Evolution of the Fermi surface of Weyl semimetals in the transition metal pnictide family

Liu, Z. K.; Yang, Lun; Sun, Yan; Zhang, T.; Han, Peng; Yang, Hao; Chen, C.; Zhang, Y.; Guo, Yanfeng; Prabhakaran, D.; Schmidt, Marcus; Hussain, Zahid; Felser, Claudia; Chen, Y. L.

doi:10.1038/nmat4457

Cited by 278 publications

(220 citation statements)

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“…These results are consistent with recent calculations [17,19,20]. Furthermore, recent angle resolved photoemission spectroscopy (ARPES) results [4,5,13,21] show the linear bulk band dispersion across the Weyl points, in agreement with the theoretical calculations. The electronic density of states plot shows a minimum value at the Fermi level.…”

Section: Electronic Structure Calculationssupporting

confidence: 91%

“…Angle resolved photoemission spectroscopy (ARPES) experiments revealed Fermi arcs on the surface and Weyl fermion cones and Weyl nodes in the bulk of the sample [5,7,8]. Furthermore, TaAs exhibits gigantic magnetoresitance of 5.4 × 10 4 % at 10 K upon application of a 9 T magnetic field, and a large mobility of 5 × 10 5 cm 2 ·V −1 ·s −1 [9].…”

Section: Introductionmentioning

confidence: 98%

“…A Weyl semimetal is analogous to a 3D version of graphene, since both share similar electronic band dispersion near the Fermi energy. A key property of a Weyl semimetal is that the surface states possesses "Fermi arcs" connecting the projection of bulk nodes in the surface Brillouin zone [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…We also report electronic structure calculations on these materials that demonstrate the critical role of spin-orbit coupling in determining their physical properties. Though a detailed crystal growth recipe has been mentioned in Reference [5], here we use a slightly different method which helps to improve the size of crystals. It is also a fact that a larger crystal plays an important role in physical measurements, and we have obtained relatively larger crystals than that reported elsewhere [5,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Single Crystal Growth, Resistivity, and Electronic Structure of the Weyl Semimetals NbP and TaP

2016

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Abstract:We have successfully synthesized niobium monophosphide and tantalum monophosphide crystals by a chemical vapor transport technique. We report resistivity vs. temperature of both materials in the temperature range from 2 K to 300 K. We have also performed electronic structure calculations and present the band structure and density of states of these two compounds. The calculations show that both compounds are semimetals, as their conduction and valence bands overlap near the Fermi energy.

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Section: Electronic Structure Calculationssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single Crystal Growth, Resistivity, and Electronic Structure of the Weyl Semimetals NbP and TaP

2016

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“…The investigation on novel topological quantum states, including topological insulators [1][2][3][4][5][6][7][8] , topological crystalline insulators [9][10][11][12][13][14] and topological semimetals [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] , has become one of the most intensively studied topics in condensed matter physics. These topological quantum states not only possess novel fermions (such as 2D and 3D Dirac fermions , Weyl Fermions [24][25][26][27][28][29][30][31][32] and Majorana Fermions [33][34] ) which can host many fascinating physical phenomena (such as the QSH effect [4][5] , QAH effect [35][36] , and XMR [37]…”

