Abstract
The low-energy electron band structure of Cu\(_2\)Si on Si(111) has been investigated using angle-resolved photoemission spectroscopy. Cu\(_2\)Si exhibits two Dirac nodal-lines, stemming from the crossing of one electron-pocket with two hole-pockets, that are protected by mirror reflection symmetry. When Cu\(_2\)Si is placed on Si(111), the hole-pockets and their satellite bands due to the quasi-\(5\times 5\) periodicity are clearly observed whereas the electron-pocket is observed with very weak spectral intensity. Interestingly, close to the Fermi energy, the hole-pockets exhibit almost linear energy-momentum dispersion when their spectral width is also linearly proportional to energy. These findings indicate that Cu\(_2\)Si on Si(111) can host Dirac nodal-line fermions, of which low-energy excitations might depart from those of the conventional Fermi liquid.
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References
A.A. Burkov, M.D. Hook, L. Balents, Phys. Rev. B 84, 235126 (2011)
C. Fang, H. Weng, X. Dai, Z. Fang, Chin. Phys. B 25, 117106 (2016)
H. Weng, X. Dai, Z. Fang, J. Phys.: Condens. Matter 28, 303001 (2016)
C. Fang, Y. Chen, H.-Y. Kee, L. Fu, Phys. Rev. Lett. 115, 036806 (2015a)
B. Feng et al., Nat. Commun. 8, 1007 (2017)
C. Fang, Y. Chen, H.-Y. Kee, L. Fu, Phys. Rev. B 92, 081202(R) (2015b)
Y. Chen, H.-S. Kim, H.-Y. Kee, Phys. Rev. B 93, 155140 (2016)
G. Bian et al., Nat. Commun. 7, 10556 (2016)
C.-J. Yi et al., Phys. Rev. B 97, 201107(R) (2018)
Z. Liu et al., Phys. Rev. X 8, 031044 (2018)
B.-B. Fu et al., Sci. Adv. 5, eaau6459 (2019)
A.C. Ferrari et al., Nanoscale 7, 4598 (2015)
J.-L. Lu, W. Luo, X.-Y. Li, S.-Q. Yang, J.-X. Cho, X.-G. Gong, H.-J. Xiang, Chin. Phys. Lett. 34, 057302 (2017)
Y.-J. Jin, R. Wang, J.-Z. Zhao, Y.-P. Du, C.-D. Zheng, L.-Y. Gan, J.-F. Liu, H. Xu, S.Y. Tong, Nanoscale 9, 13112 (2017)
L.-M. Yang, V. Bac̆ić, I.A. Popov, A.I. Boldyrev, T. Heine, T. Frauenheim, E. Ganz, J. Am. Chem. Soc. 137, 2757 (2015)
S.A. Chambers, S.B. Anderson, J.H. Weaver, Phys. Rev. B 32, 581 (1985)
R.B. Doak, D.B. Nguyen, Phys. Rev. B 40, 1495 (1989)
N.J. Curson, H.G. Bullman, J.R. Buckland, W. Allison, Phys. Rev. B 55, 10819 (1997)
M. Cameau et al., Phys. Rev. Mater. 3, 044004 (2019)
K.-H. Kang, T.-G. Im, J.-J. Lee, J.-D. Lee, S.-W. Han, J.-I. Chung, J.-S. Kang, New Physics: Saemulli 47, 327 (2003)
K. Koepernik, H. Eschrig, Phys. Rev. B 59, 1743 (1999)
I. Opahle, K. Koepernik, H. Eschrig, Phys. Rev. B 60, 14035 (1999)
S. Kim, J. Kim, H.J. Choi, Y.-W. Son, Phys. Rev. Lett. 100, 176802 (2008)
A.H. Castro Neto, F. Guinea, N.M.R. Peres, K.S. Novoselov, A.K. Geim, Rev. Mod. Phys. 81, 110 (2009)
C. Kirkegaard, T.K. Kim, Ph Hofmann, New J. Phys. 7, 99 (2005)
Y. Huh, E.G. Moon, Y.B. Kim, Phys. Rev. B 93, 035138 (2016)
A. Damascelli, Z. Hussain, Z.-X. Shen, Rev. Mod. Phys. 75, 474 (2003)
E. Abrahams, J. Korean Phys. Soc. 29, 18 (1996)
S.Y. Zhou, D.A. Siegel, A.V. Fedorov, A. Lanzara, Phys. Rev. B 78, 193404 (2008)
D.A. Siegel, C.-H. Park, C. Hwang, J. Deslippe, A.V. Fedorov, S.G. Louie, A. Lanzara, Proc. Natl. Acad. Sci. U.S.A. 108, 11365 (2011)
C. Hwang, D.A. Siegel, S.-K. Mo, W. Regan, A. Ismach, Y. Zhang, A. Zettl, A. Lanzara, Sci. Rep. 2, 590 (2012)
Acknowledgements
We acknowledge experimental help from A. Lanzara. This work was supported by a 2-Year Research Grant from Pusan National University.
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Joo, HJ., Hwang, C. & Kim, K. The low-energy electron band structure of a two-dimensional Dirac nodal-line semimetal grown on a silicon surface. J. Korean Phys. Soc. 78, 34–39 (2021). https://doi.org/10.1007/s40042-020-00016-8
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DOI: https://doi.org/10.1007/s40042-020-00016-8