Observation of Fermi-Arc Spin Texture in TaAs

Lv, Baoliang; Muff, Stefanie; Qian, Tian; Song, Zhida; Nie, Simin; Xu, N.; Richard, P.; Matt, C. E.; Plumb, N. C.; Zhao, Lingxiao; Chen, Genfu; Fang, Zhong; Dai, Xi; Dil, J. Hugo; Mesot, J.; Shi, M.; Weng, Hongming; Ding, Hong

doi:10.1103/physrevlett.115.217601

Cited by 126 publications

(94 citation statements)

References 30 publications

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“…The 1/2 term comes from the Berry phase π [16,19,[32][33][34]. When the AB phase term (namely ) equals half integer, a gapless mode can be realized.…”

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confidence: 99%

“…Lots of angle-resolved photoemission spectroscopy (ARPES) experiments [7,[15][16][17][18] [16,19,[32][33][34][35][36][37][38]. Although the one-dimensional helical transport has been demonstrated in topological insulator nanowires through measuring the AB oscillations is the flux quantum and , where is the measured magnetic field periodicity ( in this case) and S is the cross-sectional area.…”

mentioning

confidence: 99%

“…Lots of angle-resolved photoemission spectroscopy (ARPES) experiments [7,[15][16][17][18] have confirmed the existence of Fermi arc, which connects different Weyl nodes in the projected 2D Brillouin zone. Moreover, the Fermi arcs have been demonstrated to be spin polarized [16,19] with a spin-polarization magnitude as large as 80% [19]. However, it is still hard to detect the properties of the topological surface states in transport experiments [20], mainly because the unavoidable conducting bulk states.…”

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confidence: 99%

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Gate-tuned Aharonov-Bohm interference of surface states in a quasiballistic Dirac semimetal nanowire

Lin

Wang

et al. 2017

Phys. Rev. B

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Dirac semimetals [1], such as Cd 3 As 2 or Na 3 Bi [2][3][4][5][6][7][8][9][10], show a linear electronic dispersion in three dimensions described by two copies of the Weyl equation. Applying a magnetic field can break the time reversal symmetry, and the Dirac semimetal is transformed into a Weyl semimetal with the two Weyl nodes separated in the momentum space [10,11]. Chiral charge pumping between the Weyl nodes with different chirality is predicted, which brings the Weyl fermions into the experimental realm. Recently, anomalous transport properties signaled by a pronounced negative magnetoresistance are observed as the evidence for the chiral anomaly effect [10,12].Besides this, the surface dispersion-relation of a Weyl semimetal is topologically equivalent to a non-compact Riemann surface without equal-energy contour that encloses the projection of the Weyl point [13], leading to the emergence of surface Fermi arcs [14]. Lots of angle-resolved photoemission spectroscopy (ARPES) experiments [7,[15][16][17][18] [16,19,[32][33][34][35][36][37][38]. Although the one-dimensional helical transport has been demonstrated in topological insulator nanowires through measuring the AB oscillations is the flux quantum and , where is the measured magnetic field periodicity ( in this case) and S is the cross-sectional area.From the magnetic field periodicity, we can deduce the cross-sectional area to be , which is consistent with the nanowire diameter ~58 nm. In To further clearly present the conductance oscillations, we plot the mapping of ∆G versus gate voltage and magnetic field in Fig. 1d. Clearly there are two kinds of phase modulations on the interference. One is tuned by gate voltage, and the other is influenced by the magnetic field. At a fixed gate voltage, if the conductance reaches the minimum at zero magnetic field, the conductance will be the maximum at half integer multiple of ; if the conductance is maximum at zero magnetic field, the conductance will be the maximum at integer multiple of . The phase of the AB interference is strongly dependent on gate voltage. while when the chirality is -1, the energy dispersion has a similar form with a sign 6 change. This physics picture is depicted in Fig. 2. At zero magnetic field, that is =0, the original linear energy dispersion becomes gapped with a series of sub-bands, as shown in Fig. 2a. The red and blue lines represent the chirality to be +1 and -1, respectively. According to the surface band splitting, there should emerge a periodic oscillation when the Fermi level crosses the sub-bands continuously. This is what happens in our Cd 3 As 2 nanowires, as shown in Fig. 1b.When a magnetic field is applied, the corresponding AB oscillation term should be considered. The surface energy band diagrams at the magnetic flux and are depicted in Fig. 2b, where the letter L and R denote the chirality of Weyl nodes to be +1 or −1. Apparently, when the magnetic flux is half integer of Ф 0 , the linear energy band with specified chirality emerges. The quantum transport can be...

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“…The 1/2 term comes from the Berry phase π [16,19,[32][33][34]. When the AB phase term (namely ) equals half integer, a gapless mode can be realized.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Gate-tuned Aharonov-Bohm interference of surface states in a quasiballistic Dirac semimetal nanowire

Lin

Wang

et al. 2017

Phys. Rev. B

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“…Weyl semimetals have been first experimentally discovered in the TaAs monopnictide family, known as type-I [3,4,[10][11][12][13][14]. More recently, it has been suggested that once Lorentz invariance is broken, a new flavor of Weyl material can be realized, the so-called type-II, where strongly tilted Weyl cones emerge at the boundaries between bulk electron and hole pockets [15].…”

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confidence: 99%

Universal scattering response across the type-II Weyl semimetal phase diagram

et al. 2018

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“…Angle resolved photoemission spectroscopy measurements together with ab initio calculations demonstrated that fermions in TaAs can be described as massless chiral particles with spin 1 /2 [2][3][4][5][6]. Recently, Wu et al [7] have measured a very intense nonlinear optical response of TaAs together with other monopnictide Weyl semimetals, while Weber et al [8] have studied the ultrafast dynamics of TaAs.…”

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confidence: 99%

Tantalum Arsenide-Based One-Dimensional Photonic Structures

2018

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Weyl semimetals can be described as the three-dimensional analogue of graphene, showing linear dispersion around nodes (Weyl points). Tantalum arsenide is among the most studied Weyl semimetals. It has been demonstrated that TaAs has a very high value of the real part of the complex refractive index in the infrared region. In this work we show one-dimensional photonic crystals alternating TaAs with SiO 2 or TiO 2 and a microcavity where a layer of TaAs is embedded between two SiO 2 -TiO 2 multilayers.

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Observation of Fermi-Arc Spin Texture in TaAs

Cited by 126 publications

References 30 publications

Gate-tuned Aharonov-Bohm interference of surface states in a quasiballistic Dirac semimetal nanowire

Gate-tuned Aharonov-Bohm interference of surface states in a quasiballistic Dirac semimetal nanowire

Universal scattering response across the type-II Weyl semimetal phase diagram

Tantalum Arsenide-Based One-Dimensional Photonic Structures

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