| [1] | Zudov M et al 2003 Phys. Rev. Lett. 90 046807 |
| [2] | Mani R G et al 2002 Nature 420 646 |
| [3] | Shi J and Xie X C 2003 Phys. Rev. Lett. 91 086801 |
| [4] | Durst A C et al 2003 Phys. Rev. Lett. 91 086803 |
| [5] | Fausti D et al 2011 Science 331 189 |
| [6] | Hu W, Kaiser S et al 2014 Nat. Mater. 13 705 |
| [7] | Wyatt A F G et al 1966 Phys. Rev. Lett. 16 1166 |
| [8] | Dayem A H and Wiegand J J 1967 Phys. Rev. 155 419 |
| [9] | Kommers T and Clarke J 1977 Phys. Rev. Lett. 38 1091 |
| [10] | Beck M et al 2013 Phys. Rev. Lett. 110 267003 |
| [11] | Barankov R A et al 2004 Phys. Rev. Lett. 93 160401 |
| [12] | Barankov R A and Levitov L S 2006 Phys. Rev. Lett. 96 230403 |
| [13] | Yuzbashyan E A et al 2005 Phys. Rev. B 72 220503 |
| [14] | Yuzbashyan E A et al 2006 Phys. Rev. Lett. 96 097005 |
| [15] | Schnyder A P et al 2011 Phys. Rev. B 84 214513 |
| [16] | Matsunaga R et al 2013 Phys. Rev. Lett. 111 057002 |
| [17] | Qin S Y et al 2009 Science 324 1314 |
| [18] | Zhang T et al 2010 Nat. Phys. 6 104 |
| [19] | Özer M M, Thompson J R and Weitering H H 2006 Nat. Phys. 2 173 |
| [20] | Guo Y, Zhang Y F, Bao X Y, Han T Z, Tang Z, Zhang L X, Zhu W G, Wang E, Niu Qiu Z Q, Jia J F, Zhao Z X and Xue Q K 2004 Science 306 1915 |
| [21] | Özer M M, Jia Y, Zhang Z, Thompson J R and Weitering H H 2007 Science 316 1594 |
| [22] | Josephson B D 1962 Phys. Lett. 1 251 |
| [23] | Shapiro 1963 Phys. Rev. Lett. 11 80 |
| [24] | Nambu Y and Jona-Lasinio G 1961 Phys. Rev. 122 345 |
| [25] | Gorkov L P 1959 Sov. Phys. JETP 9 1364 |
| [26] | Bardeen J, Cooper L N and Schrieffer J R 1957 Phys. Rev. 108 1175 |
| [27] | Keldysh L V 1965 Sov. Phys. JETP 8 496 |
| [28] | Haug H and Jauho A P 2008 Quantum Kinetics in Transport and Optics of Semiconductors (Berlin: Springer) chap 13 |
| [29] | Landauer R 1992 Phys. Scr. T42 110 |
| [30] | Büttiker M, Prêtre A and Thomas H 1993 Phys. Rev. Lett. 70 4114 |
| [31] | Büttiker M, Thomas H and Prêtre A 1994 Z. Phys. B Condens. Matter 94 133 |
| [32] | Jauho A P, Wingreen N S and Meir Y 1994 Phys. Rev. B 50 5528 |
| [33] | Bode H W 1945 Network Analysis and Feedback Amplifier Design (Princeton: D. Van Nostrand Company, Inc.) |