mentioning

confidence: 99%

Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb

et al. 2017

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, KHgX are insulating in the bulk but possess robust gapless surface states (see Fig. 1a), forming the unique "hourglass Fermions"on the (010) surface. The surface fermion contains four branches (quadruplets) dispersions and unbreakable zigzag chain-like patterns 49 (Fig. 1b). These surface states can also be understood as two copies of surface states of weak topological insulators 53 . The nonsymmorphic glide mirror protects these two copies from annihilating with each other inside the mirror plane. In order to visualize the intriguing hourglass fermion surface states and confirm the nonsymmorphic topological insulator nature of KHgX, ARPES is the natural experimental tool.In this work, we report comprehensive ARPES study on the electronic structures of KHgSb on both (001) and (010) Basic information of KHgSbHigh quality KHgSb crystals was synthesized by the flux method (see Appendix for details).The crystal structure of KHgSb is shown in Fig. 1c with space group P63/mmc and the lattice constants a=b=4.78 Å , c=10.225 Å . The in-plane Hg and Sb atoms show strong bonding, forming in-plane honeycomb lattices. The off-plane K atoms sit above the center of each honeycomb, sandwiched loosely by the two adjacent layers and serve as their inversion center.The natural cleavage surface is along the (001) and (010) surface (parallel to the diagonal of the in-plane honeycomb and preserves the glide reflection). The bulk Brillouin zone (BZ) and the surface BZs of both (001) and (010) surfaces are shown in Fig. 1d. Fig. 1e, f illustrate the broad Fermi surface mapping across multiple BZs on the (001) and (010) surfaces, respectively, confirming the cleavage surfaces with correct lattice parameters (the momentum direction of kx is defined along Γ − X; ky along Γ ̅ − K ̅ and kz along Γ − Z, respectively, see Fig. 1d). The core level photoemission spectra (Fig. 1g) show sharp characteristic Sb4d, K3p and Hg5d levels. The electronic structures on the (001) surfaceWe first focus on the electronic structures on the (001) According to the band structure calculation 49, KHgSb is a fully gapped nonsymmorphic crystalline topological insulator with no surface states residing on the (001) surfaces. In order to prove this, we tuned the Fermi surface by introducing potassium atoms in situ onto the sample surface so that the absorbed potassium atoms on the surface would donate free electrons.After K-dosing, we could clearly observe the bottom of the conduction band and the top of the valence band simultaneously along both (Fig. 2g(i)-(ii)). An indirect band gap of ~200 meV is observed with no signatures of in-gap surface states (Fig. 2h), agreeing with the calculations (Fig. 2e). The electronic structures on the (010) surfaceNext we demonstrate the detailed electronic structure on the (010) surface in Figure 3. Fig. 3a shows the stacking CECs. After inspecting CECs ranging from Eb=0~400meV, one could observe (see Fig. 3a,b) the quasi-one-dimensional Fermi surface disperses into two pieces when going to higher binding energies until ...

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Weyl Semimetal States Generated Extraordinary Quasi‐Linear Magnetoresistance and Nernst Thermoelectric Power Factor in Polycrystalline NbP

Liu

Wang

et al. 2022

Adv Funct Materials

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Unsaturated and extremely large magnetoresistance (MR), as well as the giant Nernst effect, are intriguing transport phenomena in Weyl semimetals, which are technically appealing for potential applications in magneto-electric sensors and transverse thermoelectric conversion. The prominent properties are originated from Weyl semimetal states, i.e., the coexistence of electron and hole pockets combined with linear band dispersion. However, previous studies have been focused on small-sized single crystals, rendering the practical applications of Weyl semimetals. Here, it is reported an unsaturated, quasi-linear MR as well as a very large Nernst power factor PF xy in the prepared centimeter-sized and polycrystalline Weyl semimetal NbP. An extraordinary MR of ≈2 × 10 4 % is observed below 60 K with a magnetic field up to 55 T and persists to elevated temperatures. The unusual quasi-linear MR behavior is explained by the theory of classical linear MR arising from structural disorder. The polycrystalline NbP exhibits state-of-the-art PF xy that reaches a maximum value of 74.81 μW cm -1 K -2 at 9 T and 220 K, which is 1.5 times larger than its longitudinal thermoelectric power factor PF xx . Given that polycrystalline Weyl semimetal, NbP is suitable for large-scale production, the results pave the way for its practical applications in magneto-electric sensors and transverse thermoelectric conversion.

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Evolution of the Fermi surface of Weyl semimetals in the transition metal pnictide family

Cited by 278 publications

References 28 publications

Single Crystal Growth, Resistivity, and Electronic Structure of the Weyl Semimetals NbP and TaP

Single Crystal Growth, Resistivity, and Electronic Structure of the Weyl Semimetals NbP and TaP

Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb

Weyl Semimetal States Generated Extraordinary Quasi‐Linear Magnetoresistance and Nernst Thermoelectric Power Factor in Polycrystalline NbP

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