Observation of an Odd-Integer Quantum Hall Effect from Topological Surface States in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Cd</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>As</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Lin, Ben-Chuan; Wang, Shuo; Wiedmann, Steffen; Lü, Jianming; Zheng, Wen-Zhuang; Yu, Dapeng; Liao, Zhi-Min

doi:10.1103/physrevlett.122.036602

Cited by 61 publications

(42 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, a negative longitudinal magnetoresistance is expected [ Fig. 1(d in flakes with thicknesses no more than the mean free path, the so-called "Weyl orbit," are one more evidence of the location of the Fermi level [6,10,[30][31][32][33]. According to the Weyl point separation in WTe 2 , the Weyl orbits should vanish near ∼80 T, for a current along the a axis, but remain along the b axis [6].…”

Section: Resultsmentioning

confidence: 99%

Anisotropic planar Hall effect in the type-II topological Weyl semimetal WTe2

Zhang

Wen

et al. 2019

Phys. Rev. B

View full text Add to dashboard Cite

The giant planar Hall effect arising from a chiral anomaly, and that is related to the Berry curvature, has been predicted but never observed in nonmagnetic type-II Dirac/Weyl semimetals. Here, we report an observation of the anisotropic planar Hall effect in type-II Weyl semimetal WTe 2. Interestingly, we observe a chiral-anomaly-induced sinusoidal angular-dependent planar Hall effect when the electric field is parallel to the tilting direction of Weyl cone, i.e., the b axis of WTe 2. The planar Hall effect amplitude is linearly dependent on the magnetic fields and decreases gradually as the temperature increases across the topological phase transition temperature. Our observations clearly reveal the footprints on transport from the chiral anomaly feature in type-II Weyl semimetals.

show abstract

Section: Resultsmentioning

confidence: 99%

Anisotropic planar Hall effect in the type-II topological Weyl semimetal WTe2

Zhang

Wen

et al. 2019

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Among the various topological materials, the topological semimetal has sparked substantial interest due to its gapless Weyl/Dirac cones and unique surface Fermi arcs [3][4][5] . With nontrivial Fermi-arc surface states [5][6][7][8][9] , the Dirac semimetal Cd 3 As 2 has demonstrated exotic quantum transport properties of these surface states, such as π Aharonov-Bohm effect 9,10 , Fermi-arc-mediated Weyl orbital transport 11,12 , and quantum Hall effect from topologically protected Fermi arcs [13][14][15][16][17] . Besides the transport research in its normal phase, efforts have recently been made to couple the Fermi-arc surface states to a superconductor with the expectation of Majorana fermions [18][19][20][21] .…”

mentioning

confidence: 99%

Fermi-arc supercurrent oscillations in Dirac semimetal Josephson junctions

Wang

et al. 2020

Nat Commun

Self Cite

View full text Add to dashboard Cite

One prominent hallmark of topological semimetals is the existence of unusual topological surface states known as Fermi arcs. Nevertheless, the Fermi-arc superconductivity remains elusive. Here, we report the critical current oscillations from surface Fermi arcs in Nb-Dirac semimetal Cd 3 As 2-Nb Josephson junctions. The supercurrent from bulk states are suppressed under an in-plane magnetic field~0.1 T, while the supercurrent from the topological surface states survives up to 0.5 T. Contrary to the minimum normal-state conductance, the Fermi-arc carried supercurrent shows a maximum critical value near the Dirac point, which is consistent with the fact that the Fermi arcs have maximum density of state at the Dirac point. Moreover, the critical current exhibits periodic oscillations with a parallel magnetic field, which is well understood by considering the in-plane orbital effect from the surface states. Our results suggest the Dirac semimetal combined with superconductivity should be promising for topological quantum devices.

show abstract

“…As proposed based on a semiclassical picture, the bulk tunneling process may be experimentally detectable as phase shift of QH plateaus when the bulk thickness is modulated 4,5,12 . It should be noted, though, that a similar plateau shift can be induced also by inhomogeniety of sheet carrier density which varies proportionally to the thickness 13,14 . Therefore, it is challenging to verify the existence of Weyl orbits excluding extrinsic origins.…”

mentioning

confidence: 88%

“…Experimentally, transport signatures of the 2D surface states have been reported by several groups [9][10][11][12][13][14] , mainly for the typical DSM material Cd 3 As 2 . Distinct from the bulk transport under confinement 15,16 , the surface transport is characterized by a larger Fermi surface and band mass than their bulk counterparts [10][11][12][13][14] . It exhibits not only quantum oscillations but also quantum Hall (QH) effect in high magnetic fields or at low carrier concentrations [12][13][14] , attracting growing attention as novel quantized transport in a 3D system.…”

mentioning

confidence: 91%

“…Distinct from the bulk transport under confinement 15,16 , the surface transport is characterized by a larger Fermi surface and band mass than their bulk counterparts [10][11][12][13][14] . It exhibits not only quantum oscillations but also quantum Hall (QH) effect in high magnetic fields or at low carrier concentrations [12][13][14] , attracting growing attention as novel quantized transport in a 3D system. On the other hand, an important question still under debate is whether the two opposite surface states are coupled through the bulk nodes in the quantized state.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Intrinsic coupling between spatially-separated surface Fermi-arcs in Weyl orbit quantum Hall states

Nishihaya

Uchida

Nakazawa

et al. 2020

Preprint

View full text Add to dashboard Cite

Topological semimetals hosting bulk Weyl points and surface Fermi-arc states are expected to realize unconventional Weyl orbits, which interconnect two surface Fermi-arc states on opposite sample surfaces under magnetic fields. While the presence of Weyl orbits has been proposed to play a vital role in recent observation of quantum Hall effect even in three-dimensional topological semimetals, actual spatial distribution of the quantized surface transport has been experimentally elusive. Here, we demonstrate intrinsic coupling between two spatially-separated surface states in the Weyl orbits by measuring a dual-gate device of a Dirac semimetal film. Independent scans of top- and back-gate voltages reveal concomitant modulation of doubly-degenerate quantum Hall states, which is not possible in conventional surface orbits as in topological insulators. Our results evidencing the unique spatial distribution of Weyl orbits provide new opportunities for controlling the novel quantized transport by various means such as external fields and interface engineering.

show abstract

Observation of an Odd-Integer Quantum Hall Effect from Topological Surface States in Cd3As2

Cited by 61 publications

References 33 publications

Anisotropic planar Hall effect in the type-II topological Weyl semimetal WTe2

Anisotropic planar Hall effect in the type-II topological Weyl semimetal WTe2

Fermi-arc supercurrent oscillations in Dirac semimetal Josephson junctions

Intrinsic coupling between spatially-separated surface Fermi-arcs in Weyl orbit quantum Hall states

Contact Info

Product

Resources

About