Topological Lifshitz transition and one-dimensional Weyl mode in HfTe5

Wu, Wenbin; Shi, Zeping; Du, Yuhan; Wang, Yuxiang; Qin, Fang; Meng, Xianghao; Liu, Binglin; Ma, Yuanji; Yan, Zhongbo; Ozerov, Mykhaylo; Zhang, Cheng; Lu, Hai‐Zhou; Chu, Junhao; Yuan, Xiang

doi:10.1038/s41563-022-01364-5

Cited by 12 publications

(9 citation statements)

References 63 publications

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“…The topological property of 3D ZrTe 5 is sensitively dependent on the inter-and intra-layer coupling strengths. ZrTe 5 is located near the boundary of weak topological (WTI) and strong topological insulators (STI) as typical Dirac material 15 , promoting many exotic phenomena [16][17][18][19][20][21][22] . Therefore, the properties of ZrTe 5 are sensitively dependent on crystal growth methods, namely the chemical vapor transfer (CVT) and flux processes.…”

Section: Rashba Splittings and Anomalous Hall Effect In Zrtementioning

confidence: 99%

Rashba-splitting-induced topological flat band detected by anomalous resistance oscillations beyond the quantum limit in ZrTe5

Xing,

Tong,

Pan

et al. 2024

Nat Commun

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Topological flat bands — where the kinetic energy of electrons is quenched — provide a platform for investigating the topological properties of correlated systems. Here, we report the observation of a topological flat band formed by polar-distortion-assisted Rashba splitting in the three-dimensional Dirac material ZrTe5. The polar distortion and resulting Rashba splitting on the band are directly detected by torque magnetometry and the anomalous Hall effect, respectively. The local symmetry breaking further flattens the band, on which we observe resistance oscillations beyond the quantum limit. These oscillations follow the temperature dependence of the Lifshitz–Kosevich formula but are evenly distributed in B instead of 1/B at high magnetic fields. Furthermore, the cyclotron mass gets anomalously enhanced about 102 times at fields ~ 20 T. Our results provide an intrinsic platform without invoking moiré or order-stacking engineering, which opens the door for studying topologically correlated phenomena beyond two dimensions.

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Section: Rashba Splittings and Anomalous Hall Effect In Zrtementioning

confidence: 99%

Rashba-splitting-induced topological flat band detected by anomalous resistance oscillations beyond the quantum limit in ZrTe5

Xing,

Tong,

Pan

et al. 2024

Nat Commun

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“…When the Fermi level shifts through either one, the topology of the Fermi surface varies (Lifshitz transition). Especially, the Fermi surface undergoes a topological Lifshitz transition 58 with its Chern number changing from 0 to ± 1, only if the Fermi level drops through the newly formed saddle point, although the VHS is not topologically protected. More details regarding the topological Lifshitz transition are provided in Supplementary Section XIII.…”

Section: Optical Transitions Assignment and Emergence Of 3d Vhsmentioning

confidence: 99%

“…Thus, the discussed exchange interaction offers a promising mechanism to experimentally realize the 3D VHS. The proposed physics might be detected by magneto-infrared spectroscopy, an effective optical technique to probe the evolution of the electronic states under the magnetic field [53][54][55][56][57][58] .…”

mentioning

confidence: 99%

The discovery of three-dimensional Van Hove singularity

Wu,

Shi,

Ozerov

et al. 2024

Nat Commun

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Arising from the extreme/saddle point in electronic bands, Van Hove singularity (VHS) manifests divergent density of states (DOS) and induces various new states of matter such as unconventional superconductivity. VHS is believed to exist in one and two dimensions, but rarely found in three dimension (3D). Here, we report the discovery of 3D VHS in a topological magnet EuCd2As2 by magneto-infrared spectroscopy. External magnetic fields effectively control the exchange interaction in EuCd2As2, and shift 3D Weyl bands continuously, leading to the modification of Fermi velocity and energy dispersion. Above the critical field, the 3D VHS forms and is evidenced by the abrupt emergence of inter-band transitions, which can be quantitatively described by the minimal model of Weyl semimetals. Three additional optical transitions are further predicted theoretically and verified in magneto-near-infrared spectra. Our results pave the way to exploring VHS in 3D systems and uncovering the coordination between electronic correlation and the topological phase.

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“…For example, an out-of-plane magnetic field would bring transverse velocity to longitudinal moving electrons in the two-dimensional (2D) electronic system, forming the series of discrete bounding states called Landau level. [9][10][11] The Landau level evolves into Landau band with energy dispersion along the magnetic field direction in the three-dimensional (3D) system due to the extra space freedom of electrons. The well-known Landau level and Landau band are direct manifestations of magnetic field induced electronic circular motion, generating a number of fascinating Hall effects with the strong correlation to the underlying physics in different matters.…”

Section: Introductionmentioning

confidence: 99%

Recent progress on the planar Hall effect in quantum materials

Zhong

Zhuang

2023

Chinese Phys. B

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The planar Hall effect (PHE), which originates from anisotropic magnetoresistance, presents a qualitative and simple approach to characterize electronic structures of quantum materials by applying an in-plane rotating magnetic field to induce identical oscillations in both longitudinal and transverse resistance. In this review, we focus on the recent research on the PHE in various quantum materials, including ferromagnetic materials, topological insulators, Weyl semimetals, and orbital anisotropic matters. Firstly, we briefly introduce the family of Hall effect and give a basic deduction of PHE formula with the second-order resistance tensor, showing the mechanism of the characteristic π-period oscillation in trigonometric function form with a $\frac{\pi }{4}$ phase delay between longitudinal and transverse resistance. Then, we will introduce the four main mechanisms to realize PHE in quantum materials. After that, the origin of the anomalous planar Hall effect (APHE) results, of which the curve shapes deviate from that of PHE, will be reviewed and discussed. Finally, the challenges and prospects for this field of study are discussed.

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Topological Lifshitz transition and one-dimensional Weyl mode in HfTe5

Cited by 12 publications

References 63 publications

Rashba-splitting-induced topological flat band detected by anomalous resistance oscillations beyond the quantum limit in ZrTe5

Rashba-splitting-induced topological flat band detected by anomalous resistance oscillations beyond the quantum limit in ZrTe5

The discovery of three-dimensional Van Hove singularity

Recent progress on the planar Hall effect in quantum materials

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