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Two-step growth of high-quality Nb/(Bi0.5Sb0.5)2Te3/Nb heterostructures for topological Josephson junctions

  • Hui Zhang (a1), Xiaodong Ma (a2), Lin Li (a3), Deler Langenberg (a4), Chang Gan Zeng (a5) and Guo Xing Miao (a3)...

Abstract

The topological insulator/superconductor heterostructure is one of the most promising platforms to create and manipulate Majorana bound states. Here, we used molecular beam epitaxy to grow high-quality (Bi0.5Sb0.5)2Te3 films on Nb surfaces. To promote proper (Bi0.5Sb0.5)2Te3 film nucleation in the early growth stage, we developed a two-step growth method. Bi, Sb, and Te clusters were first evaporated at a low temperature of 180 °C, which is below the typical growth temperature and then annealed to form a crystalized passivation layer. Second, a standard (Bi0.5Sb0.5)2Te3 film was grown under the normal deposition temperature of 280 °C. We used reflection high-energy electron diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction to further characterize the (Bi0.5Sb0.5)2Te3 film and passivation layer quality. Finally, the top Nb film was laid down by magnetron sputtering at room temperature. The hetero-Nb/epitaxial (Bi0.5Sb0.5)2Te3/Nb stacks were further fabricated into micro-Josephson junctions and showed clear Josephson currents demonstrating an excellent material quality.

