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大部分铁基超导体的正常态呈现坏金属行为, 这表明体系中存在较强的电子关联效应. 最近的实验与理论研究显示, 铁基超导体中的电子关联具有多轨道的特征. 本文介绍与评论铁基超导体多轨道哈伯德模型中电子关联方面理论研究的最新进展; 着重讨论以隶自旋技术为代表的一系列量子多体计算方法在研究多轨道系统中金属绝缘体相变的应用. 理论计算给出了铁基超导体多轨道哈伯德模型基于电子关联的基态相图. 在对应母体化合物的电子填充数时, 基态存在从金属到绝缘体的莫特转变. 临近莫特转变, 体系呈现坏金属行为; 其电子性质存在较强的轨道选择性. 轨道选择性的强弱与体系中的洪德耦合和轨道的晶体场劈裂密切相关. 对钾铁硒系统, 研究发现其基态相图存在轨道选择莫特相: 其中铁的3d xy轨道已被莫特局域化, 但其他3d轨道电子仍具有巡游性. 这一新相的发现, 对理解以钾铁硒为代表的一大类铁基超导体正常态与超导之间的联系提供了重要线索.We review the recent theoretical progress of the multiorbital effects on the electron correlations in iron-based superconductors. Studying the metal-to-insulator transitions of the multiorbital Hubbard models for parent compounds of iron-based superconductors, a Mott transition is generally realized. The natures of both the Mott insulating and the metallic phases are affected by the Hund's rule coupling. In alkaline iron selenides, Hund's rule coupling stabilizes a novel orbital-selective Mott phase, in which the iron 3d xy orbital is Mott localized, while other 3d orbitals are still itinerant. We discuss the effects of the orbital selectivity on normal state properties and the superconductivity of the iron-based systems.
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Keywords:
- iron-based superconductors /
- multiorbital Hubbard model /
- Mott transition /
- orbital selectivity
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-
[1] Kamihara Y, Watanabe T, Hirano M, Hosono H 2008 J. Am. Chem. Soc. 130 3296
[2] Ren Z A, Lu W, Yang J, et al. 2008 Chin. Phys. Lett. 25 2215
[3] Hsu F C, Luo J Y, Yeh K W, et al. 2008 Proc. Natl. Acad. Sci. USA 105 14262
[4] Guo J, Jin S, Wang G, et al. 2010 Phys. Rev. B 82 180520
[5] Fang M, Wang H D, Dong C H, et al. 2011 Euro Phys. Lett. 94 27009
[6] Wang Q Y, Li Z, Zhang W H, et al. 2012 Chin. Phys. Lett. 29 037402
[7] He S, He J, Zhang W, et al. 2013 Nat. Mater. 12 605
[8] Lee J J, Schmitt F T, Moore R G, et al. 2014 Nature 515 245
[9] Zhang Z, Wang Y, Song Q, et al. 2015 Sci. Bull. 60 1301
[10] Ge J F, Liu Z L, Liu C, et al. 2015 Nat. Mater. 14 285
[11] Bardeen J, Cooper L, Schrieffer J R 1957 Phys. Rev. 106 162
[12] Cho A 2010 Science 327 1320
[13] de la Cruz C, Huang Q, Lynn J W, et al. 2008 Nature 453 899
[14] Yi M, Lu D H, Analytis J G, et al. 2009 Phys. Rev. B 80 024515
[15] Hussey N E, Takenaka K, Takagi H 2004 Philoso. Mag. 84 2847
[16] Qazilbash M, Hamlin J J, Baumbach R E, et al. 2009 Nat. Phys. 5 647
[17] Liu M, Harriger L W, Luo H, et al. 2012 Nat. Phys. 8 376
[18] Tamai A, Ganin A Y, Rozbicki E, et al. 2010 Phys. Rev. Lett. 104 097002
[19] Yi M, Lu D H, Yu R, et al. 2013 Phys. Rev. Lett. 110 067003
[20] Yi M, Liu Z K, Zhang Y et al. 2015 Nat. Commun. 6 7777
[21] Bao W, Huang Q Z, Chen G F, et al. 2011 Chin. Phys. Lett. 28 086104
[22] Castellani C, Natoli C R, Ranninger J 1978 Phys. Rev. B 18 4945
[23] Kotliar G, Ruckenstein A E 1986 Phys. Rev. Lett. 57 1362
[24] Florens S, Georges A 2004 Phys. Rev. B 70 035114
[25] de'Medici, L Georges A, Biermann S 2005 Phys. Rev. B 72 205124
[26] Hassan S R, de'Medici L 2010 Phys. Rev. B 81 035106
[27] Yu R, Si Q 2012 Phys. Rev. B 86 085104
[28] Yu R, Si Q 2013 Phys. Rev. Lett. 110 146402
[29] Zhu J X, Yu R, Wang H, et al. 2010 Phys. Rev. Lett. 104 216405
[30] Yu R, Zhu J X, Si Q 2011 Phys. Rev. Lett. 106 186401
[31] Goswami P, Nikolic P, Si Q 2010 Europhys. Lett. 91 37006
[32] Yu R, Goswami P, Si Q, Nikolic P, Zhu J X 2013 Nat. Commun. 4 2783
[33] Yu R, Zhu J X, Si Q 2014 Phys. Rev. B 89 024509
[34] Ge Q Q, Ye Z R, Xu M, et al. 2013 Phys. Rev. X 3 011020
[35] Zhang C, Yu R, Su Y, et al. 2013 Phys. Rev. Lett. 111 207002
[36] Nica E, Yu R, Si Q 2015 arXiv:1505.04170
[37] Mou D, Liu S, Jia X, et al. 2011 Phys. Rev. Lett. 106 107001
[38] Wang X P, Qian T, Richard P, et al. 2011 Europhys. Lett. 93 57001
[39] Wang X P, Richard P, Shi X, et al. 2012 Europhys. Lett. 99 67001
[40] Park J T, Friemel G, Li Y, et al. 2011 Phys. Rev. Lett. 107 177005
[41] Friemel G, Park J T, Maier T A, et al. 2012 Phys. Rev. B 85 140511
[42] Sato T, Nakayama K, Sekiba Y, et al. 2009 Phys. Rev. Lett. 103 047002
[43] Reid J-Ph, Tanatar M A, Juneau-Fecteau A, et al. 2012 Phys. Rev. Lett. 109 087001
[44] Okazaki K, Ota Y, Kotani Y, et al. 2012 Science 337 1314
[45] Hong X C, Li X L, Pan B Y, et al. 2013 Phys. Rev. B 87 144502
[46] Zhang Z, Wang A F, Hong X C, et al. 2015 Phys. Rev. B 91 024502
[47] Hardy F, Böhmer A E, Aoki D, et al. 2013 Phys. Rev. Lett. 111 027002
[48] Wang A F, Pan B Y, Luo X G, et al. 2013 Phys. Rev. B 87 214509
[49] Wang P, Zhou P, Dai J, et al. 2015 arXiv:1503.08298
[50] Eilers F, Grube K, Zocco D A, et al. 2015 arXiv:1510.01857
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