Light control with Weyl semimetals

Guo, Cheng; Asadchy, Viktar; Zhao, Bo; Fan, Shanhui

doi:10.1186/s43593-022-00036-w

Cited by 73 publications

(19 citation statements)

References 294 publications

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“…When the energy dispersion has genuine doubly degenerate Dirac cones, they can be made separated into two chirally distinct cones by introducing a chiral or time-reversal breaking element. Among material that posses such feature, are Weyl semimetals [37][38][39][40][41]-a type of gapless topological matter with distinctive features including a large negative magnetoresistance [42][43][44][45] and an anomalous Hall response [46,47]. The chiral element in Weyl semimetals, which separates the otherwise degenerate cones, appears in the low energy description as the additional term d 4 xb µ j µ 5 in the action functional with b µ being constant.…”

Section: Measurable Consequencesmentioning

confidence: 99%

On the path integral approach to quantum anomalies in interacting models

Parhizkar¹,

Rylands²,

Galitski³

2023

Preprint

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The prediction and subsequent discovery of topological semimetal phases of matter in solid state systems has instigated a surge of activity investigating the exotic properties of these unusual materials. Amongst these are transport signatures which can be attributed to the chiral anomaly; the breaking of classical chiral symmetry in a quantum theory. This remarkable quantum phenomenon, first discovered in the context of particle physics has now found new life in condensed matter physics, connecting topological quantum matter and band theory with effective field theoretic models. In this paper we investigate the interplay between interactions and the chiral anomaly in field theories inspired by semimetals using Fujikawa's path integral method. Starting from models in one spatial dimension we discuss how the presence of interactions can affect the consequences of the chiral anomaly leading to renormalization of excitations and their transport properties. This is then generalised to the three dimensional case where we show that the anomalous response of the system, namely the chiral magnetic and quantum hall effects, are modified by the presence of interactions. These properties are investigated further through the identification of anomalous modes which exist within interacting Weyl semimetals. These massive excitations are nonperturbative in nature and are a direct consequence of the chiral anomaly. The effects of interactions on mixed axial-gravitational anomalies are then investigated and the conditions required for interactions effects to be observed are discussed.

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Section: Measurable Consequencesmentioning

confidence: 99%

On the path integral approach to quantum anomalies in interacting models

Parhizkar¹,

Rylands²,

Galitski³

2023

Preprint

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“…In terms of practicality, the magneto-optic case in Figure c,d requires a modest applied magnetic field of B = 0.2T, and a nonreciprocal absorber/emitter was recently demonstrated with the magneto-optic InAs under the external magnetic field of 1T . In contrast, the first TRS-breaking WSM was only experimentally demonstrated recently and, to date, the prediction of nonreciprocal optical behavior in these materials is in the early stages of experimental demonstration. , The experimental demonstration of Fizeau drag in 3D WSM/DSM will not require an externally applied magnetic field or corresponding equipment and will also draw on a wider selection of I-symmetry-breaking DSM and WSM material candidates that may be less vulnerable to the synthesis challenges involved with working with TRS-breaking WSM materials.…”

Section: Discussionmentioning

confidence: 99%

“…Another emerging alternative for nonreciprocal optical devices, which requires neither an external magnetic field nor ultrafast modulation, is based on making use of the excitation of surface plasmon polariton (SPP) modes at the interfaces of Weyl semimetals (WSMs). − WSMs are topological materials with a distinct electronic bandstructure, which supports pairs of nondegenerate, chiral Weyl nodes formed from intersecting, linearly dispersing bands. WSMs must be either inversion symmetry (I) or time-reversal symmetry (TRS) breaking, or both, to achieve the nondegenerate bandstructure.…”

Section: Introductionmentioning

confidence: 99%

Plasmon Fizeau Drag in 3D Dirac and Weyl Semimetals

Blevins,

Boriskina

2024

ACS Photonics

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There is a need for compact, dynamically tunable, nonreciprocal optical elements to enable on-chip-compatible optical isolators and more efficient radiative energy transfer systems. Plasmon Fizeau drag, the drag of an electrical current on propagating surface plasmon polaritons (SPPs), has been proposed to induce nonreciprocal surface modes to enable one-way energy transport. However, relativistic electron drift velocities are required to induce an appreciable contrast between the dispersion characteristics of copropagating and counter-propagating surface plasmon modes. The high electron drift velocity of graphene previously allowed for the experimental demonstration of current-induced nonreciprocity in a two-dimensional (2D) Dirac material. The high electron drift and Fermi velocities in three-dimensional (3D) Dirac materials make them ideal candidates for the effect; however, both the theory of the Fizeau drag effect and its experimental demonstrations in 3D Dirac materials are missing. Here, we develop a comprehensive theory of Fizeau drag in DC-biased 3D Weyl semimetals (WSMs) or Dirac semimetals (DSMs), both under local and nonlocal approximation and with dissipative losses. We predict that under practical assumptions for loss, Fizeau drag in the DSM Cd3As2 opens windows of pseudounidirectional transport. We additionally introduce new figures of merit to rank nonreciprocal plasmonic systems by their potential for directional SPP transport. Further, we propose a new approach for achieving appreciable plasmonic Fizeau drag via optically pumping bulk inversion symmetry-breaking WSMs or DSMs.

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“…Recently, it has been found that WSM showed stronger nonreciprocity at MIR wavelengths without external magnetic fields, which results in a great enhancement in nonreciprocal thermal radiation. [43][44][45][46][47][48][49] The objective of the present work is the comprehensive characterization of the hybrid PhP modes in the Otto heterostructure including their dispersion, spectral response and field distribution. The considered system is composed of a sandwiched construction with air/aluminium nitride (AlN)/WSM/ silver (Ag) and a coupling prism.…”

Section: Introductionmentioning

confidence: 99%