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Nano Research 2020, 13(9): 2534-2540 https://doi.org/10.1007/s12274-020-2892-8
Research Article | Issue | Published: 22 June 2020

Quasiparticle interference and impurity resonances on WTe2

Show Author's Information Hyeokshin Kwon1,§,  Taehwan Jeong2,§,  Samudrala Appalakondaiah2,3,§,  Youngtek Oh1,  Insu Jeon1,  Hongki Min4,  Seongjun Park1( ),  Young Jae Song2,3,5,6( ),  Euyheon Hwang2,3( ),  Sungwoo Hwang1
Samsung Advanced Institute of Technology, Samsung Electronics Co., Suwon 16678, Republic of Korea
SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
Department of Nano Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Sungkyunkwan University, Suwon 16419, Republic of Korea

§ Hyeokshin Kwon, Taehwan Jeong, and Samudrala Appalakondaiah contributed equally to this work.

Keywords:
scanning tunneling microscopy/spectroscopy, WTe2, Weyl semimetal, quasi-particle interference
Topics:
Crystal impuritiesScanning tunneling microscopyTemperatureTopologyTransition metals
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Kwon H, Jeong T, Appalakondaiah S, et al. Quasiparticle interference and impurity resonances on WTe2. Nano Research, 2020, 13(9): 2534-2540. https://doi.org/10.1007/s12274-020-2892-8
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Abstract Full text Electronic supplementary material About this article

Using scanning tunneling microscopy/spectroscopy (STM/STS), we examine quasiparticle scattering and interference properties at the surface of WTe2. WTe2, layered transition metal dichalcogenide, is predicted to be a type-II Weyl semimetal. The Weyl fermion states in WTe2 emerge as topologically protected touching points of electron and hole pockets, and Fermi arcs connecting them can be visible in the spectral function on the surface. To probe the properties of surface states, we have conducted low-temperature STM/STS (at 2.7 K) on the surfaces of WTe2 single crystals. We visualize the surface states of WTe2 with atomic scale resolution. Clear surface states emerging from the bulk electron pocket have been identified and their connection with the bulk electronic states shows good agreement with calculations. We show the interesting double resonance peaks in the local density of states appearing at localized impurities. The low-energy resonant peak occurs near the Weyl point above the Fermi energy and it may be mixed with the surface state of Weyl points, which makes it difficult to observe the topological nature of the Weyl semimetal WTe2.


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About this article

Quasiparticle interference and impurity resonances on WTe2

Show Author's information Hyeokshin Kwon1,§, Taehwan Jeong2,§, Samudrala Appalakondaiah2,3,§, Youngtek Oh1, Insu Jeon1, Hongki Min4, Seongjun Park1( ), Young Jae Song2,3,5,6( ), Euyheon Hwang2,3( ), Sungwoo Hwang1
Samsung Advanced Institute of Technology, Samsung Electronics Co., Suwon 16678, Republic of Korea
SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
Department of Nano Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Sungkyunkwan University, Suwon 16419, Republic of Korea

§ Hyeokshin Kwon, Taehwan Jeong, and Samudrala Appalakondaiah contributed equally to this work.

Abstract

Using scanning tunneling microscopy/spectroscopy (STM/STS), we examine quasiparticle scattering and interference properties at the surface of WTe2. WTe2, layered transition metal dichalcogenide, is predicted to be a type-II Weyl semimetal. The Weyl fermion states in WTe2 emerge as topologically protected touching points of electron and hole pockets, and Fermi arcs connecting them can be visible in the spectral function on the surface. To probe the properties of surface states, we have conducted low-temperature STM/STS (at 2.7 K) on the surfaces of WTe2 single crystals. We visualize the surface states of WTe2 with atomic scale resolution. Clear surface states emerging from the bulk electron pocket have been identified and their connection with the bulk electronic states shows good agreement with calculations. We show the interesting double resonance peaks in the local density of states appearing at localized impurities. The low-energy resonant peak occurs near the Weyl point above the Fermi energy and it may be mixed with the surface state of Weyl points, which makes it difficult to observe the topological nature of the Weyl semimetal WTe2.

