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In this paper, the time-reversal (TR) symmetry broken quantum spin Hall (QSH) in Lieb lattice is investigated in the presence of both Rashba spin-orbit coupling (SOC) and uniform exchange field. The Lieb lattice has a simple cubic symmetry, and it has three different sites in each unit cell. The most distinctive feature of this model is that it contains only one Dirac-cone in the first Brillouin zone, where the upper dispersive band and the lower dispersive band touch the middle zero-energy band at M point and form a cone-like dispersion. The intrinsic SOC is essentially needed to open the full energy gap in the bulk. When the intrinsic SOC is nonzero, all the band structures are separated everywhere in the Brillouin zone and can be characterized by some topological invariants. The exact QSH first put forward by Kane and Mele in 2005 is characterized by the z2 number. The protection from the TR symmetry ensures the gapless crossing in the surface state in the bulk gap. In our model, the presence of the exchange field breaks the TR symmetry, which results in opening a small gap in the crossing point and the z2 topological order is not suitable for the system. This kind of state is a TR symmetry broken QSH, which is characterized by the spin Chern numbers. The spin Chern numbers have a much wider scope of application than z2 index. It is suitable for both TR symmetry system and the TR symmetry broken system. For Lieb lattice ribbons, the spin polarization and the wave-function distributions are obtained numerically. There exists a weak scattering between the counter-propagating states in the TR symmetry broken QSH, and the spin transport along the boundary with a low dissipation replaces the dissipationless spin current in a TR symmetry system. In experiment, such a system can be realized by the two-dimensional Fermi gases in optical lattice with Lieb symmetry. The above conclusions are expected to give theoretical guidance in the spin device and the quantum information.
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Keywords:
- quantum spin Hall effect /
- spin-orbit coupling /
- topological order
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[2] Tsui D C, Stormer H L, Gossard A C 1982 Phys. Rev. Lett. 48 1559
[3] Kane C L, Mele E J 2005 Phys. Rev. Lett. 95 226801
[4] Zhang H J, Xu Y, Wang J, Chang K, Zhang S C 2014 Phys. Rev. Lett. 112 216803
[5] Miao M S, Yan Q, van de Wall C G, Lou W K, Li L L, Chang K 2012 Phys. Rev. Lett. 109 186803
[6] Zhang D, Lou W K, Miao M S, Zhang S C, Chang K 2013 Phys. Rev. Lett. 111 156402
[7] Hasan M Z, Kane C L 2010 Rev. Mod. Phys. 82 3045
[8] Qi X L, Zhang S C 2010 Physics Today 63 33
[9] Li Z J, Li Q, Chen Z G, Li H B, Fang Y 2014 Chin. Phys. B 23 028102
[10] Thouless D J, Kohmoto M, Nightingale M P, Den Nijs M 1982 Phys. Rev. Lett. 49 405
[11] Kane C L, Mele E J 2005 Phys. Rev. Lett. 95 146802
[12] Bernevig B A, Hughes T L, Zhang S C 2006 Science 314 1757
[13] Konig M, Wiedmann S, Brune C, Roth A, Buthmann H, Molenkamp L W, Qi X L, Zhang S C 2007 Science 318 766
[14] Sheng D N, Weng Z Y, Sheng L, Haldane F D M 2006 Phys. Rev. Lett. 97 036808
[15] Yang Y Y, Xu Z, Sheng L, Wang B G, Xing D Y, Sheng D N 2011 Phys. Rev. Lett. 107 066602
[16] Pradan E 2009 Phys. Rev. B 80 125327
[17] Qiao Z H, Yang S A, Feng W X, Tse W K, Ding J, Yao Y G, Wang J, Niu Q 2010 Phys. Rev. B 82 161414
[18] Haldane F D M 1988 Phys. Rev. Lett. 61 2015
[19] Onoda M, Nagaosa N 2003 Phys. Rev. Lett. 90 206601
[20] Liu C X, Qi X L, Dai X, Fang Z, Zhang S C 2008 Phys. Rev. Lett. 101 146802
[21] Raghu S, Chung S B, Qi X L, Zhang S C 2010 Phys. Rev. Lett. 104 116401
[22] Yu R, Zhang W, Zhang H J, Zhang S C, Dai X, Fang Z 2010 Science 329 61
[23] Wu C 2008 Phys. Rev. Lett. 101 186807
[24] Guo H M, Franz M 2009 Phys. Rev. B 80 113102
[25] Zhang Z Y 2011 J. Phys. Condens. Matter 23 365801
[26] Ishizuka H, Motome Y 2013 Phys. Rev. B 87 081105
[27] Kargarian M, Fiete G A 2010 Phys. Rev. B 82 085106
[28] Chen W C, Liu R, Wang Y F, Gong C D 2012 Phys. Rev. B 86 085311
[29] Ohgushi K, Murakami S, Nagaosa N 2000 Phys. Rev. B 62 R6065
