Surface electron doping induced double gap opening in Td-WTe2
Qi-Yuan Li(李启远)1,2, Yang-Yang Lv(吕洋洋)1,3, Yong-Jie Xu(徐永杰)1,2, Li Zhu(朱立)1,2, Wei-Min Zhao(赵伟民)1,2, Yanbin Chen(陈延彬)1,2,4, and Shao-Chun Li(李绍春)1,2,4,5,†
1 National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China; 2 School of Physics, Nanjing University, Nanjing 210093, China; 3 Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China; 4 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China; 5 Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, China
Abstract By using scanning tunneling microscopy, we investigated the electronic evolution of Td-WTe2 via in-situ surface alkali K atoms deposition. The Td-WTe2 surface is electron doped upon K deposition, and as the K coverage increases, two gaps are sequentially opened near Fermi energy, which probably indicates that two phase transitions concomitantly occur during electron doping. The two gaps both show a dome-like dependence on the K coverage. While the bigger gap shows no prominent dependence on the magnetic field, the smaller one can be well suppressed and thus possibly corresponds to the superconducting transition. This work indicates that Td-WTe2 exhibits rich quantum states closely related to the carrier concentration.
(Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties)
Fund: We thank Dr. Ping Zhang and Dr. Fawei Zheng for fruitful discussions. This work was financially supported by the National Natural Science Foundation of China (Grants Nos. 11790311, 92165205, 51902152, 11874210, and 11774149) and the National Key R&D Program of China (Grants No. 2021YFA1400403).
Corresponding Authors:
Shao-Chun Li
E-mail: scli@nju.edu.cn
Cite this article:
Qi-Yuan Li(李启远), Yang-Yang Lv(吕洋洋), Yong-Jie Xu(徐永杰), Li Zhu(朱立), Wei-Min Zhao(赵伟民), Yanbin Chen(陈延彬), and Shao-Chun Li(李绍春) Surface electron doping induced double gap opening in Td-WTe2 2022 Chin. Phys. B 31 066802
[1] Law K T and Lee P A 2017 Proc. Natl. Acad. Sci. USA114 6996 [2] Wang L, Wu Y, Yu Y, Chen A, Li H, Ren W, Lu S, Ding S, Yang H, Xue Q K, Li F S and Wang G 2020 ACS Nano14 8299 [3] Wilson J A and Yoffe A D 1969 Adv. Phys.18 193 [4] Qian X, Liu J, Fu L and Li J 2014 Science346 1344 [5] Soluyanov A A, Gresch D, Wang Z, Wu Q, Troyer M, Dai X and Bernevig B A 2015 Nature527 495 [6] Haldane F D 2004 Phys. Rev. Lett.93 206602 [7] Shuichi M 2007 New J. Phys.9 356 [8] Liu Y, Shao D F, Li L J, Lu W J, Zhu X D, Tong P, Xiao R C, Ling L S, Xi C Y, Pi L, Tian H F, Yang H X, Li J Q, Song W H, Zhu X B and Sun Y P 2016 Phys. Rev. B94 045131 [9] Chen F C, Luo X, Xiao R C, Lu W J, Zhang B, Yang H X, Li J Q, Pei Q L, Shao D F, Zhang R R, Ling L S, Xi C Y, Song W H and Sun Y P 2016 Appl. Phys. Lett.108 162601 [10] Kang D, Zhou