Keywords: scanning tunneling microscopy/spectroscopy, WTe2, Weyl semimetal, quasi-particle interference

References(46)

[1]
Young, S. M.; Zaheer, S.; Teo, J. C. Y.; Kane, C. L.; Mele, E. J.; Rappe, A. M. Dirac semimetal in three dimensions. Phys. Rev. Lett. 2012, 108, 140405.
DOI Google Scholar
[2]
Tarruell, L.; Greif, D.; Uehlinger, T.; Jotzu, G.; Esslinger, T. Creating, moving and merging Dirac points with a Fermi gas in a tunable honeycomb lattice. Nature 2012, 483, 302-305.
DOI Google Scholar
[3]
Wang, Z. J.; Sun, Y.; Chen, X. Q.; Franchini, C.; Xu, G.; Weng, H. M.; Dai, X.; Fang, Z. Dirac semimetal and topological phase transitions in A3Bi (A = Na, K, Rb). Phys. Rev. B 2012, 85, 195320.
DOI Google Scholar
[4]
Singh, B.; Sharma, A.; Lin, H.; Hasan, M. Z.; Prasad, R.; Bansil, A. Topological electronic structure and Weyl semimetal in the TlBiSe2 class of semiconductors. Phys. Rev. B 2012, 86, 115208.
DOI Google Scholar
[5]
Smith, J. C.; Banerjee, S.; Pardo, V.; Pickett, W. E. Dirac point degenerate with massive bands at a topological quantum critical point. Phys. Rev. Lett. 2011, 106, 056401.
DOI Google Scholar
[6]
Liu, C. X.; Ye, P.; Qi, X. L. Chiral gauge field and axial anomaly in a Weyl semimetal. Phys. Rev. B 2013, 87, 235306.
DOI Google Scholar
[7]
Witczak-Krempa, W.; Kim, Y. B. Topological and magnetic phases of interacting electrons in the pyrochlore iridates. Phys. Rev. B 2012, 85, 045124.
DOI Google Scholar
[8]
Xu, G.; Weng, H. M.; Wang, Z. J.; Dai, X.; Fang, Z. Chern semimetal and the quantized anomalous hall effect in HgCr2Se4. Phys. Rev. Lett. 2011, 107, 186806.
DOI Google Scholar
[9]
Kobayashi, K.; Ohtsuki, T.; Imura, K. I.; Herbut, I. F. Density of states scaling at the semimetal to metal transition in three dimensional topological insulators. Phys. Rev. Lett. 2014, 112, 016402.
DOI Google Scholar
[10]
Nandkishore, R.; Huse, D. A.; Sondhi, S. L. Rare region effects dominate weakly disordered three-dimensional dirac points. Phys. Rev. B 2014, 89, 245110.
DOI Google Scholar
[11]
Liu, Z. K.; Zhou, B.; Zhang, Y.; Wang, Z. J.; Weng, H. M.; Prabhakaran, D.; Mo, S. K.; Shen, Z. X.; Fang, Z.; Dai, X. et al. Discovery of a three-dimensional topological dirac semimetal, Na3Bi. Science 2014, 343, 864-867.
DOI Google Scholar
[12]
Borisenko, S.; Gibson, Q.; Evtushinsky, D.; Zabolotnyy, V.; Büchner, B.; Cava, R. J. Experimental realization of a three-dimensional dirac semimetal. Phys. Rev. Lett. 2014, 113, 027603.
DOI Google Scholar
[13]
Neupane, M.; Xu, S. Y.; Sankar, R.; Alidoust, N.; Bian, G.; Liu, C.; Belopolski, I.; Chang, T. R.; Jeng, H. T.; Lin, H. et al. Observation of a three-dimensional topological dirac semimetal phase in high-mobility Cd3As2. Nat. Commun. 2014, 5, 3786.
DOI Google Scholar
[14]
Wan, X. G.; Turner, A. M.; Vishwanath, A.; Savrasov, S. Y. Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates. Phys. Rev. B 2011, 83, 205101.
DOI Google Scholar
[15]
Balents, L. Weyl electrons kiss. Physics 2011, 4, 36.
DOI Google Scholar
[16]
Burkov, A. A.; Balents, L. Weyl semimetal in a topological insulator multilayer. Phys. Rev. Lett. 2011, 107, 127205.
DOI Google Scholar
[17]
Weng, H. M.; Fang, C.; Fang, Z.; Bernevig, B. A.; Dai, X. Weyl semimetal phase in noncentrosymmetric transition-metal monophosphides. Phys. Rev. X 2015, 5, 011029.
DOI Google Scholar
[18]
Hosur, P.; Qi, X. L. Recent developments in transport phenomena in Weyl semimetals. CR Phys. 2013, 14, 857-870.
DOI Google Scholar
[19]
Lv, B. Q.; Weng, H. M.; Fu, B. B.; Wang, X. P.; Miao, H.; Ma, J.; Richard, P.; Huang, X. C.; Zhao, L. X.; Chen, G. F. et al. Experimental discovery of Weyl semimetal TaAs. Phys. Rev. X 2015, 5, 031013.
