Observation of quantum topological Hall effect in the Weyl semimetal candidate HgSe

Lonchakov, A. T.; Bobin, S. B.; Deryushkin, V. V.; Neverov, V. N.

doi:10.1088/1361-648x/ab2b30

Cited by 13 publications

(13 citation statements)

References 40 publications

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“…The symbols in Figure 6 a show experimental values of

ε_{normalF} false(n_{e} false)

given from refs. [29–31]. Additionally, it should be noted that ε F ≈ 200 meV for sample 4 with n e close to n LT ≈ 2 × 10 18 сm −3 .…”

Section: Resultsmentioning

confidence: 93%

“…These samples were recently studied in refs. [29][30][31], where their basic electronic parameters are presented.…”

Section: Resultsmentioning

confidence: 99%

“…In contrast to InSb, HgSe is known for the inverse band structure, wherein the gap between the highest valence band and the lowest conduction band with the total orbital moment

j = 3 / 2

is identically equal to zero. [ 28 ] However, recent studies [ 29–31 ] strongly indicate the presence in HgSe with a sufficiently low n e of the inversion‐breaking Weyl semimetal (WSM) phase along with trivial gapless phase at the Γ point of the Brillouin zone. This circumstance served as an additional motivation to test the pulsed TR‐FP method on HgSe.…”

Section: Resultsmentioning

confidence: 99%

“…The correlation revealed between

{normalΦ}_{normalB} false(n_{e} false)

and

η (n_{normale})

gives a compelling argument to believe that the origin of the detected

I (t)

anomaly is somehow related to the nontrivial topology of HgSe, which compound was assumed to belong to inversion‐breaking WSMs. [ 29–31 ]…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Laser Pump‐Probe Fiber‐Optic Technique for Characterization of Near‐Surface Layers of Solids: Development and Application Prospects for Studying Semiconductors and Weyl Semimetals

Старостин

Lonchakov

et al. 2020

Annalen der Physik

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A fiber-optic setup incorporating the pump-probe thermoreflectance (TR) technique with Fabry-Perot (FP) interferometer is presented. It includes both heat pump and probe lasers, producing wavelengths of 1470 and 1530 nm, respectively, together with a reflected radiation detector. Heat pump pulse duration varies from a few microseconds to tens of microseconds. The potential of the pump-probe TR-FP technique to investigate the subsurface region of semiconductors with a range of electron spectra is demonstrated. A pronounced dip in time dependence of the TR-FP signal is discovered at the liquid nitrogen temperature in the gapless semiconductor compound HgSe-a candidate for the family of Weyl semimetals with broken inversion symmetry. This finding implies the developed pulsed TR-FP method for the detection of Weyl nodes and surface Fermi arcs in solids.

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“…The symbols in Figure 6 a show experimental values of

ε_{normalF} false(n_{e} false)

given from refs. [29–31]. Additionally, it should be noted that ε F ≈ 200 meV for sample 4 with n e close to n LT ≈ 2 × 10 18 сm −3 .…”

Section: Resultsmentioning

confidence: 93%

“…These samples were recently studied in refs. [29][30][31], where their basic electronic parameters are presented.…”

Section: Resultsmentioning

confidence: 99%

“…In contrast to InSb, HgSe is known for the inverse band structure, wherein the gap between the highest valence band and the lowest conduction band with the total orbital moment

j = 3 / 2

Section: Resultsmentioning

confidence: 99%

“…The correlation revealed between

{normalΦ}_{normalB} false(n_{e} false)

and

η (n_{normale})

gives a compelling argument to believe that the origin of the detected

I (t)

anomaly is somehow related to the nontrivial topology of HgSe, which compound was assumed to belong to inversion‐breaking WSMs. [ 29–31 ]…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Laser Pump‐Probe Fiber‐Optic Technique for Characterization of Near‐Surface Layers of Solids: Development and Application Prospects for Studying Semiconductors and Weyl Semimetals

Старостин

Lonchakov

et al. 2020

Annalen der Physik

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“…On the one hand, Weyl semimetals have been found to exhibit various exciting phenomena, such as the chiral anomaly-induced magnetochiral anisotropy [36,37] and the bulk spin Hall effect [38,39].…”

Section: Introductionmentioning

confidence: 99%

Effects of strong correlations on the nonlinear response in Weyl-Kondo semimetals

Kofuji,

Michishita,

Peters

2021

Preprint

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Nonlinear responses give rise to various exciting phenomena, which are forbidden in linear responses. Among them, one of the most fascinating phenomena is the recently observed giant spontaneous Hall effect in Ce3Bi4Pd3. This material is a promising candidate for a Weyl-Kondo semimetal, and this experiment implies that strong correlation effects can enhance the nonlinear Hall effect. However, most theoretical studies on nonlinear responses have been limited to free systems, and the connection between nonlinear responses and strong correlation effects is poorly understood. Motivated by these experiments and recent theoretical advances to analyze strong correlation effects on the nonlinear response, we study a periodic Anderson model describing Ce3Bi4Pd3 using the dynamical mean-field theory. We calculate the nonlinear longitudinal conductivity and the nonlinear Hall conductivity using the Kubo formula extended to the nonlinear response regime and clarify their temperature dependences. We numerically show that strong correlations can enhance nonlinear conductivities, and we conclude that the magnitude of the experimentally observed giant nonlinear Hall effect can be explained by strong correlation effects.

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Origin of the quasi-quantized Hall effect in ZrTe5

et al. 2021

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The quantum Hall effect (QHE) is traditionally considered to be a purely two-dimensional (2D) phenomenon. Recently, however, a three-dimensional (3D) version of the QHE was reported in the Dirac semimetal ZrTe5. It was proposed to arise from a magnetic-field-driven Fermi surface instability, transforming the original 3D electron system into a stack of 2D sheets. Here, we report thermodynamic, spectroscopic, thermoelectric and charge transport measurements on such ZrTe5 samples. The measured properties: magnetization, ultrasound propagation, scanning tunneling spectroscopy, and Raman spectroscopy, show no signatures of a Fermi surface instability, consistent with in-field single crystal X-ray diffraction. Instead, a direct comparison of the experimental data with linear response calculations based on an effective 3D Dirac Hamiltonian suggests that the quasi-quantization of the observed Hall response emerges from the interplay of the intrinsic properties of the ZrTe5 electronic structure and its Dirac-type semi-metallic character.

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Observation of quantum topological Hall effect in the Weyl semimetal candidate HgSe

Cited by 13 publications

References 40 publications

Laser Pump‐Probe Fiber‐Optic Technique for Characterization of Near‐Surface Layers of Solids: Development and Application Prospects for Studying Semiconductors and Weyl Semimetals

Laser Pump‐Probe Fiber‐Optic Technique for Characterization of Near‐Surface Layers of Solids: Development and Application Prospects for Studying Semiconductors and Weyl Semimetals

Effects of strong correlations on the nonlinear response in Weyl-Kondo semimetals

Origin of the quasi-quantized Hall effect in ZrTe5

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