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				Yu-Shiba-Rusinov states are subgap bound states induced by magnetic impurity atoms in a superconductor. These states can be used as building blocks in constructing an effective topological superconductor. Here we formulate a unified theory of topological superconductivity in different dimensions based on Yu-Shiba-Rusinov states, and demonstrate its application with simple but illustrative examples. Such a theory underlies a number of recent experiments on the related platform.- 
										Keywords:
										
- topological phase /
- topological superconductivity /
- Majorana fermion /
- magnetic impurity /
- Yu-Shiba-Rusinov state
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Phys. 75 076501  Google Scholar Google Scholar[40] Mourik V, Zuo K, Frolov S M, Plissard S R, Bakkers E P A M, Kouwenhoven L P 2012 Science 336 1003  Google Scholar Google Scholar[41] Das A, Ronen Y, Most Y, Oreg Y, Heiblum M, Shtrikman H 2012 Nat. Phys. 8 887  Google Scholar Google Scholar[42] Rokhinson L P, Liu X, Furdyna J K 2012 Nat. Phys. 8 795  Google Scholar Google Scholar[43] Deng M T, Yu C L, Huang G Y, Larsson M, Caroff P, Xu H Q 2012 Nano Lett. 12 6414  Google Scholar Google Scholar[44] Sun H H, Zhang K W, Hu L H, et al. 2016 Phys. Rev. Lett. 116 257003  Google Scholar Google Scholar[45] Hu L H, Li C, Xu D H, Zhou Y, Zhang F C 2016 Phys. Rev. B 94 224501  Google Scholar Google Scholar[46] Wang D, Kong L, Fan P, et al. 2018 Science 362 333  Google Scholar Google Scholar[47] Liu Q, Chen C, Zhang T, et al. 2018 Phys. Rev. X 8 041056 [48] Jäck B, Xie Y, Li J, Jeon S, Bernevig B A, Yazdani A 2019 Science 364 1255  Google Scholar Google Scholar[49] Peng Y, Pientka F, Glazman L I, von Oppen F 2015 Phys. Rev. Lett. 114 106801  Google Scholar Google Scholar[50] Duan W, Li J unpublished [51] Altland A, Zirnbauer M R 1997 Phys. Rev. B 55 1142 [52] Thouless D J, Kohmoto M, Nightingale M P, den Nijs M 1982 Phys. Rev. Lett. 49 405 [53] Wilczek F 2009 Nat. Phys. 5 614  Google Scholar Google Scholar[54] Elliott S R, Franz M 2015 Rev. Mod. Phys. 87 137  Google Scholar Google Scholar[55] Ivanov D A 2001 Phys. Rev. Lett. 86 268  Google Scholar Google Scholar[56] Fidkowski L, Kitaev A 2010 Phys. Rev. B 81 134509  Google Scholar Google Scholar[57] Fidkowski L, Kitaev A 2011 Phys. Rev. B 83 075103  Google Scholar Google Scholar
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[1] Kitaev A Y 2001 Physics-Uspekhi 44 131  Google Scholar Google Scholar[2] Read N, Green D 2000 Phys. Rev. B 61 10267. [3] Fu L, Kane C L 2008 Phys. Rev. Lett. 100 096407  Google Scholar Google Scholar[4] Kitaev A 2009 AIP Conference Proceedings 1134 22 [5] Schnyder A P, Ryu S, Furusaki A, Ludwig A W W 2009 AIP Conference Proceedings 1134 10 [6] Ryu S, Schnyder A P, Furusaki A, Ludwig A W W 2010 New J. Phys. 12 065010  Google Scholar Google Scholar[7] Qi X L, Zhang S C 2011 Rev. Mod. Phys. 83 1057  Google Scholar Google Scholar[8] Beenakker C 2013 Ann. Rev. Condens. Matter Phys. 4 113  Google Scholar Google Scholar[9] Chiu C K, Teo J C, Schnyder A P, Ryu S 2016 Rev. Mod. Phys. 88 035005  Google Scholar Google Scholar[10] Lutchyn R M, Bakkers E P A M, Kouwenhoven L P, Krogstrup P, Marcus C M, Oreg Y 2017 arXiv: 1707.04899 [11] Kitaev A Y 2003 Ann. Phys. 303 2  Google Scholar Google Scholar[12] Nayak C, Simon S, Stern A, Freedman M, Das Sarma S 2008 Rev. Mod. Phys. 80 1083  Google Scholar Google Scholar[13] 于渌 1965 物理学报 21 75  Google Scholar Google ScholarYu L 1965 Acta Phys. Sin. 21 75  Google Scholar Google Scholar[14] Shiba H 1968 Pro. Theo. Phys. 40 435  Google Scholar Google Scholar[15] Rusinov A I 1969 Soviet Phys. JETP 29 1101 [16] Choy T P, Edge J M, Akhmerov A R, Beenakker C W J 2011 Physi. Rev. B 84 195442  Google Scholar Google Scholar[17] Martin I, Morpurgo A F 2012 Phys. Rev. B 85 144505  