DOI Google Scholar
[20]
Xu, S. Y.; Belopolski, I.; Alidoust, N.; Neupane, M.; Bian, G.; Zhang, C.; Sankar, R.; Chang, G.; Yuan, Z.; Lee, C. C. et al. Discovery of a Weyl fermion semimetal and topological Fermi arcs. Science 2015, 349, 613-617.
DOI Google Scholar
[21]
Yang, L. X.; Liu, Z. K.; Sun, Y.; Peng, H.; Yang, H. F.; Zhang, T.; Zhou, B.; Zhang, Y.; Guo, Y. F.; Rahn, M. et al. Weyl semimetal phase in the non-centrosymmetric compound TaAs. Nat. Phys. 2015, 11, 728-732.
DOI Google Scholar
[22]
Batabyal, R.; Morali, N.; Avraham, N.; Sun, Y.; Schmidt, M.; Felser, C.; Stern, A.; Yan, B. H.; Beidenkopf, H. Visualizing weakly bound surface Fermi arcs and their correspondence to bulk Weyl fermions. Sci. Adv. 2016, 2, e1600709.
DOI Google Scholar
[23]
Inoue, H.; Gyenis, A.; Wang, Z. J.; Li, J.; Oh, S. W.; Jiang, S.; Ni, N.; Bernevig, B. A.; Yazdani, A. Quasiparticle interference of the Fermi arcs and surface-bulk connectivity of a Weyl semimetal. Science 2016, 351, 1184-1187.
DOI Google Scholar
[24]
Soluyanov, A. A.; Gresch, D.; Wang, Z. J.; Wu, Q. S.; Troyer, M.; Dai, X.; Bernevig, B. A. Type-II Weyl semimetals. Nature, 2015, 527, 495-498.
DOI Google Scholar
[25]
Ali, M. N.; Xiong, J.; Flynn, S.; Tao, J.; Gibson, Q. D.; Schoop, L. M.; Liang, T.; Haldolaarachchige, N.; Hirschberger, M.; Ong, N. P. et al. Large, non-saturating magnetoresistance in WTe2. Nature 2014, 514, 205-208.
DOI Google Scholar
[26]
Kang, D. F.; Zhou, Y. Z.; Yi, W.; Yang, C. L.; Guo, J.; Shi, Y. G.; Zhang, S.; Wang, Z.; Zhang, C.; Jiang, S. et al. Superconductivity emerging from a suppressed large magnetoresistant state in tungsten ditelluride. Nat. Commun. 2015, 6, 7804.
DOI Google Scholar
[27]
Pan, X. C.; Chen, X. L.; Liu, H. M.; Feng, Y. Q.; Wei, Z. X.; Zhou, Y. H.; Chi, Z. H.; Pi, L.; Yen, F.; Song, F. Q. et al. Pressure-driven dome-shaped superconductivity and electronic structural evolution in tungsten ditelluride. Nat. Commun. 2015, 6, 7805.
DOI Google Scholar
[28]
Wu, Y.; Mou, D. X.; Jo, N. H.; Sun, K. W.; Huang, L. N.; Bud’ko, S. L.; Canfield, P. C.; Kaminski, A. Observation of Fermi arcs in the type-II Weyl semimetal candidate WTe2. Phys. Rev. B 2016, 94, 121113.
DOI Google Scholar
[29]
Bruno, F. Y.; Tamai, A.; Wu, Q. S.; Cucchi, I.; Barreteau, C.; de la Torre, A.; McKeown Walker, S.; Riccò, S.; Wang, Z.; Kim, T. K. et al. Observation of large topologically trivial Fermi arcs in the candidate type-II Weyl semimetal WTe2. Phys. Rev. B 2016, 94, 121112.
DOI Google Scholar
[30]
Sánchez-Barriga, J.; Vergniory, M. G.; Evtushinsky, D.; Aguilera, I.; Varykhalov, A.; Blügel, S.; Rader, O. Surface Fermi arc connectivity in the type-II Weyl semimetal candidate WTe2. Phys. Rev. B 2016, 94, 161401.
DOI Google Scholar
[31]
Feng, B. J.; Chan, Y. H.; Feng, Y.; Liu, R. Y.; Chou, M. Y.; Kuroda, K.; Yaji, K.; Harasawa, A.; Moras, P.; Barinov, A. et al. Spin texture in type-II Weyl semimetal WTe2. Phys. Rev. B 2016, 94, 195134.
DOI Google Scholar
[32]
Wang, C. L.; Zhang, Y.; Huang, J. W.; Nie, S. M.; Liu, G. D.; Liang, A. J.; Zhang, Y. X.; Shen, B.; Liu, J.; Hu, C. et al. Observation of Fermi arc and its connection with bulk states in the candidate type-II Weyl semimetal WTe2. Phys. Rev. B 2016, 94, 241119.
DOI Google Scholar
[33]
Sprunger, P. T.; Petersen, L.; Plummer, E. W.; Lægsgaard, E.; Besenbacher, F. Giant friedel oscillations on the beryllium(0001) surface. Science 1997, 275, 1764-1767.
DOI Google Scholar
[34]
Seo, J.; Roushan, P.; Beidenkopf, H.; Hor, Y. S.; Cava, R. J.; Yazdani, A. Transmission of topological surface states through surface barriers. Nature 2010, 466, 343-346.