[30] Wang Z, Zhang P 2008 Phys. Rev. B 77 125119
[31] Shen R, Shao L B, Wang B, Xing D Y 2010 Phys. Rev. B 81 041410
[32] Beugeling W, Everts J C, Morais S C 2012 Phys. Rev. B 86 195129
[33] Zhao A, Shen S Q 2012 Phys. Rev. B 85 085209
[34] Weeks C, Franz M 2010 Phys. Rev. B 82 085310
[35] Sun K, Fradkin E 2008 Phys. Rev. B 78 245122
[36] He Y, Moore J, Varma C M 2012 Phys. Rev. B 85 155106
[37] Stanescu T D, Galitski V, Vaishnav J Y, Clark C W, Das Sarma S 2009 Phys. Rev. A 79 053639
[38] Zhu S L, Fu H, Wu C J, Zhang S C, Duan L M 2006 Phys. Rev. Lett. 97 240401
[39] Bloch I, Dalibard J, Zwerger W 2008 Rev. Mod. Phys. 80 885
[40] Goldman N, Urban D F, Bercioux D 2011 Phys. Rev. A 83 063601
[41] Gibertini M, Singha A, Pellegrini V, Polini M, Vignale G, Pinczuk A, Pfeiffer L N, West K W 2009 Phys. Rev. B 79 241406
[42] Zhang C, Tewari S, Lutchyn R M, Das Sarma S 2008 Phys. Rev. Lett. 101 160401
[43] Chosh P, Sau J D, Tewari S, Das Sarma S 2010 Phys. Rev. B 82 184525
[44] Temari S, Sau J D 2012 Phys. Rev. Lett. 109 150408
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[1] Klitzing K V, Dorda G, Pepper M 1980 Phys. Rev. Lett. 45 494
[2] Tsui D C, Stormer H L, Gossard A C 1982 Phys. Rev. Lett. 48 1559
[3] Kane C L, Mele E J 2005 Phys. Rev. Lett. 95 226801
[4] Zhang H J, Xu Y, Wang J, Chang K, Zhang S C 2014 Phys. Rev. Lett. 112 216803
[5] Miao M S, Yan Q, van de Wall C G, Lou W K, Li L L, Chang K 2012 Phys. Rev. Lett. 109 186803
[6] Zhang D, Lou W K, Miao M S, Zhang S C, Chang K 2013 Phys. Rev. Lett. 111 156402
[7] Hasan M Z, Kane C L 2010 Rev. Mod. Phys. 82 3045
[8] Qi X L, Zhang S C 2010 Physics Today 63 33
[9] Li Z J, Li Q, Chen Z G, Li H B, Fang Y 2014 Chin. Phys. B 23 028102
[10] Thouless D J, Kohmoto M, Nightingale M P, Den Nijs M 1982 Phys. Rev. Lett. 49 405
[11] Kane C L, Mele E J 2005 Phys. Rev. Lett. 95 146802
[12] Bernevig B A, Hughes T L, Zhang S C 2006 Science 314 1757
[13] Konig M, Wiedmann S, Brune C, Roth A, Buthmann H, Molenkamp L W, Qi X L, Zhang S C 2007 Science 318 766
[14] Sheng D N, Weng Z Y, Sheng L, Haldane F D M 2006 Phys. Rev. Lett. 97 036808
[15] Yang Y Y, Xu Z, Sheng L, Wang B G, Xing D Y, Sheng D N 2011 Phys. Rev. Lett. 107 066602
[16] Pradan E 2009 Phys. Rev. B 80 125327
[17] Qiao Z H, Yang S A, Feng W X, Tse W K, Ding J, Yao Y G, Wang J, Niu Q 2010 Phys. Rev. B 82 161414
[18] Haldane F D M 1988 Phys. Rev. Lett. 61 2015
[19] Onoda M, Nagaosa N 2003 Phys. Rev. Lett. 90 206601
[20] Liu C X, Qi X L, Dai X, Fang Z, Zhang S C 2008 Phys. Rev. Lett. 101 146802
[21] Raghu S, Chung S B, Qi X L, Zhang S C 2010 Phys. Rev. Lett. 104 116401
[22] Yu R, Zhang W, Zhang H J, Zhang S C, Dai X, Fang Z 2010 Science 329 61
[23] Wu C 2008 Phys. Rev. Lett. 101 186807
[24] Guo H M, Franz M 2009 Phys. Rev. B 80 113102
[25] Zhang Z Y 2011 J. Phys. Condens. Matter 23 365801
[26] Ishizuka H, Motome Y 2013 Phys. Rev. B 87 081105
[27] Kargarian M, Fiete G A 2010 Phys. Rev. B 82 085106
[28] Chen W C, Liu R, Wang Y F, Gong C D 2012 Phys. Rev. B 86 085311
[29] Ohgushi K, Murakami S, Nagaosa N 2000 Phys. Rev. B 62 R6065
[30] Wang Z, Zhang P 2008 Phys. Rev. B 77 125119
[31] Shen R, Shao L B, Wang B, Xing D Y 2010 Phys. Rev. B 81 041410
[32] Beugeling W, Everts J C, Morais S C 2012 Phys. Rev. B 86 195129
[33] Zhao A, Shen S Q 2012 Phys. Rev. B 85 085209
[34] Weeks C, Franz M 2010 Phys. Rev. B 82 085310
[35] Sun K, Fradkin E 2008 Phys. Rev. B 78 245122
[36] He Y, Moore J, Varma C M 2012 Phys. Rev. B 85 155106
[37] Stanescu T D, Galitski V, Vaishnav J Y, Clark C W, Das Sarma S 2009 Phys. Rev. A 79 053639
[38] Zhu S L, Fu H, Wu C J, Zhang S C, Duan L M 2006 Phys. Rev. Lett. 97 240401
[39] Bloch I, Dalibard J, Zwerger W 2008 Rev. Mod. Phys. 80 885
[40] Goldman N, Urban D F, Bercioux D 2011 Phys. Rev. A 83 063601
[41] Gibertini M, Singha A, Pellegrini V, Polini M, Vignale G, Pinczuk A, Pfeiffer L N, West K W 2009 Phys. Rev. B 79 241406
[42] Zhang C, Tewari S, Lutchyn R M, Das Sarma S 2008 Phys. Rev. Lett. 101 160401
[43] Chosh P, Sau J D, Tewari S, Das Sarma S 2010 Phys. Rev. B 82 184525
[44] Temari S, Sau J D 2012 Phys. Rev. Lett. 109 150408
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