Topological magnetic excitations

Malki, M.; Uhrig, Götz S.

doi:10.1209/0295-5075/132/20003

Cited by 41 publications

(24 citation statements)

References 189 publications

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“…[23,165,170,213] A number of theoretical proposals may now be realized in this class of materials ranging from emerging spin-orbit coupling over topological surface states to nonabelian computing schemes. [103,165,[167][168][169]201,[214][215][216][217][218][219][220][221][222]…”

Section: Magnon Pseudospin Dynamics In Afismentioning

confidence: 99%

All‐Electrical Magnon Transport Experiments in Magnetically Ordered Insulators

Althammer

2021

Physica Rapid Research Ltrs

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Angular momentum transport is one of the cornerstones of spintronics. Spin angular momentum is not only transported by mobile charge carriers but also by the quantized excitations of the magnetic lattice in magnetically ordered systems. In this regard, magnetically ordered insulators (MOIs) provide a platform for magnon spin transport experiments without additional contributions from spin currents carried by mobile electrons. In combination with charge‐to‐spin current conversion processes in conductors with finite spin–orbit coupling, it is possible to realize all‐electrical magnon transport schemes in thin‐film heterostructures. Herein, an insight into such experiments and recent breakthroughs achieved is provided. Special attention is given to charge‐current‐based manipulation via an adjacent normal metal of magnon transport in MOIs in terms of spin‐transfer torque. Moreover, the influence of two magnon modes with opposite spin in antiferromagnetic insulators on all‐electrical magnon transport experiments is discussed.

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Section: Magnon Pseudospin Dynamics In Afismentioning

confidence: 99%

All‐Electrical Magnon Transport Experiments in Magnetically Ordered Insulators

Althammer

2021

Physica Rapid Research Ltrs

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“…Magnon band structures can realize analogs of e.g. Chern insulators and topological semimetals [10][11][12] and can host both Dirac [7,8,15] or Weyl magnons [16][17][18][19][20], as well as exhibit extended nodal degeneracies [15,21,22] and triply-degenerate points [23]. Consequently magnetic systems can also exhibit phenomena similar to those found in topological electronic materials, for example a magnon thermal Hall effect arising from gapped bands with topologically non-trivial Chern numbers [24][25][26][27][28][29].…”

mentioning

confidence: 99%

“…The electronic structure of Graphene established it as the prototypical example of a fermionic Dirac material [1,3]. It was subsequently realized that related physics can occur in systems with bosonic quasiparticles including among others phonons [4], photons [5,6], and more recently, magnons [7][8][9][10][11][12]. The interesting topological features of magnon bands are often associated with band degeneracies that can be understood as a consequence of symmetries describable by spin-space groups [13,14].…”

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confidence: 99%

Dirac magnons, nodal lines, and nodal plane in elemental gadolinium

Scheie,

Laurell,

McClarty

et al. 2021

Preprint

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We investigate the magnetic excitations of elemental gadolinium (Gd) using inelastic neutron scattering, showing that Gd is a Dirac magnon material with nodal lines at K and nodal planes at half integer . We find an anisotropic intensity winding around the K-point Dirac magnon cone, which is interpreted to indicate Berry phase physics. Using linear spin wave theory calculations, we show the nodal lines have non-trivial Berry phases, and topological surface modes. Together, these results indicate a highly nontrivial topology, which is generic to hexagonal close packed ferromagnets. We discuss potential implications for other such systems.

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“…In recent years, a new subfield of magnonics called topological magnonics is developing rapidly. Research in this field is focused on the novel characteristics of topological nontrivial magnon modes 58,60,64,125,177,178 . In the view of theory, topological magnonics can provide a new access to help people understanding the topological nontrivial phenomena of magnonic systems in condensed matter, such as Dirac magnons, Weyl magnons and higher-order topological magnons 92,[179][180][181][182][183][184][185] .…”

Section: Perspective 5-1 Topological Phases and Their Evolutionmentioning

confidence: 99%

Hybrid quantum systems based on magnonics

Lachance-Quirion

Tabuchi

Gloppe

et al. 2019

Appl. Phys. Express

626

413

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Engineered quantum systems enabling novel capabilities for communication, computation, and sensing have blossomed in the last decade. Architectures benefiting from combining distinct and complementary physical quantum systems have emerged as promising platforms for developing quantum technologies. A new class of hybrid quantum systems based on collective spin excitations in ferromagnetic materials has led to the diverse set of experimental platforms which are outlined in this review article. The coherent interaction between microwave cavity modes and collective spin-wave modes is presented as the backbone of the development of more complex hybrid quantum systems. Indeed, quanta of excitation of the spin-wave modes, called magnons, can also interact coherently with optical photons, phonons, and superconducting qubits in the fields of cavity optomagnonics, cavity magnomechanics, and quantum magnonics, respectively. Notably, quantum magnonics provides a promising platform for performing quantum optics experiments in magnetically-ordered solid-state systems. Applications of hybrid quantum systems based on magnonics for quantum information processing and quantum sensing are also outlined briefly.

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Topological magnetic excitations

Cited by 41 publications

References 189 publications

All‐Electrical Magnon Transport Experiments in Magnetically Ordered Insulators

All‐Electrical Magnon Transport Experiments in Magnetically Ordered Insulators

Dirac magnons, nodal lines, and nodal plane in elemental gadolinium

Hybrid quantum systems based on magnonics

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