Y, Yi W, Yang C, Guo J, Shi Y, Zhang S, Wang Z, Zhang C, Jiang S, Li A, Yang K, Wu Q, Zhang G, Sun L and Zhao Z 2015 Nat. Commun.6 7804 [11] Pan X C, Chen X, Liu H, Feng Y, Wei Z, Zhou Y, Chi Z, Pi L, Yen F, Song F, Wan X, Yang Z, Wang B, Wang G and Zhang Y 2015 Nat. Commun.6 7805 [12] Qi Y, Naumov P G, Ali M N, Rajamathi C R, Schnelle W, Barkalov O, Hanfland M, Wu S C, Shekhar C, Sun Y, Suss V, Schmidt M, Schwarz U, Pippel E, Werner P, Hillebrand R, Forster T, Kampert E, Parkin S, Cava R J, Felser C, Yan B and Medvedev S A 2016 Nat. Commun.7 11038 [13] Sipos B, Kusmartseva A F, Akrap A, Berger H, Forro L and Tutis E 2008 Nat. Mater.7 960 [14] Zhang R, Tsai I L, Chapman J, Khestanova E, Waters J and Grigorieva I V 2016 Nano Lett.16 629 [15] Zhu L, Li Q Y, Lv Y Y, Li S, Zhu X Y, Jia Z Y, Chen Y B, Wen J S and Li S C 2018 Nano Lett.18 6585 [16] Hor Y S, Williams A J, Checkelsky J G, Roushan P, Seo J, Xu Q, Zandbergen H W, Yazdani A, Ong N P and Cava R J 2010 Phys. Rev. Lett.104 057001 [17] Kriener M, Segawa K, Ren Z, Sasaki S, Wada S, Kuwabata S and Ando Y 2011 Phys. Rev. B84 054513 [18] Liao M, Wang H, Zhu Y, Shang R, Rafique M, Yang L, Zhang H, Zhang D and Xue Q K 2021 Nat. Commun.12 5342 [19] Wang Z, Li R, Su C and Loh K P 2020 SmartMat1 e1013 [20] Yu Y, Yang F, Lu X F, Yan Y J, Cho Y H, Ma L, Niu X, Kim S, Son Y W, Feng D, Li S, Cheong S W, Chen X H and Zhang Y 2015 Nat. Nanotechnol.10 270 [21] Fatemi V, Wu S, Cao Y, Bretheau L, Gibson Q D, Watanabe K, Taniguchi T, Cava R J and Jarillo-Herrero P 2018 Science362 926 [22] Sajadi E, Palomaki T, Fei Z, Zhao W, Bement P, Olsen C, Luescher S, Xu X, Folk J A and Cobden D H 2018 Science362 922 [23] Piatti E, De Fazio D, Daghero D, Tamalampudi S R, Yoon D, Ferrari A C and Gonnelli R S 2018 Nano Lett.18 4821 [24] Lee J H and Son Y W 2021 Phys. Chem. Chem. Phys.23 17279 [25] Li Q, He C, Wang Y, Liu E, Wang M, Wang Y, Zeng J, Ma Z, Cao T, Yi C, Wang N, Watanabe K, Taniguchi T, Shao L, Shi Y, Chen X, Liang S J, Wang Q H and Miao F 2018 Nano Lett.18 7962 [26] Lüpke F, Waters D, De La Barrera S C, Widom M, Mandrus D G, Yan J, Feenstra R M and Hunt B M 2020 Nat. Phys.16 526 [27] Huang C, Narayan A, Zhang E, Liu Y, Yan X, Wang J, Zhang C, Wang W, Zhou T, Yi C, Liu S, Ling J, Zhang H, Liu R, Sankar R, Chou F, Wang Y, Shi Y, Law K T, Sanvito S, Zhou P, Han Z and Xiu F 2018 ACS Nano12 7185 [28] Wang H, Wang H, Liu H, Lu H, Yang W, Jia S, Liu X J, Xie X C, Wei J and Wang J 2016 Nat. Mater.15 38 [29] Aggarwal L, Gaurav A, Thakur G S, Haque Z, Ganguli A K and Sheet G 2016 Nat. Mater.15 32 [30] Wang H, Ma L and Wang J 2018 Sci. Bull.63 1141 [31] Hou X Y, Wang Z, Gu Y D, He J B, Chen D, Zhu W L, Zhang M D, Zhang F, Xu Y F, Zhang S, Yang H X, Ren Z A, Weng H M, Hao N, Lv W G, Hu J