Abstract
Topological semimetals in crystals with a chiral structure (which possess a handedness due to a lack of mirror and inversion symmetries) are expected to display numerous exotic physical phenomena, including fermionic excitations with large topological charge1, long Fermi arc surface states2,3, unusual magnetotransport4 and lattice dynamics5, as well as a quantized response to circularly polarized light6. So far, all experimentally confirmed topological semimetals exist in crystals that contain mirror operations, meaning that these properties do not appear. Here, we show that AlPt is a structurally chiral topological semimetal that hosts new four-fold and six-fold fermions, which can be viewed as a higher spin generalization of Weyl fermions without equivalence in elementary particle physics. These multifold fermions are located at high symmetry points and have Chern numbers larger than those in Weyl semimetals, thus resulting in multiple Fermi arcs that span the full diagonal of the surface Brillouin zone. By imaging these long Fermi arcs, we experimentally determine the magnitude and sign of their Chern number, allowing us to relate their dispersion to the handedness of their host crystal.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 759-765 |
| Number of pages | 7 |
| Journal | Nature Physics |
| Volume | 15 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 1 2019 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
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Chiral topological semimetal with multifold band crossings and long Fermi arcs. / Schröter, Niels B.M.; Pei, Ding; Vergniory, Maia G.; Sun, Yan; Manna, Kaustuv; de Juan, Fernando; Krieger, Jonas A.; Süss, Vicky; Schmidt, Marcus; Dudin, Pavel; Bradlyn, Barry; Kim, Timur K.; Schmitt, Thorsten; Cacho, Cephise; Felser, Claudia; Strocov, Vladimir N.; Chen, Yulin.
In: Nature Physics, Vol. 15, No. 8, 01.08.2019, p. 759-765.Research output: Contribution to journal › Letter
}
TY - JOUR
T1 - Chiral topological semimetal with multifold band crossings and long Fermi arcs
AU - Schröter, Niels B.M.
AU - Pei, Ding
AU - Vergniory, Maia G.
AU - Sun, Yan
AU - Manna, Kaustuv
AU - de Juan, Fernando
AU - Krieger, Jonas A.
AU - Süss, Vicky
AU - Schmidt, Marcus
AU - Dudin, Pavel
AU - Bradlyn, Barry
AU - Kim, Timur K.
AU - Schmitt, Thorsten
AU - Cacho, Cephise
AU - Felser, Claudia
AU - Strocov, Vladimir N.
AU - Chen, Yulin
PY - 2019/8/1
Y1 - 2019/8/1
N2 - Topological semimetals in crystals with a chiral structure (which possess a handedness due to a lack of mirror and inversion symmetries) are expected to display numerous exotic physical phenomena, including fermionic excitations with large topological charge1, long Fermi arc surface states2,3, unusual magnetotransport4 and lattice dynamics5, as well as a quantized response to circularly polarized light6. So far, all experimentally confirmed topological semimetals exist in crystals that contain mirror operations, meaning that these properties do not appear. Here, we show that AlPt is a structurally chiral topological semimetal that hosts new four-fold and six-fold fermions, which can be viewed as a higher spin generalization of Weyl fermions without equivalence in elementary particle physics. These multifold fermions are located at high symmetry points and have Chern numbers larger than those in Weyl semimetals, thus resulting in multiple Fermi arcs that span the full diagonal of the surface Brillouin zone. By imaging these long Fermi arcs, we experimentally determine the magnitude and sign of their Chern number, allowing us to relate their dispersion to the handedness of their host crystal.
AB - Topological semimetals in crystals with a chiral structure (which possess a handedness due to a lack of mirror and inversion symmetries) are expected to display numerous exotic physical phenomena, including fermionic excitations with large topological charge1, long Fermi arc surface states2,3, unusual magnetotransport4 and lattice dynamics5, as well as a quantized response to circularly polarized light6. So far, all experimentally confirmed topological semimetals exist in crystals that contain mirror operations, meaning that these properties do not appear. Here, we show that AlPt is a structurally chiral topological semimetal that hosts new four-fold and six-fold fermions, which can be viewed as a higher spin generalization of Weyl fermions without equivalence in elementary particle physics. These multifold fermions are located at high symmetry points and have Chern numbers larger than those in Weyl semimetals, thus resulting in multiple Fermi arcs that span the full diagonal of the surface Brillouin zone. By imaging these long Fermi arcs, we experimentally determine the magnitude and sign of their Chern number, allowing us to relate their dispersion to the handedness of their host crystal.
UR - http://www.scopus.com/inward/record.url?scp=85065425895&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85065425895&partnerID=8YFLogxK
U2 - 10.1038/s41567-019-0511-y
DO - 10.1038/s41567-019-0511-y
M3 - Letter
AN - SCOPUS:85065425895
VL - 15
SP - 759
EP - 765
JO - Nature Physics
JF - Nature Physics
SN - 1745-2473
IS - 8
ER -