TY - JOUR
T1 - Observation of Nodal-Line Plasmons in ZrSiS
AU - Xue, Siwei
AU - Wang, Maoyuan
AU - Li, Yong
AU - Zhang, Shuyuan
AU - Jia, Xun
AU - Zhou, Jianhui
AU - Shi, Youguo
AU - Zhu, Xuetao
AU - Yao, Yugui
AU - Guo, Jiandong
N1 - Publisher Copyright:
© 2021 American Physical Society
PY - 2021/10/29
Y1 - 2021/10/29
N2 - Nodal-line semimetals (NLSMs), a large family of new topological phases of matter with continuous linear band crossing points in the momentum space, attract considerable attention. Here, we report the direct observation of plasmons originating from topological nodal-line states in a prototypical NLSM ZrSiS by high-resolution electron energy loss spectroscopy. There exist three temperature-independent plasmons with energies ranging from the near- to the mid-infrared frequencies. With first-principles calculations of a slab model, these plasmons can be ascribed to the correlations of electrons in the bulk nodal lines and their projected surface states, dubbed nodal-line plasmons. An anomalous surface plasmon has higher excitation energy than the bulk plasmon due to the larger contribution from the nodal-line projected surface states. This work reveals the novel plasmons related to the unique nodal-line states in a NLSM.
AB - Nodal-line semimetals (NLSMs), a large family of new topological phases of matter with continuous linear band crossing points in the momentum space, attract considerable attention. Here, we report the direct observation of plasmons originating from topological nodal-line states in a prototypical NLSM ZrSiS by high-resolution electron energy loss spectroscopy. There exist three temperature-independent plasmons with energies ranging from the near- to the mid-infrared frequencies. With first-principles calculations of a slab model, these plasmons can be ascribed to the correlations of electrons in the bulk nodal lines and their projected surface states, dubbed nodal-line plasmons. An anomalous surface plasmon has higher excitation energy than the bulk plasmon due to the larger contribution from the nodal-line projected surface states. This work reveals the novel plasmons related to the unique nodal-line states in a NLSM.
UR - http://www.scopus.com/inward/record.url?scp=85118407312&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.127.186802
DO - 10.1103/PhysRevLett.127.186802
M3 - Article
C2 - 34767385
AN - SCOPUS:85118407312
SN - 0031-9007
VL - 127
JO - Physical Review Letters
JF - Physical Review Letters
IS - 18
M1 - 186802
ER -