DOI Google Scholar
[35]
Okada, Y.; Dhital, C.; Zhou, W. W.; Huemiller, E. D.; Lin, H.; Basak, S.; Bansil, A.; Huang, Y. B.; Ding, H.; Wang, Z. et al. Direct observation of broken time-reversal symmetry on the surface of a magnetically doped topological insulator. Phys. Rev. Lett. 2011, 106, 206805.
DOI Google Scholar
[36]
Simon, L.; Bena, C.; Vonau, F.; Cranney, M.; Aubel, D. Fourier-transform scanning tunnelling spectroscopy: The possibility to obtain constant-energy maps and band dispersion using a local measurement. J. Phys. D: Appl. Phys. 2011, 44, 464010.
DOI Google Scholar
[37]
Kresse, G.; Furthmüller, J. Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set. Comput. Mater. Sci. 1996, 6, 15-50.
DOI Google Scholar
[38]
Kresse, G.; Furthmüller, J. Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set. Phys. Rev. B 1996, 54, 11169-11186.
DOI Google Scholar
[39]
Chen, L.; Cheng, P.; Wu, K. H. Quasiparticle interference in unconventional 2D systems. J. Phys.: Condens. Matter 2017, 29, 103001.
DOI Google Scholar
[40]
Wang, J.; Li, W.; Cheng, P.; Song, C. L.; Zhang, T.; Deng, P.; Chen, X.; Ma, X. C.; He, K.; Jia, J. F. et al. Power-Law decay of standing waves on the surface of topological insulators. Phys. Rev. B 2011, 84, 235447.
DOI Google Scholar
[41]
Ceperley, D. M.; Alder, B. J. Ground state of the electron gas by a stochastic method. Phys. Rev. Lett. 1980, 45, 566-569.
DOI Google Scholar
[42]
Perdew, J. P.; Zunger, A. Self-interaction correction to density-functional approximations for many-electron systems. Phys. Rev. B 1981, 23, 5048-5079.
DOI Google Scholar
[43]
Blöchl, P. E. Projector augmented-wave method. Phys. Rev. B 1994, 50, 17953-17979.
DOI Google Scholar
[44]
Kresse, G.; Hafner, J. Ab initio molecular dynamics for open-shell transition metals. Phys. Rev. B 1993, 48, 13115-13118.
DOI Google Scholar
[45]
Sancho, M. P. L.; Sancho, J. M. L.; Sancho, J. M. L.; Rubio, J. Highly convergent schemes for the calculation of bulk and surface green functions. J. Phys. F: Met. Phys. 1985, 15, 851-858.
DOI Google Scholar
[46]
Wu, Q. S.; Zhang, S. N.; Song, H. F.; Troyer, M.; Soluyanov, A. A. WannierTools: An open-source software package for novel topological materials. Comput. Phys. Commun. 2018, 224, 405-416.
DOI Google Scholar
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Publication history
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Acknowledgements

Publication history

Received: 26 September 2019
Revised: 14 May 2020
Accepted: 21 May 2020
Published: 22 June 2020
Issue date: September 2020

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Acknowledgements

We thank K. Lee and J. Heo for useful discussions and other colleagues at the Samsung Advanced Institute of Technology (SAIT). This work has been supported by the Global Research Laboratory Program (No. 2016K1A1A2912707), Quantum Computing Development Program (No. 2019M3E4A1080227), the Basic Science Research Program (No. 2015M3A7B4050455) and the SRC Center for Topological Matter (No. 2018R1A5A6075964) through the National Research Foundation (NRF) funded by the Ministry of Science and ICT (MSIT) in Korea. This work has been supported by Industrial Strategic Technology Development Program (No. 10085617) funded by the Ministry of Trade Industry & Energy (MOTIE) in Korea. This work has been supported by Institute for Basic Science (No. IBS-R011-D1). Supercomputing resources including technical service were supported by National Institute of Supercomputing and Network through Korea Institute of Science and Technology Information (No. KSC-2018-S1-0008).

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