Electronic structures of transition metal dipnictides<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>X</mml:mi><mml:mi>P</mml:mi><mml:msub><mml:mi>n</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>X</mml:mi><mml:mo>=</mml:mo><mml:mi>Ta</mml:mi></mml:mrow></mml:math>, Nb;<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>P</mml:mi><mml:mi>n</mml:mi><mml:mo>=</mml:mo><mml:

Xu, Chenchao; Chen, Jia; Zhi, Guoxiang; Li, Yuke; Dai, Jianhui; Cao, Chao

doi:10.1103/physrevb.93.195106

Cited by 62 publications

(60 citation statements)

References 25 publications

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“…However, the theoretical predictions for the topological properties vary in the LnX series 30 . In addition, similar fingerprints have also been reported in several semimetals including TmPn 2 (Tm = Ta/Nb, Pn = As/Sb) [31][32][33][34][35][36] 43 , and NbP 44 . The topological origin of the large magnetoresistance and resistivity plateau is still under debate.…”

supporting

confidence: 72%

Evidence of topological insulator state in the semimetal LaBi

Lou

Bao

et al. 2017

Phys. Rev. B

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By employing angle-resolved photoemission spectroscopy combined with first-principles calculations, we performed a systematic investigation on the electronic structure of LaBi, which exhibits extremely large magnetoresistance (XMR), and is theoretically predicted to possess band anticrossing with nontrivial topological properties. Here, the observations of the Fermi-surface topology and band dispersions are similar to previous studies on LaSb [Phys. Rev. Lett. 117, 127204 (2016)], a topologically trivial XMR semimetal, except the existence of a band inversion along the Γ-X direction, with one massless and one gapped Dirac-like surface state at the X and Γ points, respectively. The odd number of massless Dirac cones suggests that LaBi is analogous to the time-reversal Z 2 nontrivial topological insulator. These findings open up a new series for exploring novel topological states and investigating their evolution from the perspective of topological phase transition within the family of rare-earth monopnictides.PACS numbers: 73.20. At, 71.18.+y, 71.20.Eh Exploring exotic topological states has sparked extensive research interest, both theoretically and experimentally, due to their promising potential in low consumption spintronics devices 1-3 . In the past decade, since the discovery of quantum spin Hall effect in graphene 4 , remarkable achievements have been reached, including the findings of twodimensional (2D) 5-7 and three-dimensional (3D) topological insulators (TIs) 8 , node-line semimetals 9,10 , topological crystalline insulators 11,12 , and Dirac and Weyl semimetals [13][14][15][16][17][18] . Strikingly, although the TIs have ignited the whole field for years, the realization of novel massless surface Dirac fermions, i.e., topological surface states (SSs), is still pretty exciting due to the great prospects in tunability of the topological characteristics through easily accessible manipulations 19 . Among the extensive efforts, the study on the topological phase transition (TPT) can also effectively facilitate the exploration and investigation of topological SSs and even the Dirac semimetals [20][21][22] .Recently, the discovery of simple rock salt rare-earth monopnictides LnX (Ln = La, Y, Nd, or Ce; X = Sb/Bi) [23][24][25][26][27][28][29] has renewed the platform for searching these novel topological states. The most remarkable signature of this series is the extremely large magnetoresistance (XMR) with a resistivity plateau at low temperatures, which is proposed as the consequence of breaking time-reversal symmetry 23 . However, the theoretical predictions for the topological properties vary in the LnX series 30 . In addition, similar fingerprints have also been reported in several semimetals including TmPn 2 (Tm = Ta/Nb, Pn = As/Sb) 31-36 , ZrSiS 37-39 , WTe 2 40 , Cd 3 As 2 41,42 , TaAs 43 , and NbP 44 . The topological origin of the large magnetoresistance and resistivity plateau is still under debate. Furthermore, the rich and interesting topological phases predicted in the LnX family offer an ...

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supporting

confidence: 72%

Evidence of topological insulator state in the semimetal LaBi

Lou

Bao

et al. 2017

Phys. Rev. B

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“…The discovery of such symmetry protected states of matter in two-dimensional (2D) [4-6] and three-dimensional (3D) topological insulators [7], node-line semimetals [8,9], topological crystalline insulators [10,11], and Dirac and Weyl semimetals [12][13][14][15][16][17], has attracted tremendous interests in condensed matter physics and material science. The magnetotransport behavior of these states is often unusual, such as linear transverse magnetoresistance (MR) and negative longitudinal MR in Dirac and Weyl semimetals [18][19][20][21][22][23][24], and more generally, extremely large transverse MR (XMR) in nonmagnetic semimetals [25][26][27][28][29][30].Recently, the discovery of XMR in a class of transition metal dipnictides T mPn 2 (T m = Ta, Nb; Pn = P, As, Sb) [31][32][33][34][35][36] has sparked immense interests for understanding the underlying mechanism of quadratic XMR and exploring novel quantum states arising from nontrivial topology. Another two series of semimetals possessing quadratic XMR behavior and rich topological characteristics are the ZrSiS family [37][38][39] and LnX (Ln = La, Y, Nd, or Ce; X = Sb/Bi) series [40][41][42][43][44][45][46], whose electronic structures ha...…”

mentioning

confidence: 99%

“…Another two series of semimetals possessing quadratic XMR behavior and rich topological characteristics are the ZrSiS family [37][38][39] and LnX (Ln = La, Y, Nd, or Ce; X = Sb/Bi) series [40][41][42][43][44][45][46], whose electronic structures have been considerably studied both in theory and experiment [47][48][49][50][51][52][53]. While the band structures of the T mPn 2 series have been theoretically characterized in several work [32][33][34]54], experimental observations have not yet been reported. It is widely believed that the large positive MR in semimetals is intimately related to their underlying electronic structures.…”

