Magnetic-tunnelling-induced Weyl node annihilation in TaP

Chenglong, Zhang; Xu, Su-Yang; Wang, C. M.; Lin, Ziquan; Du, Z. Z.; Guo, Cheng; Lee, Chi-Cheng; Lu, Hong; Feng, Yi‐Si; Huang, Shin-Ming; Chang, Guoqing; Hsu, Chuang‐Han; Liu, Haiwen; Lin, Hsin; Li, Liang; Zhang, Chi; Zhang, Jinglei; Xie, X. C.; Neupert, Titus; Hasan, M. Zahid; Lu, Hai‐Zhou; Wang, Junfeng; Jia, Shuang

doi:10.1038/nphys4183

Cited by 88 publications

(68 citation statements)

References 30 publications

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“…A second surprise is that the exponential rise in resistivity saturates at low temperature and the saturated resistivity decreases at even higher field strength (B ∼ 80 T) [7]. Gap opening has also been suggested in other Weyl materials such as TaP [8] and previous numerical studies also support similar ideas [9,10].…”

Section: Introductionsupporting

confidence: 52%

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Emergence of gapped bulk and metallic side walls in the zeroth Landau level in Dirac and Weyl semimetals

Chan

Lee

2017

Phys. Rev. B

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Recent transport experiments have revealed the activation of longitudinal magnetoresistance of Weyl semimetals in the quantum limit, suggesting the breakdown of chiral anomaly in a strong magnetic field. Here we provide a general mechanism for gapping the zeroth chiral Landau levels applicable for both Dirac and Weyl semimetals. Our result shows that the zeroth Landau levels anticross when the magnetic axis is perpendicular to the Dirac/Weyl node separation and when the inverse magnetic length l −1 B is comparable to the node separation scale k. The induced bulk gap increases rapidly beyond a threshold field in Weyl semimetals, but has no threshold and is nonmonotonic in Dirac systems due to the crossover between l −1 B > k and l −1 B < k regions. We also find that the Dirac and possibly Weyl systems host counterpropagating edge states between the zeroth Landau levels, leading to a state with metallic side walls and zero Hall conductance.

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Section: Introductionsupporting

confidence: 52%

“…As discussed in Ref. [8], the crossing spectrum opens a gap when the inverse magnetic length scale l −1 B becomes comparable to k W . We show below that this anticrossing is a consequence of the hybridization of zeroth LLs by nonlinear ladder operator couplings in the Hamiltonian.…”

Section: Introductionmentioning

confidence: 99%

Emergence of gapped bulk and metallic side walls in the zeroth Landau level in Dirac and Weyl semimetals

Chan

Lee

2017

Phys. Rev. B

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“…When either the time-reversal symmetry or the inversion symmetry is broken, the degenerate Dirac nodes in a Dirac semimetal will separate into Weyl nodes, resulting in a Weyl semimetal phase. While inversion-symmetrybroken Weyl semimetals were realized in noncentrosymmetric monosphides from the TaAs family [31][32][33], stable timereversal symmetry-broken Weyl semimetals without coupling to orbital motion and spin through Landau quantization and Zeeman splitting are still being sought. An external magnetic field or magnetic doping can implement the breaking of the time-reversal symmetry.…”

Section: Introductionmentioning

confidence: 99%

Cr doping induced negative transverse magnetoresistance in Cd3As2 thin films

et al. 2018

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The magnetoresistance of a material conveys various dynamic information about charge and spin carriers, inspiring both fundamental studies in physics and practical applications such as magnetic sensors, data storage, and spintronic devices. Magnetic impurities play a crucial role in the magnetoresistance as they induce exotic states of matter such as the quantum anomalous Hall effect in topological insulators and tunable ferromagnetic phases in dilute magnetic semiconductors. However, magnetically doped topological Dirac semimetals are hitherto lacking. Here, we report a systematic study of Cr-doped Cd 3 As 2 thin films grown by molecular-beam epitaxy. With the Cr doping, Cd 3 As 2 thin films exhibit unexpected negative transverse magnetoresistance and strong quantum oscillations, bearing a trivial Berry's phase and an enhanced effective mass. More importantly, with ionic gating the magnetoresistance of Cr-doped Cd 3 As 2 thin films can be drastically tuned from negative to positive, demonstrating the strong correlation between electrons and the localized spins of the Cr impurities, which we interpret through the formation of magnetic polarons. Such a negative magnetoresistance under perpendicular magnetic field and its gate tunability have not been observed previously in the Dirac semimetal Cd 3 As 2 . The Cr-induced topological phase transition and the formation of magnetic polarons in Cd 3 As 2 provide insights into the magnetic interaction in Dirac semimetals as well as their potential applications in spintronics.

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“…Specifically, we add in Eqs. (5,6) a confining potential V c (X) that depends only on X ≡ x cos θ + z sin θ. For simplicity, we take the system is translationally symmetric along the y-direction, so that −i ∂ y in Eqs.…”

Section: Effect Of Titled Magnetic Field On Topological Surface mentioning

confidence: 99%

“…For simplicity, we take the system is translationally symmetric along the y-direction, so that −i ∂ y in Eqs. (5,6) is replaced by k y . This gives out…”

Section: Effect Of Titled Magnetic Field On Topological Surface mentioning

confidence: 99%

Ground-state atlas of a three-dimensional semimetal in the quantum limit

Pan

Shindou

2019

Phys. Rev. B

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An interplay between electron correlation and reduced dimensionality due to the Landau quantization gives rise to exotic electronic phases in three-dimensional semimetals under high magnetic field. Using an unbiased theoretical method, we clarify for the first time comprehensive ground-state phase diagrams of a three-dimensional semimetal with a pair of electron and hole pockets in the quantum limit. For the electron interaction, we consider either screened Coulomb repulsive interaction or an attractive electron-electron interaction mediated by a screened electron-phonon coupling, where a screening length is generally given by a dimensionless constant times magnetic length l. By solving the parquet RG equation numerically and employing a mean-field argument, we construct comprehensive ground-state phase diagrams of the semimetal in the quantum limit for these two cases, as a function of the Fermi wave length and the screening length (both normalized by l). In the repulsive interaction case, the ground state is either excitonic insulator (EI) in strong screening regime or Ising-type spin density wave in weak screening regime. In the attractive interaction case, the ground state is either EI that breaks the translational symmetries (strong screening regime), topological EI, charge Wigner crystal (intermediate screening regime), plain charge density wave or marginal Fermi liquid (weak screening regime). We show that the topological EI supports a single copy of massless Dirac fermion at its side surface, and thereby exhibit a √ H ⊥ -type surface Shubnikov-de Haas (SdH) oscillation in in-plane surface transports as a function of a canted magnetic field H ⊥ . Armed with these theoretical knowledge, we discuss implications of recent transport experiments on graphite under the high field.

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Magnetic-tunnelling-induced Weyl node annihilation in TaP

Cited by 88 publications

References 30 publications

Emergence of gapped bulk and metallic side walls in the zeroth Landau level in Dirac and Weyl semimetals

Emergence of gapped bulk and metallic side walls in the zeroth Landau level in Dirac and Weyl semimetals

Cr doping induced negative transverse magnetoresistance in Cd3As2 thin films

Ground-state atlas of a three-dimensional semimetal in the quantum limit

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