Google Scholar Google Scholar[18] Nadj-Perge S, Drozdov I K, Bernevig B A, Yazdani A 2013 Phys. Rev. B 88 020407  Google Scholar Google Scholar[19] Klinovaja J, Stano P, Yazdani A, Loss D 2013 Phys. Rev. Lett. 111 186805  Google Scholar Google Scholar[20] Braunecker B, Simon P 2013 Phys. Rev. Lett. 111 147202  Google Scholar Google Scholar[21] Vazifeh M M, Franz M 2013 Phys. Rev. Lett. 111 206802  Google Scholar Google Scholar[22] Pientka F, Glazman L I, von Oppen F 2013 Phys. Rev. B 88 155420  Google Scholar Google Scholar[23] Nadj-Perge S, Drozdov I K, Li J, et al. 2014 Science 346 602  Google Scholar Google Scholar[24] Li J, Chen H, Drozdov I K, Yazdani A, Bernevig B A, MacDonald A H 2014 Phys. Rev. B 90 235433  Google Scholar Google Scholar[25] Röntynen J, Ojanen T 2015 Phys. Rev. Lett. 114 236803  Google Scholar Google Scholar[26] Westström A, Pöyhönen K, Ojanen T 2015 Phys. Rev. B 91 064502  Google Scholar Google Scholar[27] Li J, Neupert T, Bernevig B A, Yazdani A 2016 Nat. Commun. 7 10395  Google Scholar Google Scholar[28] Li J, Neupert T, Wang Z, MacDonald A H, Yazdani A, Bernevig B A 2016 Nat. Commun. 7 12297  Google Scholar Google Scholar[29] Feldman B E, Randeria M T, Li J, et al. 2017 Nat. Phys. 13 286  Google Scholar Google Scholar[30] Jeon S, Xie Y, Li J, Wang Z, Bernevig B A, Yazdani A 2017 Science 358 772 [31] Li J, Jeon S, Xie Y, Yazdani A, Bernevig B A 2018 Phys. Rev. B 97 125119  Google Scholar Google Scholar[32] Pöyhönen K, Sahlberg I, Westström A, Ojanen T 2018 Nat. Commun. 9 2103 [33] Kim H, Palacio-Morales A, Posske T, et al. 2018 Science Advances 4 eaar5251  Google Scholar Google Scholar[34] Palacio-Morales A, Mascot E, Cocklin S, et al. 2019 Science Advances 5 eaav6600 [35] Yazdani A, Jones B A, Lutz C P, Crommie M F, Eigler D M 1997 Science 275 1767  Google Scholar Google Scholar[36] Sarma S D, Freedman M, Nayak C 2015 npj Quantum Information 1 15001  Google Scholar Google Scholar[37] Lutchyn R M, Sau J D, Das Sarma S 2010 Phys. Rev. Lett. 105 077001  Google Scholar Google Scholar[38] Oreg Y, Refael G, von Oppen F 2010 Phys. Rev. Lett. 105 177002  Google Scholar Google Scholar[39] Alicea J 2012 Rep. Prog. Phys. 75 076501  Google Scholar Google Scholar[40] Mourik V, Zuo K, Frolov S M, Plissard S R, Bakkers E P A M, Kouwenhoven L P 2012 Science 336 1003  Google Scholar Google Scholar[41] Das A, Ronen Y, Most Y, Oreg Y, Heiblum M, Shtrikman H 2012 Nat. Phys. 8 887  Google Scholar Google Scholar[42] Rokhinson L P, Liu X, Furdyna J K 2012 Nat. Phys. 8 795  Google Scholar Google Scholar[43] Deng M T, Yu C L, Huang G Y, Larsson M, Caroff P, Xu H Q 2012 Nano Lett. 12 6414  Google Scholar Google Scholar[44] Sun H H, Zhang K W, Hu L H, et al. 2016 Phys. Rev. Lett. 116 257003  Google Scholar Google Scholar[45] Hu L H, Li C, Xu D H, Zhou Y, Zhang F C 2016 Phys. Rev. B 94 224501  Google Scholar Google Scholar[46] Wang D, Kong L, Fan P, et al. 2018 Science 362 333  Google Scholar Google Scholar[47] Liu Q, Chen C, Zhang T, et al. 2018 Phys. Rev. X 8 041056 [48] Jäck B, Xie Y, Li J, Jeon S, Bernevig B A, Yazdani A 2019 Science 364 1255  Google Scholar Google Scholar[49] Peng Y, Pientka F, Glazman L I, von Oppen F 2015 Phys. Rev. Lett. 114 106801  Google Scholar Google Scholar[50] Duan W, Li J unpublished [51] Altland A, Zirnbauer M R 1997 Phys. Rev. B 55 1142 [52] Thouless D J, Kohmoto M, Nightingale M P, den Nijs M 1982 Phys. Rev. Lett. 49 405 [53] Wilczek F 2009 Nat. Phys. 5 614  Google Scholar Google Scholar[54] Elliott S R, Franz M 2015 Rev. Mod. Phys. 87 137  Google Scholar Google Scholar[55] Ivanov D A 2001 Phys. Rev. Lett. 86 268  Google Scholar Google Scholar[56] Fidkowski L, Kitaev A 2010 Phys. Rev. B 81 134509  Google Scholar Google Scholar[57] Fidkowski L, Kitaev A 2011 Phys. Rev. B 83 075103  Google Scholar Google Scholar
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