Weyl semimetals as catalysts

Rajamathi, Catherine R.; Gupta, Uma; Kumar, Nitesh; Hao, Yang; Sun, Yan; Süβ, Vicky; Shekhar, Chandra; Schmidt, Marcus; Yan, Binghai; Parkin, Stuart S. P.; Felser, Claudia; R., Rao, C. N.

doi:10.48550/arxiv.1608.03783

Cited by 4 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Remarkably, among all known data TiSi exhibits a ∆G H * most close to zero. In particular, in comparison with these TWs [48] in Fig. 5e, TiSi possibly shows a more excellent HER performance, because their ∆G H * values of TiSi are almost at the top of the Volcano curve.…”

Section: (B) and 3(c)mentioning

confidence: 90%

“…Most recently, TWs (NbP, TaP, NbAs and TaAs) have been considered to serve as excellent candidates of catalysts because of the remarkable performance of the hydrogen evolution reaction (HER) [48]. This key concept of TWs as catalysts is extremely nice by alternatively providing a way to create the active sites with topological surface states, rather than by traditionally increasing the active edge sites or vacancies [49][50][51][52][53][54][55].…”

mentioning

confidence: 99%

“…1a), because that the strength of electrostatic screening in TWs is much weaker than the normal metal (e.g., Pt). However, a DNL material shows two distinguishing features from both TDs and TWs [48]. In its bulk phase, a DNL results in a certain carrier density around the Fermi level (Fig.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Topological quantum catalyst: Dirac nodal line states and a potential electrocatalyst of hydrogen evolution in the TiSi family

Xie

et al. 2017

Sci. China Mater.

113

View full text Add to dashboard Cite

Topological nodal line (DNL) semimetals, a closed loop of the inverted bands in its bulk phases, result in the almost flat drumhead-like non-trivial surface states (DNSSs) with an unusually high electronic density near the Fermi level. High catalytic active sites generally associated with high electronic densities around the Fermi level, high carrier mobility and a close-to-zero free energy of the adsorbed state of hydrogen (∆G H* ≈0) are prerequisite to design alternative of precious platinum for catalyzing electrochemical hydrogen production from water. By combining these two aspects, it is natural to consider if the DNLs are a good candidate for the hydrogen evolution reaction (HER) or not because its DNSSs provide a robust platform to activate chemical reactions. Here, through first-principles calculations we reported a new DNL TiSi-type family, exhibiting a closed Dirac nodal line due to the linear band crossings in k y =0 plane. The hydrogen adsorbed state on the surface yields ∆G H* to be almost zero and the topological charge carries participate in HER. The results highlight a new routine to design topological quantum catalyst utilizing the topological DNL-induced surface bands as active sites, rather than edge sites-, vacancy-, dopant-, strain-, or heterostructure-created active sites. Topologically protected surface states in gold-covered Bi 2 Se 3 topological insulators were theoretically suggested to serve as an effective electron path in the case of the CO oxidation [49]. Most recently, TWs (NbP, TaP, NbAs and TaAs) have been considered as excellent candidates of catalysts for hydrogen evolution reaction (HER) [50]. This key concept of TWs as catalysts was pioneered by topological surface states which provide an alternative way to create active sites, rather than by traditionally increasing the active edge sites or vacancies [51][52][53][54][55][56][57][58][59][60]. The possible bottleneck of TWs as electrocatalyst is their lower carrier density around Fermi level (Fig. 1a), because electrostatic screening strength in TWs is much weaker than that in the normal metals (e.g., Pt). DNL semimetal

show abstract

Section: (B) and 3(c)mentioning

confidence: 90%

mentioning

confidence: 99%

See 1 more Smart Citation

Topological quantum catalyst: Dirac nodal line states and a potential electrocatalyst of hydrogen evolution in the TiSi family

Xie

et al. 2017

Sci. China Mater.

113

View full text Add to dashboard Cite

show abstract

“…This makes our central question important for the development of potential technological applications of the surface states, e.g. as a "catalyst" in solar cells [46]. Do the Weyl Fermi-arcs (or any remnant of them) survive disorder?…”

mentioning

confidence: 99%

Do the surface Fermi arcs in Weyl semimetals survive disorder?

et al. 2018

View full text Add to dashboard Cite

We theoretically study the topological robustness of the surface physics induced by Weyl Fermi-arc surface states in the presence of short-ranged quenched disorder and surface-bulk hybridization. This is investigated with numerically exact calculations on a lattice model exhibiting Weyl Fermi-arcs. We find that the Fermi-arc surface states, in addition to having a finite lifetime from disorder broadening, hybridize with nonperturbative bulk rare states making them no longer bound to the surface (i.e. they lose their purely surface spectral character). Thus, we provide strong numerical evidence that the Weyl Fermi-arcs are not topologically protected from disorder.Nonetheless, the surface chiral velocity is robust and survives in the presence of strong disorder, persisting all the way to the Anderson-localized phase by forming localized current loops that live within the localization length of the surface. Thus, the Weyl semimetal is not topologically robust to the presence of disorder, but the surface chiral velocity is. arXiv:1801.05438v2 [cond-mat.str-el]

show abstract

“…Recent efforts to study phases defined by topologicallyprotected band structure degeneracies [1][2][3][4][5][6][7][8][9][10][11][12][13][14] reflect their great potential for technological applications 15, 16 and for table-top experiments on quasiparticles both analogous to high-energy particles and beyond this framework [17][18][19][20][21][22][23][24][25] . There is also a major undertaking to study these systems in the presence of correlations that suggests far richer physics beyond the weakly-correlated regime [26][27][28][29][30][31][32][33][34][35][36][37][38] .…”

Section: Introductionmentioning

confidence: 99%

Magnetic Weyl and Dirac Kondo semimetal phases in heterostructures

Ok,

Legner,

Neupert

et al. 2017

Preprint

View full text Add to dashboard Cite

We study a layered three-dimensional heterostructure in which two types of Kondo insulators are stacked alternatingly. One of them is the topological Kondo insulator SmB6, the other one an isostructural Kondo insulator AB6, where A is a rare-earth element, e.g., Eu, Yb, or Ce. We find that if the latter orders ferromagnetically, the heterostructure generically becomes a magnetic Weyl Kondo semimetal, while antiferromagnetic order can yield a magnetic Dirac Kondo semimetal. We detail both scenarios with general symmetry considerations as well as concrete tight-binding calculations and show that type-I as well as type-II magnetic Weyl/Dirac Kondo semimetal phases are possible in these heterostructures. Our results demonstrate that Kondo insulator heterostructures are a versatile platform for design of strongly correlated topological semimetals.

show abstract

Weyl semimetals as catalysts

Cited by 4 publications

References 0 publications

Topological quantum catalyst: Dirac nodal line states and a potential electrocatalyst of hydrogen evolution in the TiSi family

Topological quantum catalyst: Dirac nodal line states and a potential electrocatalyst of hydrogen evolution in the TiSi family

Do the surface Fermi arcs in Weyl semimetals survive disorder?

Magnetic Weyl and Dirac Kondo semimetal phases in heterostructures

Contact Info

Product

Resources

About