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双轨道Hubbard模型的动力学平均场理论研究

倪煜 孙健 全亚民 罗东奇 宋筠

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双轨道Hubbard模型的动力学平均场理论研究

倪煜, 孙健, 全亚民, 罗东奇, 宋筠

Dynamical mean-field theory of two-orbital Hubbard model

Ni Yu, Sun Jian, Quan Ya-Min, Luo Dong-Qi, Song Yun
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  • 基于以Lanczos方法为杂质求解器的动力学平均场理论, 研究了非局域轨道间跃迁对于双轨道强关联体系中轨道选择Mott相变的影响. 计算了轨道间跃迁系数不同的双轨道Hubbard模型的准粒子权重和态密度, 并构建了它们在相互作用强度U 和轨道带宽比t2/t1 影响下的相图. 通过正则变换引入两个有效的退耦和轨道, 在一定条件下轨道间跃迁会有利于轨道选择Mott相变的发生. 还比较了Bethe晶格和正方晶格的相图, 虽然基于两种不同晶格能带结构得到的轨道选择Mott相变的相变点存在一定的差异, 但其中关于轨道选择Mott相变的基本物理图像具有一致性. 并将方法拓展到半满的Ba2CuO4–δ材料的研究中, 与根据密度泛函理论得到的能带对比, 我们发现各向同性的轨道间跃迁对能带结构影响较大, 进一步采用动量空间各向异性的非局域轨道间跃迁项, 得到了材料的相图, 在半满条件下Ba2CuO4–δ应为轨道选择Mott材料.
    The effect of interorbital hopping on orbital selective Mottness in a two-band correlation system is investigated by using the dynamical mean-field theory with the Lanczos method as impurity solver. The phase diagrams of the two-orbital Hubbard model with non-local interorbital hopping (t12) , where the orbital selective Mott phases (OSMP) region is expanded by the increasing of the interorbital hopping. We compare the results obtained by self-consistent relations of Bethe lattice and squate lattice based on DMFT procedure, and the general OSMP physics of Bethe lattice is consistent with that of the square lattice while the critical points of two kinds of lattices are different. We extend the method to the study of half-filled Ba2CuO4–δ materials. By comparing with the band structure obtained from the density functional theory (DFT), it is found that the isotropic inter-orbital hopping has a great influence on the bandstructure. The DFT bandstructure in DMFT is considered, and the phase diagram of the material is obtained. The half-filled Ba2CuO4–δ should be orbital-selective Mott compound according to our results.
      通信作者: 宋筠, yunsong@bnu.edu.cn
    • 基金项目: 国家自然科学基金(11474023, 11774350)资助的课题
      Corresponding author: Song Yun, yunsong@bnu.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11474023, 11774350)
    [1]

    Anisimov V I, Nekrasov I A, Kondakov D E, Rice T M, Sigrist M 2002 Eur. Phys. J. B 25 191

    [2]

    Zhong Z, Hansmann P 2017 Phys. Rev. X 7 011023

    [3]

    Huang J, Yu R, Xu Z, Zhu J X, Jiang Q, Wang M, Wu H, Chen T, Denlinger J D, Mo S K, Hashimoto M, Gu G, Dai P, Chu J H, Lu D, Si Q, Birgeneau R J, Yi M 2021 arXiv: 2010.13913

    [4]

    Oleś A M 1983 Phys. Rev. B 28 327Google Scholar

    [5]

    Koga A, Imai Y, Kawakami N 2002 Phys. Rev. B 66 165107Google Scholar

    [6]

    Koga A, Kawakami N, Rice T M, Sigrist M 2005 Phys. Rev. B 72 045128Google Scholar

    [7]

    Kubo K 2007 Phys. Rev. B 75 224509Google Scholar

    [8]

    Georges A, Kotliar G, Krauth W, Rozenberg M J 1996 Rev. Mod. Phys. 68 13Google Scholar

    [9]

    Held K, Keller G, Eyert V, Vollhardt D, Anisimov V I 2001 Phys. Rev. Lett. 86 5345Google Scholar

    [10]

    Kotliar G, Savrasov S Y, Haule K, Oudovenko V S, Parcollet O, Marianetti C A 2006 Rev. Mod. Phys. 78 865Google Scholar

    [11]

    Zhao J Z, Zhuang J N, Deng X Y, Bi Y, Cai L C, Fang Z, Dai X 2012 Chin. Phys. B 21 057106Google Scholar

    [12]

    Liebsch A 2005 Phys. Rev. Lett. 95 116402Google Scholar

    [13]

