Nonlinear optical control of chiral charge pumping in a topological Weyl semimetal

Jadidi, Majid; Kargarian, Mehdi; Mittendorff, Martin; Aytac, Yigit; Shen, Bing; König-Otto, Jacob C.; Winnerl, Stephan; Ni, Ni; Gaeta, Alexander L.; Murphy, Thomas E.; Drew, H. D.

doi:10.1103/physrevb.102.245123

Cited by 22 publications

(19 citation statements)

References 39 publications

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“…This would pump charge from one Weyl point to its neighbor of opposite chirality, raising the chemical potential of one point with respect to the other and splitting the single onset at the quantum limit into two. Such charge pumping is known as the chiral anomaly of Weyl Fermions (18,(25)(26)(27)(28). Previous measurements of this effect relied on DC transport, which suffered from ambiguity due to other possible trivial effects (29)(30)(31).…”

Section: Discussionmentioning

confidence: 99%

Weyl Fermion magneto-electrodynamics and ultralow field quantum limit in TaAs

Lu¹,

Hollister²,

Ozerov³

et al. 2022

Sci. Adv.

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Section: Discussionmentioning

confidence: 99%

Weyl Fermion magneto-electrodynamics and ultralow field quantum limit in TaAs

Lu¹,

Hollister²,

Ozerov³

et al. 2022

Sci. Adv.

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“…1(b)]. Such relaxation times are longer than the relaxation times of order 0.25 ps − 3 ps that have been mostly reported experimentally to date [37][38][39][40], although some experiments report signatures with much longer lifetimes [41,42] that can even exceed 1 nanosecond [43].…”

mentioning

confidence: 86%

“…The requirements on the relaxation rate pose the biggest current challenge to realizing topological frequency conversion. Relaxation times in known Weyl semimetals have been reported to be in the range 0.25 − 3ps [37][38][39]41], although transient signatures with lifetimes above 100 [41,42] and 1000 [43] ps have also been reported in some compounds. Thus further improvements in the quality of materials are needed to fulfill the requirements of topological frequency conversation in the practically interesting THz range.…”

Section: Condition On Relaxationmentioning

confidence: 99%

Topological frequency conversion in Weyl semimetals

Nathan¹,

Martin²,

Refael³

2022

Preprint

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FIG. 2. (a): Energy bands of the linearized Hamiltonian in Eq. (1) in the plane ky = 0, with ε0 = 0, Rij = δij3.87 • 10 5 m/s, and v = (0, 0, 3.1 • 10 5 m/s). The red line shows an example of the Fermi surface (with Fermi energy −115 meV) when projected into the same plane. (b): Trajectory of eA(t)/ resulting from two modes with circular polarization in the xz and yz planes with amplitudes E1 = 0.74 MV/m, E2 = 1 MV/m and frequencies, f2 = 1, THz, f1 = √ 5−1 2 f2 (blue). Also shown is the surface B0 (gray). See main text for further details. (c): Cross-section of B0 for the same parameters as in (b). Within the red and blue sub-surfaces W (k) takes value 1 and −1, respectively, while W (k) = 0 outside the surface. (d): Trajectory of eA(t)/ for the same values of E2 and f2 as in (b), and with E1 = 0.72 MV/m, f1 = 2 3 f2 (resulting in a commenusrate frequency ratio). The different value of E1 is chosen to ensure that the vector potential of mode 1 has the same amplitude in panels (b) and (d), such that the topological phase boundary B0 is the same for panels (b-d).

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“…Here, λG ∼ √ leelei and λG,5 ∼ leelei,5 are Gurzhi and chiral Gurzhi lengths, respectively, where lei, lei,5, lee are the intra-node, inter-node, and electron-electron scattering lengths. Since the intra-node electron-impurity scattering length is usually smaller than the inter-node one [40,41], i.e., lei ≪ lei,5, the regime λG λG,5 (gray shaded region) cannot be realized.…”

Section: Phenomenology Of the Anomalous Gurzhi Effectmentioning

confidence: 99%

“…Since the rate of the bulk internode scattering processes that relax the chiral charge is usually much smaller than that for the intra-node ones, see, e.g., Refs. [40,41], we expect that the anomalous Gurzhi effect should be easier to realize than the standard Gurzhi effect. As for the optimal experimental conditions, the anomalous Gurzhi effect might be observable in a clean film of a Weyl or Dirac semimetal subject to a magnetic field applied along the surface of the film.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Gurzhi effect

Sukhachov,

Trauzettel

2021

Preprint

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We investigate the role of the chiral anomaly in hydrodynamic and crossover regimes of transport in a Weyl or Dirac semimetal film. We show that the magnetic-field-dependent part of the electric conductivity in the direction of the magnetic field develops an unusual nonmonotonic dependence on temperature dubbed anomalous Gurzhi effect. This effect is realized in sufficiently clean semimetals subject to a classically-weak magnetic field where the electron-electron scattering dominates and the relaxation of the valley-imbalance charge density happens at the boundaries. Moreover, the conditions for the realization of the conventional Gurzhi effect in hydrodynamic and crossover regimes of transport in three-dimensional Dirac and Weyl semimetals are determined.

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Nonlinear optical control of chiral charge pumping in a topological Weyl semimetal

Cited by 22 publications

References 39 publications

Weyl Fermion magneto-electrodynamics and ultralow field quantum limit in TaAs

Weyl Fermion magneto-electrodynamics and ultralow field quantum limit in TaAs

Topological frequency conversion in Weyl semimetals

Anomalous Gurzhi effect

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