mentioning

confidence: 99%

“…Recently, the discovery of XMR in a class of transition metal dipnictides T mPn 2 (T m = Ta, Nb; Pn = P, As, Sb) [31][32][33][34][35][36] has sparked immense interests for understanding the underlying mechanism of quadratic XMR and exploring novel quantum states arising from nontrivial topology. Another two series of semimetals possessing quadratic XMR behavior and rich topological characteristics are the ZrSiS family [37][38][39] and LnX (Ln = La, Y, Nd, or Ce; X = Sb/Bi) series [40][41][42][43][44][45][46], whose electronic structures have been considerably studied both in theory and experiment [47][48][49][50][51][52][53].…”

mentioning

confidence: 99%

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Observation of open-orbit Fermi surface topology in the extremely large magnetoresistance semimetalMoAs2

Lou

Zhao

et al. 2017

Phys. Rev. B

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While recent advances in band theory and sample growth have expanded the series of extremely large magnetoresistance (XMR) semimetals in transition metal dipnictides T mPn 2 (T m = Ta, Nb; Pn = P, As, Sb), the experimental study on their electronic structure and the origin of XMR is still absent. Here, using angle-resolved photoemission spectroscopy combined with first-principles calculations and magnetotransport measurements, we performed a comprehensive investigation on MoAs 2 , which is isostructural to the T mPn 2 family and also exhibits quadratic XMR. We resolve a clear band structure well agreeing with the predictions. Intriguingly, the unambiguously observed Fermi surfaces (FSs) The emergence of novel states in condensed matter is not only classified by the typical spontaneous symmetry breaking, but also by their topology, i.e., the topologically protected quantum states [1][2][3]. The discovery of such symmetry protected states of matter in two-dimensional (2D) [4-6] and three-dimensional (3D) topological insulators [7], node-line semimetals [8,9], topological crystalline insulators [10,11], and Dirac and Weyl semimetals [12][13][14][15][16][17], has attracted tremendous interests in condensed matter physics and material science. The magnetotransport behavior of these states is often unusual, such as linear transverse magnetoresistance (MR) and negative longitudinal MR in Dirac and Weyl semimetals [18][19][20][21][22][23][24], and more generally, extremely large transverse MR (XMR) in nonmagnetic semimetals [25][26][27][28][29][30].Recently, the discovery of XMR in a class of transition metal dipnictides T mPn 2 (T m = Ta, Nb; Pn = P, As, Sb) [31][32][33][34][35][36] has sparked immense interests for understanding the underlying mechanism of quadratic XMR and exploring novel quantum states arising from nontrivial topology. Another two series of semimetals possessing quadratic XMR behavior and rich topological characteristics are the ZrSiS family [37][38][39] and LnX (Ln = La, Y, Nd, or Ce; X = Sb/Bi) series [40][41][42][43][44][45][46], whose electronic structures have been considerably studied both in theory and experiment [47][48][49][50][51][52][53]. While the band structures of the T mPn 2 series have been theoretically characterized in several work [32][33][34]54], experimental observations have not yet been reported. It is widely believed that the large positive MR in semimetals is intimately related to their underlying electronic structures. Therefore, a systematic and unambiguous experimental study on the electronic structure of the T mPn 2 family is urgently demanded. Eventually, we suggest the open-orbit Fermi surface (FS) topology as another candidate mechanism to explain the XMR, in addition to the earlier proposed origins like nontrivial band topology [40], forbidden backscattering at zero field [55], and electron-hole compensation [56].In this Letter, we employ systematic angle-resolved photoemission spectroscopy (ARPES), first-principles calculations, and magnetotransport measurements o...

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“…In contrast, all the nodal lines in Nb(Ta)Pn 2 become fully gapped in the presence of SOC, which leads to completely separated electron and hole bands [56]. The calculation also shows that Nb(Ta)As 2 and NbSb 2 are close to the compensated semimetals with equal electron and hole densities.…”

Section: Bulk and Surface Electron Statesmentioning

confidence: 84%

Crystal growth and electrical transport properties of niobium and tantalum monopnictide and dipnictide semimetals

Jia

2017

Front. Phys.

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The discovery of the first Weyl semimetal tantalum monoarsenide has greatly promoted physical research on the niobium and tantalum pnictide compounds. Crystallizing into the NbAs-and OsGe 2 -type structures, these mono-and di-pnictide semimetals manifest exotic electrical transport properties in magnetic field, which only occur in their single-crystalline forms. All the unusual electrical properties correspond to their poor carriers, which are indeed vulnerable to various crystal defects. In this review article, we present a comprehensive comparison of the crystal growth and electrical transport properties of the two semimetal families. We then discuss in detail the possible characteristic transport features, such as the chiral anomaly of Weyl quasiparticles. We emphasize the importance of crystal growth and sample manipulation for exploring the unique topological properties of Weyl semimetals in the future.

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Electronic structures of transition metal dipnictidesXPn2(X=Ta, Nb;Pn=

Cited by 62 publications

References 25 publications

Evidence of topological insulator state in the semimetal LaBi

Evidence of topological insulator state in the semimetal LaBi

Observation of open-orbit Fermi surface topology in the extremely large magnetoresistance semimetalMoAs2

Crystal growth and electrical transport properties of niobium and tantalum monopnictide and dipnictide semimetals

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