    Peters R, Kawakami N, Pruschke T 2011 Phys. Rev. B 83 125110Google Scholar

    [14]

    Hirsch J E 1983 Phys. Rev. Lett. 51 1900Google Scholar

    [15]

    Hirsch J E 1985 Phys. Rev. B 31 4403Google Scholar

    [16]

    Chang C C, Zhang S 2008 Phys. Rev. B 78 165101Google Scholar

    [17]

    Tocchio L F, Becca F, Sorella S 2016 Phys. Rev. B 94 195126Google Scholar

    [18]

    Hanke W, Hirsch J E, 1982 Phys. Rev. B 25 6748Google Scholar

    [19]

    Shankar R 1994 Rev. Mod. Phys. 66 129Google Scholar

    [20]

    Hille C, Kugler F B, Eckhardt C J, He Y Y, Kauch A, Honerkamp C, Toschi A, Andergassen S 2020 Phys. Rev. Research 2 033372Google Scholar

    [21]

    Kotliar G, Ruckenstein A E 1986 Phys. Rev. Lett. 57 1362Google Scholar

    [22]

    Lechermann F, A Georges, Kotliar G, Parcollet O 2007 Phys. Rev. B 76 155102Google Scholar

    [23]

    Yu R, Si Q 2012 Phys. Rev. B 86 085104Google Scholar

    [24]

    Imada M, Fujimori A, Tokura Y 1998 Rev. Mod. Phys. 70 1039Google Scholar

    [25]

    Lee P A, Nagaosa N, Wen X G 2006 Rev. Mod. Phys. 78 17Google Scholar

    [26]

    Rohringer G, Hafermann H, Toschi A, Katanin A A, Antipov A E, Katsnelson M I, Lichtenstein A I, Rubtsov A N, Held K 2018 Rev. Mod. Phys. 90 025003Google Scholar

    [27]

    Song Y, Zou L J 2005 Phys. Rev. B 72 085114Google Scholar

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    Song Y, Zou L J 2009 Eur. Phys. J. B 72 59Google Scholar

    [29]

    Li W M, Zhao J F, Cao L P, Hu Z, Huang Q Z, Wang X C, Y. Liu, Zhao G Q, Zhang J, Liu Q Q, Yu R Z, Long Y W, Wu H, Lin H J, Chen C T, Li Z, Gong Z Z, Guguchia Z, Kim J S, Stewart G R, Uemura Y J, Uchida S, Jin C Q 2019 PNAS 116 12156Google Scholar

    [30]

    Liu K, Lu Z, Xiang T 2019 Phys. Rev. Mater. 3 044802Google Scholar

    [31]

    Li Y, Du S, Weng Z, Liu Z 2020 Phys. Rev. Mater. 4 044801Google Scholar

    [32]

    Wang Z, Zhou S, Chen W, Zhang F 2020 Phys. Rev. B 101 180509Google Scholar

    [33]

    Maier T, Berlijn T, Scalapino D J 2019 Phys. Rev. B 99 224515Google Scholar

    [34]

    Jiang K, Le C, Li Y, Qin S, Wang Z, Zhang F, Hu J 2021 Phys. Rev. B 103 045108Google Scholar

    [35]

    Jin H, Pickett W E, Lee K 2021 Phys. Rev. B 104 054516Google Scholar

    [36]

    Ni Y, Quan Y M, Liu J, Song Y, Zou L J 2021 Phys. Rev. B 103 214510Google Scholar

    [37]

    Niu Y, Sun J, Ni Y, Liu J, Song Y, Feng S 2019 Phys. Rev. B 100 075158Google Scholar

    [38]

    Dagotto E 1994 Rev. Mod. Phys. 66 763Google Scholar

    [39]

    Caffarel M, Krauth W 1994 Phys. Rev. Lett. 72 1545Google Scholar

    [40]

    Capone M, de’Medici L, Georges A 2007 Phys. Rev. B 76 245116Google Scholar

    [41]

    Perroni C A, Ishida H, Liebsch A 2007 Phys. Rev. B 75 045125Google Scholar

    [42]

    Georges A, de’Medici L, Mravlje J 2013 Annu. Rev. Condens. Matter Phys. 4 137Google Scholar

    [43]

    Koga A, Kawakami N, Rice T M, Sigrist M 2004 Phys. Rev. Lett. 92 216402Google Scholar

    [44]