P, Chen G F and Shan L 2019 Phys. Rev. B100 235109 [32] Hou X Y, Gu Y D, Li S J, Zhao L X, Zhu W L, Wang Z, Zhang M D, Zhang F, Zhang L, Zi H, Wu Y W, Yang H X, Ren Z A, Zhang P, Chen G F, Hao N and Shan L 2020 Phys. Rev. B101 134503 [33] Lu P C, Kim J S, Yang J, Gao H, Wu J F, Shao D X, Li B, Zhou D W, Sun J, Akinwande D J, Xing D Y and Lin J F 2016 Phys. Rev. B94 224512 [34] Ali M N, Xiong J, Flynn S, Tao J, Gibson Q D, Schoop L M, Liang T, Haldolaarachchige N, Hirschberger M, Ong N P and Cava R J 2014 Nature514 205 [35] Lv H Y, Lu W J, Shao D F, Liu Y, Tan S G and Sun Y P 2015 Europhys. Lett.110 37004 [36] Jiang J, Tang F, Pan X C, Liu H M, Niu X H, Wang Y X, Xu D F, Yang H F, Xie B P, Song F Q, Dudin P, Kim T K, Hoesch M, Das P K, Vobornik I, Wan X G and Feng D L 2015 Phys. Rev. Lett.115 166601 [37] Chen Y Q, Chen Y D, Ning J A, Chen L M, Zhuang W Z, He L, Zhang R, Xu Y B and Wang X F 2020 Chin. Phys. Lett.37 017104 [38] Chen Y Q, Liu R X, Chen Y D, Yuan X, Ning J, Zhang C C, Chen L M, Wang P, He L, Zhang R, Xu Y B and Wang X F 2021 Chin. Phys. Lett.38 017101 [39] Lv Y Y, Li X, Zhang B B, Deng W Y, Yao S H, Chen Y B, Zhou J, Zhang S T, Lu M H, Zhang L, Tian M, Sheng L and Chen Y F 2017 Phys. Rev. Lett.118 096603 [40] Wang Y, Liu E, Liu H, Pan Y, Zhang L, Zeng J, Fu Y, Wang M, Xu K, Huang Z, Wang Z, Lu H Z, Xing D, Wang B, Wan X and Miao F 2016 Nat. Commun.7 13142 [41] Deng K, Wan G, Deng P, Zhang K, Ding S, Wang E, Yan M, Huang H, Zhang H, Xu Z, Denlinger J, Fedorov A, Yang H, Duan W, Yao H, Wu Y, Fan S, Zhang H, Chen X and Zhou S 2016 Nat. Phys.12 1105 [42] Jia Z Y, Song Y H, Li X B, Ran K J, Lu P C, Zheng H J, Zhu X Y, Shi Z Q, Sun J, Wen J S, Xing D Y and Li S C 2017 Phys. Rev. B96 041108 [43] Yang W, Mo C J, Fu S B, Yang Y, Zheng F W, Wang X H, Liu Y A, Hao N and Zhang P 2020 Phys. Rev. Lett.125 237006 [44] Rossi A, Resta G, Lee S H, Redwing R D, Jozwiak C, Bostwick A, Rotenberg E, Savrasov S Y and Vishik I M 2020 Phys. Rev. B102 121110 [45] Zhang W, Wu Q, Zhang L, Cheong S W, Soluyanov A A and Wu W 2017 Phys. Rev. B96 165125 [46] Yuan Y, Yang X, Peng L, Wang Z J, Li J, Yi C J, Xian J J, Shi Y G and Fu Y S 2018 Phys. Rev. B97 165435 [47] Li Q, Yan J, Yang B, Zang Y, Zhang J, He K, Wu M, Zhao Y, Mandrus D, Wang J, Xue Q, Chi L, Singh D J and Pan M 2016 Phys. Rev. B94 115419 [48] Zhang K W, Yang C L, Lei B, Lu P C, Li X B, Jia Z Y, Song Y H, Sun J, Chen X H, Li J X and Li S C 2018 Sci. Bull.63 426 [49] Jia Y Y, Wang P J, Chiu C L, Song Z D, Yu G, Jäck B, Lei S M, Klemenz S, Cevallos F A, Onyszczak M, Fishchenko N, Liu X M, Farahi G, Xie F, Xu Y F, Watanabe K, Taniguchi T, Bernevig B A, Cava R J, Schoop L M, Yazdani A and Wu S F 2021 Nat. Phys.18 87
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