Unraveling the Topological Phase of 
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 via Magnetoinfrared Spectroscopy

Jiang, Yuxuan; Wang, J.; Zhao, Tianhao; Dun, Zhiling; Huang, Qi; Wu, Xiaosong; Mourigal, Martin; Zhou, H. D.; Pan, W.; Ozerov, Mykhaylo; Smirnov, Dmitry; Jiang, Zhigang

doi:10.1103/physrevlett.125.046403

Cited by 31 publications

(37 citation statements)

References 42 publications

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“…Thus, we model this system in a three-band approximation, including the Dirac electrons and holes, and quadratic CB pocket. For the Dirac-cone dispersion, magneto-optic measurements [5] are consistent with approximately quadratic dispersion along k b , and linear in other directions, while other recent work [6,41] also points to a non-Dirac dispersion along k b . To include the effect of a flatter k b dispersion, we compare the limiting cases of a 3D linear Dirac cone, and the quasi-2D case with no dispersion along k b .…”

supporting

confidence: 54%

“…From the Hamiltonian parameters quoted in Ref. [23], we calculate an energy dispersion of about 10 meV over the range of the filled N ¼ 0 þ states, and the proposed flatter k b dispersion [5,6,41] implies a situation closer to quasi-2D discrete Landau levels. Thus, our sample is within the quantum limit in the 9 T measuring field, with only the N ¼ 0 þ level occupied at low temperatures in the absence of interactions.…”

mentioning

confidence: 83%

“…These include the chiral magnetic effect [2] and the 3D quantum Hall effect (3DQHE) [3]. Anomalous thermoelectric effects in the quantum limit [4] are also possibly connected to the unusual dispersion behavior [5,6], and ZrTe 5 also shows the emergence of multiple superconducting phases under high pressure [7]. It is now clear that there is a temperaturedriven topological phase transition associated with its wellknown resistance anomaly [8][9][10].…”

mentioning

confidence: 99%

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Gap-Opening Transition in Dirac Semimetal ZrTe5

2021

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We apply 125 Te nuclear magnetic resonance (NMR) spectroscopy to investigate the Dirac semimetal ZrTe 5 . With the NMR magnetic field parallel to the b axis, we observe significant quantum magnetic effects. These include an abrupt drop at 150 K in spin-lattice relaxation rate. This corresponds to a gapopening transition in the Dirac carriers, likely indicating the onset of excitonic pairing. Below 50 K, we see a more negative shift for the Te z bridging site, indicating the repopulation of Dirac levels with spin polarized carriers at these temperatures. This is the previously reported 3D quantum Hall regime; however, we see no sign of a charge density wave as has been proposed.

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confidence: 54%

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confidence: 83%

mentioning

confidence: 99%

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Gap-Opening Transition in Dirac Semimetal ZrTe5

2021

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“…Motivated by these progresses, in this paper, we make a detailed study on the proposed gapped Dirac semimetal model [23] as well as on how to characterize the bulk electronic states. We calculate the density of states (DOS) and the interband optical conductivity, with the influence of the impurity scatterings being included phenomenologically.…”

Section: Introductionmentioning

confidence: 99%

“…The red lines denote the phase boundaries at which the Dirac points are reduced to lie at the Γ point. The asterisks label the parameters used in the following calculations, and the triangle labels the parameters extracted from the experiment [23]. The Dirac mass is taken as M = 7.5 meV.…”

Section: Introductionmentioning

confidence: 99%

Gapped Dirac semimetal with mixed linear and parabolic dispersions

Wang

2021

Phys. Rev. B

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In this paper, we make a comprehensive study of the properties of a gapped Dirac semimetal model, which was originally proposed in the magnetoinfrared spectroscopy measurement of ZeTe5, and includes both the linear and parabolic dispersions in all three directions. We find that, depending on the band inversion parameters, ζ and ζ z , the model can support three different phases: the single Dirac point (DP) phase, the double DPs phase and the Dirac ring phase. The three different phases can be distinguished by their low-energy features in the density of states (DOS) and optical conductivity. At high energy, both the DOS and optical conductivity exhibit power-law like behaviors, with the asymptotic exponents depending heavily on the signs of ζ and ζ z . Moreover, the thumb-of-rule formula between the DOS and optical conductivity is satisfied only when (ζ , ζ z ) > 0. The implications of our results for experiments are discussed.

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The Anomalous Photo‐Nernst Effect of Massive Dirac Fermions In HfTe₅

Singh,

Kiemle,

et al. 2023

Advanced Physics Research

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The quantum geometric Berry curvature results in an anomalous correction to the band velocity of crystal electrons with a corresponding transverse (thermo)electric conductivity. However, time‐reversal symmetry typically constrains the direct observation and exploitation of anomalous transport to magnetic compounds. Here, it is demonstrated the anomalous Hall and Nernst conductivities are essential for describing the optoelectronic transport in thin films of the non‐magnetic, weakly gapped semimetal HfTe5 subject to an external magnetic field. A focused photoexcitation adresses the symmetries of the local Nernst conductivity, which unveils a hitherto hidden, anomalous photo‐Nernst effect of three‐dimensional (3D) massive Dirac fermions. The experimental temperature and density dependencies are compared with a semiclassical Boltzmann transport model. For HfTe5 thin films with the Fermi level close to the gap, the model suggests that the anomalous photo‐Nernst currents originate from an intrinsic Berry curvature mechanism, where the Zeeman interaction effectively breaks time‐reversal symmetry of the massive Dirac fermions already at moderate external magnetic fields.

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Unraveling the Topological Phase of ZrTe5 via Magnetoinfrared Spectroscopy

Cited by 31 publications

References 42 publications

Gap-Opening Transition in Dirac Semimetal ZrTe5

Gap-Opening Transition in Dirac Semimetal ZrTe5

Gapped Dirac semimetal with mixed linear and parabolic dispersions

The Anomalous Photo‐Nernst Effect of Massive Dirac Fermions In HfTe₅

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Unraveling the Topological Phase of ZrTe5 via Magnetoinfrared Spectroscopy

Cited by 31 publications

References 42 publications

Gap-Opening Transition in Dirac Semimetal ZrTe5

Gap-Opening Transition in Dirac Semimetal ZrTe5

Gapped Dirac semimetal with mixed linear and parabolic dispersions

The Anomalous Photo‐Nernst Effect of Massive Dirac Fermions In HfTe5

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The Anomalous Photo‐Nernst Effect of Massive Dirac Fermions In HfTe₅