Observation and control of maximal Chern numbers in a chiral topological semimetal

Niels B.M. Schröter; Samuel Stolz; Kaustuv Manna; Fernando De Juan; Maia G. Vergniory; Jonas A. Krieger; Ding Pei; Thorsten Schmitt; Pavel Dudin; Timur K. Kim; Cephise Cacho; Barry Bradlyn; Horst Borrmann; Marcus Schmidt; Roland Widmer; Vladimir N. Strocov; Claudia Felser

doi:10.1126/science.aaz3480

Observation and control of maximal Chern numbers in a chiral topological semimetal

Niels B.M. Schröter, Samuel Stolz, Kaustuv Manna, Fernando De Juan, Maia G. Vergniory, Jonas A. Krieger, Ding Pei, Thorsten Schmitt, Pavel Dudin, Timur K. Kim, Cephise Cacho, Barry Bradlyn, Horst Borrmann, Marcus Schmidt, Roland Widmer, Vladimir N. Strocov, Claudia Felser

Physics

Research output: Contribution to journal › Article

Abstract

Topological semimetals feature protected nodal band degeneracies characterized by a topological invariant known as the Chern number (C). Nodal band crossings with linear dispersion are expected to have at most |C| = 4, which sets an upper limit to the magnitude of many topological phenomena in these materials. Here, we show that the chiral crystal palladium gallium (PdGa) displays multifold band crossings, which are connected by exactly four surface Fermi arcs, thus proving that they carry the maximal Chern number magnitude of 4. By comparing two enantiomers, we observe a reversal of their Fermi-arc velocities, which demonstrates that the handedness of chiral crystals can be used to control the sign of their Chern numbers.

Original language	English (US)
Pages (from-to)	179-183
Number of pages	5
Journal	Science
Volume	369
Issue number	6500
DOIs	https://doi.org/10.1126/science.aaz3480
State	Published - Jul 10 2020

ASJC Scopus subject areas

General

Access to Document

10.1126/science.aaz3480

Fingerprint Dive into the research topics of 'Observation and control of maximal Chern numbers in a chiral topological semimetal'. Together they form a unique fingerprint.

Cite this

Schröter, N. B. M., Stolz, S., Manna, K., De Juan, F., Vergniory, M. G., Krieger, J. A., Pei, D., Schmitt, T., Dudin, P., Kim, T. K., Cacho, C., Bradlyn, B., Borrmann, H., Schmidt, M., Widmer, R., Strocov, V. N., & Felser, C. (2020). Observation and control of maximal Chern numbers in a chiral topological semimetal. Science, 369(6500), 179-183. https://doi.org/10.1126/science.aaz3480

Observation and control of maximal Chern numbers in a chiral topological semimetal. / Schröter, Niels B.M.; Stolz, Samuel; Manna, Kaustuv; De Juan, Fernando; Vergniory, Maia G.; Krieger, Jonas A.; Pei, Ding; Schmitt, Thorsten; Dudin, Pavel; Kim, Timur K.; Cacho, Cephise; Bradlyn, Barry; Borrmann, Horst; Schmidt, Marcus; Widmer, Roland; Strocov, Vladimir N.; Felser, Claudia.

In: Science, Vol. 369, No. 6500, 10.07.2020, p. 179-183.

Research output: Contribution to journal › Article

Schröter, NBM, Stolz, S, Manna, K, De Juan, F, Vergniory, MG, Krieger, JA, Pei, D, Schmitt, T, Dudin, P, Kim, TK, Cacho, C, Bradlyn, B, Borrmann, H, Schmidt, M, Widmer, R, Strocov, VN & Felser, C 2020, 'Observation and control of maximal Chern numbers in a chiral topological semimetal', Science, vol. 369, no. 6500, pp. 179-183. https://doi.org/10.1126/science.aaz3480

Schröter, Niels B.M. ; Stolz, Samuel ; Manna, Kaustuv ; De Juan, Fernando ; Vergniory, Maia G. ; Krieger, Jonas A. ; Pei, Ding ; Schmitt, Thorsten ; Dudin, Pavel ; Kim, Timur K. ; Cacho, Cephise ; Bradlyn, Barry ; Borrmann, Horst ; Schmidt, Marcus ; Widmer, Roland ; Strocov, Vladimir N. ; Felser, Claudia. / Observation and control of maximal Chern numbers in a chiral topological semimetal. In: Science. 2020 ; Vol. 369, No. 6500. pp. 179-183.

