Nodal-link semimetals

Yan, Zhongbo; Bi, Ren; Shen, Huitao; Lü, Ling; Zhang, Shou-Cheng; Wang, Zhong

doi:10.1103/physrevb.96.041103

Cited by 292 publications

(218 citation statements)

References 134 publications

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“…While the former class includes topological insulators and superconductors, but also quantum Hall states [5][6][7], the latter class concerns topological semimetals (e.g. Weyl, Dirac and nodal-line semimetals), which have been intensively investigated in the recent years [8][9][10][11][12][13][14][15][16][17][18]; besides, topological phases with nodal surfaces have also been theoretically proposed [19][20][21][22][23]. These gapless systems can display remarkable properties, such as Fermi arcs or drumhead surface states on the boundaries, and momentum-space Dirac monopoles in the bulk.…”

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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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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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“…For example, entanglement has been realized in experiments with microscopic systems including atoms [7][8][9], ions [10,11] and photons [12,13]. For macroscopic systems, entanglement between an optical field and a macroscopic vibrating mirror has been shown to be generated by radiation pressure [14][15][16][17][18][19][20][21]. Meanwhile, entanglement between different mechanical oscillators has also been studied in various optomechanical systems [22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Photon-assisted entanglement and squeezing generation and decoherence suppression via a quadratic optomechanical coupling

Zhang¹,

Wang²

2020

Opt. Express

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Entanglement and quantum squeezing have wide applications in quantum technologies due to their non-classical characteristics. Here we study entanglement and quantum squeezing in an open spin-optomechanical system, in which a Rabi model (a spin coupled to the mechanical oscillator) is coupled to an ancillary cavity field via a quadratic optomechanical coupling. We find that their performances can be significantly modulated via the photon of the ancillary cavity, which comes from photon-dependent spin-oscillator coupling and detuning. Specifically, a fully switchable spinoscillator entanglement can be achieved, meanwhile a strong mechanical squeezing is also realized. Moreover, we study the environment-induced decoherence and dissipation, and find that they can be mitigated by increasing the number of photons. This work provides an effective way to manipulate entanglement and quantum squeezing and to suppress decoherence in the cavity quantum electrodynamics with a quadratic optomechanics.

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“…As for NLSMs, their band crossing points either take the form of an extended line running across the BZ, whose ends meet at the BZ boundary, or wind into a closed loop inside the BZ, or even form a chain consisting of several connected loops (nodal chain) [34,35]. There are also nodal net semimetals [36], nodal-link semimetals [37], and nodal-knot semimetals [38] proposed theoretically. So far, three types of symmetry protected mechanisms for NLSMs have been proposed: (i) mirror reflection symmetry protected NSLMs [39,40]; (ii) NLSMs derives from combined protection of time reversal symmetry and space inversion symmetry [22,23,[41][42][43][44][45][46]; (iii) NLSMs determined by non-symmorphic space group with glide plane or screw axes symmetries [27,47].…”

Section: Introductionmentioning

confidence: 99%

New type of hybrid nodal line semimetal in Be₂Si

Wang

Zhou

et al. 2019

New J. Phys.

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Following Dirac and Weyl semimetals, nodal line semimetals represent a new type of topological semimetal and attracted extensive interest in modern condensed matter physics. Recently, a kind of hybrid nodal lines have been proposed (Zhang et al 2018 Phys.Rev. B 97 125143) and it mainly come from anisotropy interaction. Based on the first-principle calculations and k·p model, we predict a cubic Be 2 Si with topological nontrivial electronic states exhibiting fascinating type-I and type-II hybrid nodal line around Fermi level. Unexpectedly the low energy electronic states of Be 2 Si are isotropy in k x and k y directions and a new effective model has been proposed for the appearance of this new type hybrid nodal line. The four-fold degenerated type-I and type-II nodal points in the hybrid nodal lines along the high symmetry lines of Γ-K and Γ-X are protected by mirror reflection, time reversal and space inversion symmetry. The spin-orbit coupling effect only induces slight band gap in the hybrid nodal lines in Be 2 Si whose nontrivial nature remains. Moreover, the nontrivial hybrid nodal lines in Be 2 Si are robust to external strain. The results in present work indicate that Be 2 Si are promising candidates for future experimental studies of nontrivial topological semimetals and an excellent platform to study the interaction between the two types Dirac fermions.

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Nodal-link semimetals

Cited by 292 publications

References 134 publications

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

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

Photon-assisted entanglement and squeezing generation and decoherence suppression via a quadratic optomechanical coupling

New type of hybrid nodal line semimetal in Be₂Si

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Nodal-link semimetals

Cited by 292 publications

References 134 publications

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

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

Photon-assisted entanglement and squeezing generation and decoherence suppression via a quadratic optomechanical coupling

New type of hybrid nodal line semimetal in Be2Si

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Product

Resources

About

New type of hybrid nodal line semimetal in Be₂Si