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Corresponding author

a)Address all correspondence to this author. e-mail: guo-xing.miao@uwaterloo.ca

References

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1.Ivanov, D.A.: Non-abelian statistics of half-quantum vortices in p-wave superconductors. Phys. Rev. Lett. 86, 268271 (2001).
2.Catherine, K.: Chiral p-wave order in Sr2RuO4. Rep. Prog. Phys. 75, 042501 (2012).
3.Ando, Y. and Fu, L.: Topological crystalline insulators and topological superconductors: From concepts to materials. Annu. Rev. Condens. Matter. Phys. 6, 361 (2015).
4.Mourik, V., Zuo, K., Frolov, S.M., Plissard, S.R., Bakkers, E.P.A.M., and Kouwenhoven, L.P.: Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices. Science 336, 1003 (2012).
5.Sau, J.D., Lutchyn, R.M., Tewari, S., and Sarma, S.D.: Generic new platform for topological quantum computation using semiconductor heterostructures. Phys. Rev. Lett. 104, 040502 (2010).
6.Zhang, H., Liu, C-X., Qi, X-L., Dai, X., Fang, Z., and Zhang, S-C.: Topological insulators in Bi2Se3, Bi2Te3, and Sb2Te3 with a single Dirac cone on the surface. Nat. Phys. 5, 438 (2009).
7.Chen, Y.L., Analytis, J.G., Chu, J-H., Liu, Z.K., Mo, S-K., Qi, X.L., Zhang, H.J., Lu, D.H., Dai, X., Fang, Z., Zhang, S.C., Fisher, I.R., Hussain, Z., and Shen, Z-X.: Experimental realization of a three-dimensional topological insulator, Bi2Te3. Science 325, 178 (2009).
8.Xia, Y., Qian, D., Hsieh, D., Wray, L., Pal, A., Lin, H., Bansil, A., Grauer, D., Hor, Y.S., Cava, R.J., and Hasan, M.Z.: Observation of a large-gap topological-insulator class with a single Dirac cone on the surface. Nat. Phys. 5, 398 (2009).
9.Hsieh, D., Xia, Y., Wray, L., Qian, D., Pal, A., Dil, J.H., Osterwalder, J., Meier, F., Bihlmayer, G., Kane, C.L., Hor, Y.S., Cava, R.J., and Hasan, M.Z.: Observation of unconventional quantum spin textures in topological insulators. Science 323, 919 (2009).
10.Fu, L. and Kane, C.L.: Superconducting proximity effect and Majorana fermions at the surface of a topological insulator. Phys. Rev. Lett. 100, 096407 (2008).
11.Kitaev, A.Yu.: Fault-tolerant quantum computation by anyons. Ann. Phys. 303, 2 (2003).
12.Nayak, C., Simon, S.H., Stern, A., Freedman, M., and Sarma, S.D.: Non-abelian anyons and topological quantum computation. Rev. Mod. Phys. 80, 1083 (2008).
13.Wang, M-X., Liu, C., Xu, J-P., Yang, F., Miao, L., Yao, M-Y., Gao, C.L., Shen, C., Ma, X., Chen, X., Xu, Z-A., Liu, Y., Zhang, S-C., Qian, D., Jia, J-F., and Xue, Q-K.: The coexistence of superconductivity and topological order in the Bi2Se3 thin films,. Science 336, 52 (2012).
14.Xu, J-P., Liu, C., Wang, M-X., Ge, J., Liu, Z-L., Yang, X., Chen, Y., Liu, Y., Xu, Z-A., Gao, C-L., Qian, D., Zhang, F-C., and Jia, J-F.: Artificial topological superconductor by the proximity effect. Phys. Rev. Lett. 112, 217001 (2014).
15.Xu, J-P., Wang, M-X., Liu, Z.L., Ge, J-F., Yang, X., Liu, C., Xu, Z.A., Guan, D., Gao, C.L., Qian, D., Liu, Y., Wang, Q-H., Zhang, F-C., Xue, Q-K., and Jia, J-F.: Experimental detection of a Majorana mode in the core of a magnetic vortex inside a topological insulator-superconductor Bi2Te3/NbSe2 heterostructure. Phys. Rev. Lett. 114, 017001 (2015).
16.Sun, H-H., Zhang, K-W., Hu, L-H., Li, C., Wang, G-Y., Ma, H-Y., Xu, Z-A., Gao, C-L., Guan, D-D., Li, Y-Y., Liu, C., Qian, D., Zhou, Y., Fu, L., Li, S-C., Zhang, F-C., and Jia, J-F.: Majorana zero mode detected with spin selective Andreev reflection in the vortex of a topological superconductor. Phys. Rev. Lett. 116, 257003 (2016).
17.Xu, S-Y., Alidoust, N., Belopolski, I., Richardella, A., Liu, C., Neupane, M., Bian, G., Huang, S-H., Sankar, R., Fang, C., Dellabetta, B., Dai, W., Li, Q., Gilbert, M.J., Chou, F., Samarth, N., and Hasan, M.Z.: Momentum-space imaging of Cooper pairing in a half-Dirac-gas topological superconductor. Nat. Phys. 10, 943 (2014).
18.Zareapour, P., Hayat, A., Zhao, S.Y.F., Kreshchuk, M., Jain, A., Kwok, D.C., Lee, N., Cheong, S-W., Xu, Z., Yang, A., Gu, G.D., Jia, S., Cava, R.J., and Burch, K.S.: Proximity-induced high-temperature superconductivity in the topological insulators Bi2Se3 and Bi2Te3. Nat. Commun. 3, 1056 (2012).
19.Wang, E., Ding, H., Fedorov, A.V., Yao, W., Li, Z., Lv, Y-F., Zhao, K., Zhang, L-G., Xu, Z., Schneeloch, J., Zhong, R., Ji, S-H., Wang, L., He, K., Ma, X., Gu, G., Yao, H., Xue, Q-K., Chen, X., and Zhou, S.: Fully gapped topological surface states in Bi2Se3 films induced by a d-wave high-temperature superconductor. Nat. Phys. 9, 621 (2013).
20.Koren, G. and Kirzhner, T.: Zero-energy bound states in tunneling conductance spectra at the interface of an s-wave superconductor and a topological insulator in NbN/Bi2Se3/Au thin-film junctions. Phys. Rev. B 86, 144508 (2012).