@article{6f4c7a18863d41d28d92a49a6da1ae41,

title = "Observation and control of maximal Chern numbers in a chiral topological semimetal",

abstract = "Topological semimetals feature protected nodal band degeneracies characterized by a topological invariant known as the Chern number (C). Nodal band crossings with linear dispersion are expected to have at most |C| = 4, which sets an upper limit to the magnitude of many topological phenomena in these materials. Here, we show that the chiral crystal palladium gallium (PdGa) displays multifold band crossings, which are connected by exactly four surface Fermi arcs, thus proving that they carry the maximal Chern number magnitude of 4. By comparing two enantiomers, we observe a reversal of their Fermi-arc velocities, which demonstrates that the handedness of chiral crystals can be used to control the sign of their Chern numbers.",

author = "Schr{\"o}ter, {Niels B.M.} and Samuel Stolz and Kaustuv Manna and {De Juan}, Fernando and Vergniory, {Maia G.} and Krieger, {Jonas A.} and Ding Pei and Thorsten Schmitt and Pavel Dudin and Kim, {Timur K.} and Cephise Cacho and Barry Bradlyn and Horst Borrmann and Marcus Schmidt and Roland Widmer and Strocov, {Vladimir N.} and Claudia Felser",

year = "2020",

month = jul,

day = "10",

doi = "10.1126/science.aaz3480",

language = "English (US)",

volume = "369",

pages = "179--183",

journal = "Science",

issn = "0036-8075",

publisher = "American Association for the Advancement of Science",

number = "6500",

}

TY - JOUR

T1 - Observation and control of maximal Chern numbers in a chiral topological semimetal

AU - Schröter, Niels B.M.

AU - Stolz, Samuel

AU - Manna, Kaustuv

AU - De Juan, Fernando

AU - Vergniory, Maia G.

AU - Krieger, Jonas A.

AU - Pei, Ding

AU - Schmitt, Thorsten

AU - Dudin, Pavel

AU - Kim, Timur K.

AU - Cacho, Cephise

AU - Bradlyn, Barry

AU - Borrmann, Horst

AU - Schmidt, Marcus

AU - Widmer, Roland

AU - Strocov, Vladimir N.

AU - Felser, Claudia

PY - 2020/7/10

Y1 - 2020/7/10

N2 - Topological semimetals feature protected nodal band degeneracies characterized by a topological invariant known as the Chern number (C). Nodal band crossings with linear dispersion are expected to have at most |C| = 4, which sets an upper limit to the magnitude of many topological phenomena in these materials. Here, we show that the chiral crystal palladium gallium (PdGa) displays multifold band crossings, which are connected by exactly four surface Fermi arcs, thus proving that they carry the maximal Chern number magnitude of 4. By comparing two enantiomers, we observe a reversal of their Fermi-arc velocities, which demonstrates that the handedness of chiral crystals can be used to control the sign of their Chern numbers.

AB - Topological semimetals feature protected nodal band degeneracies characterized by a topological invariant known as the Chern number (C). Nodal band crossings with linear dispersion are expected to have at most |C| = 4, which sets an upper limit to the magnitude of many topological phenomena in these materials. Here, we show that the chiral crystal palladium gallium (PdGa) displays multifold band crossings, which are connected by exactly four surface Fermi arcs, thus proving that they carry the maximal Chern number magnitude of 4. By comparing two enantiomers, we observe a reversal of their Fermi-arc velocities, which demonstrates that the handedness of chiral crystals can be used to control the sign of their Chern numbers.

UR - http://www.scopus.com/inward/record.url?scp=85087833066&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85087833066&partnerID=8YFLogxK

U2 - 10.1126/science.aaz3480

DO - 10.1126/science.aaz3480

M3 - Article

C2 - 32646998

AN - SCOPUS:85087833066

VL - 369

SP - 179

EP - 183

JO - Science

JF - Science

SN - 0036-8075

IS - 6500

ER -