Compensated Semimetal LaSb with Unsaturated Magnetoresistance

Zeng, Longfei; Lou, Rui; Wu, Desheng; Xu, Qiunan; Guo, Peng‐Jie; Kong, Ling-Yuan; Zhong, Yangwan; Ma, Junzhang; Bao, Futing; Richard, P.; Wang, P.; Liu, G. T.; Lü, Li; Huang, Yaobo; Fang, Chi; Sun, Shanshan; Wang, Q.; Wang, L.; Shi, Youguo; Weng, H. M.; Lei, Hechang; Liu, K.; Wang, S. C.; Qian, Tian; Luo, Jianlin; Ding, H.

doi:10.1103/physrevlett.117.127204

Cited by 138 publications

(92 citation statements)

References 54 publications

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“…Moreover, a very large, unusual magnetoresistance has been observed in LaSb20, LaBi21 and a similar compound YSb22, thus stimulating interest in directly observing any TSSs. By contrast, angle-resolved photoelectron spectroscopy (ARPES) on LaSb has revealed that this compound has a topologically trivial band dispersion23.…”

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confidence: 95%

Multiple Dirac cones at the surface of the topological metal LaBi

et al. 2017

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The rare-earth monopnictide LaBi exhibits exotic magneto-transport properties, including an extremely large and anisotropic magnetoresistance. Experimental evidence for topological surface states is still missing although band inversions have been postulated to induce a topological phase in LaBi. In this work, we have revealed the existence of surface states of LaBi through the observation of three Dirac cones: two coexist at the corners and one appears at the centre of the Brillouin zone, by employing angle-resolved photoemission spectroscopy in conjunction with ab initio calculations. The odd number of surface Dirac cones is a direct consequence of the odd number of band inversions in the bulk band structure, thereby proving that LaBi is a topological, compensated semimetal, which is equivalent to a time-reversal invariant topological insulator. Our findings provide insight into the topological surface states of LaBi's semi-metallicity and related magneto-transport properties.

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confidence: 95%

Multiple Dirac cones at the surface of the topological metal LaBi

et al. 2017

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“…[1][2][3][4][5][6] Here magnetoresistance is defined by the ratio R(H)/R(0), where R is the electrical resistance and H is the applied magnetic field. In transition metal oxides, both Giant and Colossal Magnetoresistance have been observed 7,8 and implemented in non-volatile magnetic memory, 9 as magnetic sensors, 10 as well as proposed spin valves in spintronics.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the atomic orbital composition of the near-fermi-level electronic states in the lanthanum monopnictides LaBi, LaSb, and LaAs

et al. 2018

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Recent debates in the literature over the relationship between topology and Extreme Magnetoresistance (XMR) have drawn attention to the Lanthanum Monopnictide family of binary compounds. Angle resolved photoemission spectroscopy (ARPES) is used to measure the electronic structure of the XMR topological semimetal candidates LaBi, LaSb, and LaAs. The orbital content of the near-E F states in LaBi and LaSb are extracted using varying photon polarizations and both dominant d and p bands are observed near X. The measured bulk bands are shifted in energy when compared to the results of Density Functional Calculations. This disagreement is minor in LaBi, but large in LaSb and LaAs. The measured bulk band structure of LaBi shows a clear band inversion and puts LaBi in the υ = 1 class of Topological Insulators (or semimetals), as predicted by calculations and consistent with the measured Dirac-like surface states. LaSb is on the verge of a band inversion with a less-clear case for any distinctly topological surface states and in disagreement with calculations. Lastly, these same bands in LaAs are clearly non-inverted implying its topological triviality and demonstrating a topological phase transition in the Lanthanum monopnictides. Using a wide range of photon energies the true bulk states are cleanly disentangled from the various types of surface states which are present. These surface states exist due to surface projections of bulk states in LaSb and for topological reasons in LaBi.

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“…The MR is characterized by a near-quadratic field dependence and a field-induced up-turn in the resistivity, followed by a plateau at low temperature. 29 Soon after, these characters were also observed in several semimetals. [30][31][32][33][34] Different mechanisms have been proposed to explain the exotic quadratic XMR behaviors.…”

Section: Resultsmentioning

confidence: 81%

“…38 Nevertheless, a non-saturated XMR was found in compensated semimetal LaSb. 29 The suppression of MR without observable change of the Fermi surfaces with increasing temperature was observed. 29 This is contradictory to the above results.…”

Section: Resultsmentioning

confidence: 92%

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Spin splitting and electric field modulated electron-hole pockets in antimonene nanoribbons

Song

Wang

2017

npj Quant Mater

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The one-dimensional nanoribbons have great potential applications in novel multifunctional electronic devices. Herewith, we investigate the electronic structure of antimonene nanoribbons using the first-principles calculations. Four ribbon models are considered. All of them are semiconductors with appropriate band gaps. Because of the loss of inversion symmetry, spin-orbit splitting appears in the asymmetric washboard nanoribbons. Significantly, spin splittings of 62 and 44 meV are found at the valence band maximum and conduction band minimum for zigzag asymmetric washboard nanoribbon (aW-zSbNR). Further applying an inplane electric field introduces a potential difference between the two zigzag edges. The energies for the localized edge states are modified. Eventually spin-orbit-coupling induced band inversion and electron-hole pockets with appropriately the same size could be triggered in a W-zSbNR, which is interesting for exploiting the magnetoresistance effect.npj Quantum Materials (2017) 2:15 ;

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Compensated Semimetal LaSb with Unsaturated Magnetoresistance

Cited by 138 publications

References 54 publications

Multiple Dirac cones at the surface of the topological metal LaBi

Multiple Dirac cones at the surface of the topological metal LaBi

Measurement of the atomic orbital composition of the near-fermi-level electronic states in the lanthanum monopnictides LaBi, LaSb, and LaAs

Spin splitting and electric field modulated electron-hole pockets in antimonene nanoribbons

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