21.Koren, G., Kirzhner, T., Kalcheim, Y., and Millo, O.: Signature of proximity-induced p x + ip y triplet pairing in the doped topological insulator Bi2Se3 by the s-wave superconductor NbN. Europhys. Lett. 103, 67010 (2013).
22.Koren, G.: Proximity effects at the interface of a superconductor and a topological insulator in NbN–Bi2Se3 thin film bilayers. Supercond. Sci. Technol. 28, 2 (2014).
23.Koren, G.: Reflections on the first year of PLD of high temperature superconducting thin films and some recent advances in PLD of topological superconducting NbN–Bi2Se3–Au junctions. Mater. Sci. Eng., A 4, 334 (2014).
24.He, Q.L., Pan, L., Stern, A.L., Burks, E.C., Che, X., Yin, G., Wang, J., Lian, B., Zhou, Q., Choi, E.S., Murata, K., Kou, X., Chen, Z., Nie, T., Shao, Q., Fan, Y., Zhang, S-C., Liu, K., Xia, J., and Wang, K.L.: Chiral Majorana fermion modes in a quantum anomalous Hall insulator–superconductor structure. Science 357, 294 (2017).
25.Williams, J.R., Bestwick, A.J., Gallagher, P., Hong, S.S., Cui, Y., Bleich, A.S., Analytis, J.G., Fisher, I.R., and Gordon, D.G.: Unconventional Josephson effect in hybrid superconductor-topological insulator devices. Phys. Rev. Lett. 109, 056803 (2012).
26.Veldhorst, M., Molenaar, C.G., Wang, X.L., Hilgenkamp, H., and Brinkman, A.: Experimental realization of superconducting quantum interference devices with topological insulator junctions. Appl. Phys. Lett. 100, 072602 (2012).
27.Cho, S., Dellabetta, B., Yang, A., Schneeloch, J., Xu, Z., Valla, T., Gu, G., Gilbert, M.J., and Mason, N.: Symmetry protected Josephson supercurrents in three-dimensional topological insulators. Nat. Commun. 4, 1689 (2013).
28.Pang, Y., Wang, J.H., Lyu, Z.Z., Yang, G., Fan, J., Liu, G.T., Ji, Z.Q., Jing, X.N., Yang, C.L., and Lu, L.: Spatially resolved gap closing in single Josephson junctions constructed on Bi2Te3 surface. Chin. Phys. B 25, 117402 (2016).
29.Chiu, C-K., Gilbert, M.J., and Hughes, T.L.: Vortex lines in topological insulator-superconductor heterostructures. Phys. Rev. B 84, 144507 (2011).
30.Fan, Y., Upadhyaya, P., Kou, X., Lang, M., Takei, S., Wang, Z., Tang, J., He, L., Chang, L-T., Montazeri, M., Yu, G., Jiang, W., Nie, T., Schwartz, R.N., Tserkovnyak, Y., and Wang, K.L.: Magnetization switching through giant spin–orbit torque in a magnetically doped topological insulator heterostructure. Nat. Mater. 13, 699 (2014).
31.Kou, X., He, L., Lang, M., Fan, Y., Wong, K., Jiang, Y., Nie, T., Jiang, W., Upadhyaya, P., Xing, Z., Wang, Y., Xiu, F., Schwartz, R.N., and Wang, K.L.: Manipulating surface-related ferromagnetism in modulation-doped topological insulators. Nano Lett. 13, 4587 (2013).
32.Zhang, Y., He, K., Chang, C-Z., Song, C-L., Wang, L-L., Chen, X., Jia, J-F., Fang, Z., Dai, X., Shan, W-Y., Shen, S-Q., Niu, Q., Qi, X-L., Zhang, S-C., Ma, X-C., and Xue, Q-K.: Crossover of the three-dimensional topological insulator Bi2Se3 to the two-dimensional limit. Nat. Phys. 6, 584 (2010).
33.Zhang, J., Chang, C-Z., Zhang, Z., Wen, J., Feng, X., Li, K., Liu, M., He, K., Wang, L., Chen, X., Xue, Q-K., Ma, X., and Wang, Y.: Band structure engineering in (Bi1−xSbx)2Te3 ternary topological insulators. Nat. Commun. 2, 574 (2011).
34.Tang, Y.C., Zhang, H., Kwon, S., Mohebbi, H.R., Cory, D.G., Peng, L.C., Gu, L., Guo, H.Z., Jin, K.J., and Miao, G.X.: Superconducting resonators based on TiN/tapering/NbN/tapering/TiN heterostructures. Adv. Eng. Mater 18, 1816 (2016).
35.Jerng, S-K., Joo, K., Kim, Y., Yoon, S-M., Lee, J.H., Kim, M., Kim, J.S., Yoon, E., Chuna, S-H., and Kim, Y.S.: Ordered growth of topological insulator Bi2Se3 thin films on dielectric amorphous SiO2 by MBE. Nanoscale 5, 10618 (2013).
36.Bansal, N., Kim, Y.S., Edrey, E., Brahlek, M., Horibe, Y., Iida, K., Tanimura, M., Li, G-H., Feng, T., Lee, H-D., Gustafsson, T., Andrei, E., and Oh, S.: Epitaxial growth of topological insulator Bi2Se3 film on Si(111) with atomically sharp interface. Thin Solid Films 520, 224 (2011).
37.Li, H.D., Wang, Z.Y., Kan, X., Guo, X., He, H.T., Wang, Z., Wang, J.N., Wong, T.L., Wang, N., and Xie, M.H.: The Van der Waals epitaxy of Bi2Se3 on the vicinal Si(111) surface: An approach for preparing high-quality thin films of a topological insulator. New J. Phys. 12, 103038 (2010).
38.Wang, Z.Y., Li, H.D., Guo, X., Ho, W.K., and Xie, M.H.: Growth characteristics of topological insulator Bi2Se3 films on different substrates. J. Cryst. Growth 334, 96 (2011).
39.Li, L., Zhang, H., Yang, Y., and Miao, G.X.: High-quality epitaxial MgB2 Josephson junctions grown by molecular beam epitaxy. Adv. Eng. Mater 19, 1600792 (2017).

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