Nonsymmorphic symmetry-protected band crossings in a square-net metal PtPb4

Wu, Han‐Qing; Hallas, Alannah; Cai, Xiaochan; Huang, Jianwei; Oh, Ji Seop; Loganathan, Vaideesh; Weiland, Ashley; McCandless, Gregory T.; Chan, Julia Y.; Mo, Sung‐Kwan; Lü, Donghui; Hashimoto, Makoto; Denlinger, Jonathan D.; Birgeneau, R. J.; Nevidomskyy, Andriy H.; Li, Gang; Morosan, Emilia; Yi, Ming

doi:10.1038/s41535-022-00441-x

Cited by 19 publications

(5 citation statements)

References 49 publications

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“…Bulk TaCoTe 2 has a van-der-Waals-type structure with individual monolayers stacked along the [001] crystallographic direction (Figure a) with non-symmorphic symmetry − (see the Supporting Information for details of growth and characterization). The crystal structure belongs to the monoclinic space group P 2 1 / c (number 14) and gives rise to the constant energy surfaces in reciprocal space shown in panels c and d of Figure .…”

mentioning

confidence: 99%

Discovery of a Magnetic Dirac System with a Large Intrinsic Nonlinear Hall Effect

et al. 2023

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Magnetic materials exhibiting topological Dirac fermions are attracting significant attention for their promising technological potential in spintronics. In these systems, the combined effect of the spin−orbit coupling and magnetic order enables the realization of novel topological phases with exotic transport properties, including the anomalous Hall effect and magneto-chiral phenomena. Herein, we report experimental signature of topological Dirac antiferromagnetism in TaCoTe 2 via angle-resolved photoelectron spectroscopy and first-principles density functional theory calculations. In particular, we find the existence of spin−orbit coupling-induced gaps at the Fermi level, consistent with the manifestation of a large intrinsic nonlinear Hall conductivity. Remarkably, we find that the latter is extremely sensitive to the orientation of the Neél vector, suggesting TaCoTe 2 as a suitable candidate for the realization of non-volatile spintronic devices with an unprecedented level of intrinsic tunability.

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confidence: 99%

Discovery of a Magnetic Dirac System with a Large Intrinsic Nonlinear Hall Effect

et al. 2023

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“…where s is the oscillator strength, R is the molar Boltzmann constant, and θ D is the Debye temperature. The parameters extracted from the least-squares fit between T = 25 -265K is s = 3.007 (8) and θ D = 182.8(4) K respectively. The total oscillator strength is in reasonable agreement with the total number of atoms per formula unit in NdSb 0.48 Te 1.37 .…”

Section: B Magnetic Measurements and Specific Heatmentioning

confidence: 99%

“…In the search for new topological matter, materials with a square-net structural motif have been heavily studied as a popular platform to host topological electronic states. [1][2][3][4][5][6][7][8] The p x and p y orbitals that contribute much of the bonding in the square-net yield band structures with multiple topological band crossings, and thus the materials have been found to host Dirac, Weyl, and nodal line topological semimetals (TSMs), as well as topological insulators [9][10][11]. From a chemical standpoint, the bonding within the square net can be described as "hypervalent", which means that it is delocalized over the square net, as the electrons occupy an exactly half-filled p x /p y band.…”

Section: Introductionmentioning

confidence: 99%

Charge density wave-templated spin cycloid in topological semimetal $NdSb_{x}Te_{2-x-δ}$

Salters¹,

Orlandi²,

Berry³

et al. 2023

Preprint

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Magnetic topological semimetals present open questions regarding the interplay of crystal symmetry, magnetism, band topology, and electron correlations. LnSb x Te 2−x−δ (Ln= lanthanide) is a family of square-net-derived topological semimetals that allows compositional control of band filling, and access to different topological states via an evolving charge density wave (CDW) distortion. Previously studied Gd and Ce members containing a CDW have shown complex magnetic phase diagrams, which implied that spins localized on Ln interact with the CDW, but to this date, no magnetic structures have been solved within the CDW regime of this family of compounds.Here, we report on the interplay of the CDW with magnetism in NdSb x Te 2−x−δ , by comparing the undistorted square net member NdSb 0.94 Te 0.92 with the CDW-distorted phase NdSb 0.48 Te 1.37 , via single-crystal x-ray diffraction, magnetometry, heat capacity, and neutron powder diffraction. NdSb 0.94 Te 0.92 is a collinear antiferromagnet with T N ∼ 2.7 K, where spins align antiparallel to each other, but parallel to the square net of the nuclear structure. NdSb 0.48 Te 1.37 exhibits a nearly five-fold modulated CDW (q CDW =0.18), isostructural to other LnSb x Te 2−x−δ at similarx. NdSb 0.48 Te 1.37 displays more complex magnetism with T N = 2.3 K, additional metamagnetic transitions, and an elliptical cycloid magnetic structure with q mag =-0.41b * . The magnitudes of q CDW and q mag exhibit a integer relationship, 1 + 2q mag = q CDW , implying a coupling between the CDW and magnetic structure. Given that the CDW is localized within the nonmagnetic distorted square net, we propose that conduction electrons "template" the spin modulation via the Ruderman-Kittel-Kasuya-Yosida interaction.

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“…This enables the observation of novel emergent quasi‐particles in crystalline systems that are not observed as fundamental particles. [ 10–12 ]…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher‐Fold Weyl Fermionic System PtAl

Saini,

Punjal,

Pandey

et al. 2023

Advanced Physics Research

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In topological materials, shielding of bulk and surface states by crystalline symmetries has provided hitherto unknown access to electronic states in condensed matter physics. Interestingly, photoexcited carriers relax on an ultrafast timescales, demonstrating large transient mobility that can be harnessed for the development of ultrafast optoelectronic devices. In addition, these devices are much more effective than topologically trivial systems because topological states are resilient to the corresponding symmetry‐invariant perturbations. By using optical pump probe measurements, the relaxation dynamics of a topologically nontrivial chiral single crystal, PtAl, is systematically described. Based on the experimental data on transient reflectivity and electronic structures, it is found that the carrier relaxation process involves both acoustic and optical phonons with oscillation frequencies of 0.06 and 2.94 THz, respectively, in picosecond time scale. PtAl with a space group of P213 allows only one non‐zero susceptibility element, i.e., d14, in second harmonic generation (SHG) with a large value of 468(1) pm V–1, which is significantly higher than that observed in standard GaAs(111) and ZnTe(110) crystals. The intensity dependence of the SHG signal in PtAl reveals a non‐perturbative origin. The present study on PtAl provides deeper insight into topological states that will be useful for ultrafast optoelectronic devices.

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Nonsymmorphic symmetry-protected band crossings in a square-net metal PtPb4

Cited by 19 publications

References 49 publications

Discovery of a Magnetic Dirac System with a Large Intrinsic Nonlinear Hall Effect

Discovery of a Magnetic Dirac System with a Large Intrinsic Nonlinear Hall Effect

Charge density wave-templated spin cycloid in topological semimetal $NdSb_{x}Te_{2-x-δ}$

Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher‐Fold Weyl Fermionic System PtAl

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