributed in the vicinity of the surface of a Weyl semimetal. Contrary to previous studies, we further take into account the influence of interplay of the Fermi arc and bulk states, and interface refection. It is shown that the RKKY pattern is significantly mediated by the Fermi-arc surface state along with the interface reflection. The Fermi-arc surface state mediates the RKKY interaction by interfering with the bulk states. The resulting interference contribution in the short-range impurity distance R is comparable in magnitude to the bulk-band contribution and even dominates the latter near the surface. It either enhances or weakens the bulk contribution, depending on the relative orientation of impurities and Fermi energy. More importantly, for the long-range impurity distance the interference term dominates in that it can prolong the decay rate from the original bulk R −5 -law to R −2 (R −3 ) for finite (zero) Fermi energy. The interface reflection not only enhances the magnitude of the RKKY interaction and changes its anisotropy from the original XXZ to XYZ or Ising spin model, but also generates extra twisted RKKY terms parallel to the line connecting Weyl nodes, lacked in the scenario without the interface effect. They originate from the interaction between the impurity and the mirror image of the other impurity. We further analyze in detail the spatial anisotropy of the decay rate and beating pattern. These findings provide a deeper insight into surface magnetic interaction mediated by Weyl fermions.anomaly [25,[30][31][32], negative magnetoresistance [33][34][35], and untraditional superconductivity [36,37]. Another remarkable topological property of WSMs is the existence of topologically protected surface states. The surface states in k-space form Fermi arc, connecting the Weyl nodes projected to the surface Brillouin zone. Different from the gapless surface state of topological insulators, which inhabits within the bulk band gap and is depart from the bulk sates, the Fermi-arc surface states in WSMs are directly connected to the bulk states. Consequently, the surface properties of WSMs are contributed by both the bulk and surface states. To detect the Fermi arc, many literatures have focused on specific impurity scattering, such as quasiparticle interference (or Friedel oscillations) [38][39][40][41] and Kondo effect [42,43], and other interesting transport properties. However, the magnetic properties with respect to Fermi-arc states receive no attention.Introduction of magnetic impurities to Dirac materials opens up the possibility for their application potential in spintronics. Among magnetic impurities, the effective magnetic interaction mediated by the electrons of host material, namely the Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction [44], is crucial for magnetic ordering of the impurities. The nature of the RKKY interaction is determined by the dispersion and magnetic texture in h...

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Tunable point nodes from line-node semimetals via application of light

Cited by 65 publications

References 42 publications

Floquet analysis of excitations in materials

Floquet analysis of excitations in materials

Floquet-engineering of nodal rings and nodal spheres and their characterization using the quantum metric

Indirect magnetic interaction mediated by Fermi arc and boundary reflection near Weyl semimetal surface

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