    Costi T A, Liebsch A 2007 Phys. Rev. Lett. 99 236404Google Scholar

    [45]

    de'Medici L, Mravlje J, Georges A 2011 Phys. Rev. Lett. 107 256401Google Scholar

    [46]

    孙健, 刘洋, 宋筠 2015 物理学报 64 247101Google Scholar

    Sun J, Liu Y, Song Y 2015 Acta Phys. Sin. 64 247101Google Scholar

    [47]

    de’Medici L 2011 Phys. Rev. B 83 205112Google Scholar

  • 图 1  不同轨道间跃迁系数下两个有效轨道的准粒子权重$Z$随相互作用U 的变化曲线. 轨道α 和轨道β分别用黑色圆圈和红色三角标识, 实心标志和空心标志分别代表$t_{12}=0$$t_{12}=0.4$的情况. 体系中的洪特耦合作用$ J_{\rm{H}}=0.25 U$, 两轨道带宽比$t_2/t_1=0.4$, 所选用的能量单位为宽带跃迁系数$t_1$

    Fig. 1.  The interaction dependencies of the quasiparticle weight Z of the effective orbital α (black circles) and β (red triangles) with interorbital hopping $t_{12}=0.4$ (hollow symbols) and without interorbital hopping $t_{12}=0$ (solid symbols) when $J_{\rm{H}}=0.25 U$ and $t_2/t_1=0.4$. The energy is in unit $t_1$

    图 2  两个有效轨道的态密度随相互作用U 增加的演化图像, 体系中的轨道间跃迁$t_{12}=0.4$, 带宽比$t_2/t_1=0.4$ 以及相互作用强度$J_{\rm{H}}=0.25 U.$ 左边的图像为α轨道的结果, 右边图像为β轨道的结果, 计算中选取的能量展宽因子为$\eta=0.05$

    Fig. 2.  Evolution of the orbital-resolved spectral density$A(\omega)$ with the increasing Coulomb interaction U when $t_{12}=0.4$, $t_2/t_1=0.4$ and $J_{\rm{H}}=0.25 U.$ Left panels show the results of effective orbital α and right panels are for effective orbital β. The energy broadening factor in our calculation takes $\eta=0.05$

    图 3  轨道间跃迁系数不同时, 相互作用U和带宽比$t_2/t_1$影响下的双轨道体系相图 (a) 轨道间跃迁$t_{12}=0$; (b) 轨道间跃迁$t_{12}=0.4$. 体系的洪特耦合$J_{\rm{H}}=0.25 U$. 黑色圆圈和红色三角分别代表轨道αβ 的MIT 相变点

    Fig. 3.  Phase diagrams in the plane of interaction U and hopping integral $t_2/t_1$ of the effective two-orbital Hubbard model with different interorbital hopping, when $J_{\rm{H}}=0.25 U$: (a) $t_{12}=0$; (b) $t_{12}=0.4$. The black circles (red triangles) denote the critical points of MIT for effective orbital α(β)

    图 4  DMFT结合正方晶格能带结构所得到的结果 (a)轨道间跃迁系数不同时, 准粒子权重Z 随相互作用U 的变化曲线, 体系的洪特耦合$J_{\rm{H}}$= 0.25U, 带宽比$t_2$/$t_1$ = 0.4; (b) $t_{12}=0.4$以及$J_{\rm{H}}=0.25 U$时, 相互作用U 和带宽比$t_2/t_1$影响下的有效轨道模型相图

    Fig. 4.  DMFT results of the square lattice: (a) The interaction dependencies of the quasiparticle weight Z with different interorbital hoppings when $J_{\rm{H}}$= 0.25U and $t_2$/$t_1$ = 0.4; (b) phase diagrams in the plane of interaction U and hopping integral $t_2/t_1$ of the effective two-orbital Hubbard model when $t_{12}=0.4$ and $J_{\rm{H}}=0.25 U$

    图 5  (a) $J_{\rm{H}}=0.25 U$时有效轨道的准粒子权重随相互作用强度的变化曲线. 不同相互作用强度U下体系各有效轨道的态密度图像  (b) $U=1.0$ eV; (c) $U=2.2$ eV; (d) $U=2.5$ eV. 当相互作用2.1 eV $\leqslant U < $ 2.3 eV时体系处于OSMP

    Fig. 5.  (a) Quasiparticle weight Z as a function of interaction U when $J_{\rm{H}}=0.25 U$. The orbital-resolved spectral density $A(\omega)$ with different intraorbital interaction: (b) $U=1.0$ eV; (c) $U=2.2$ eV; (d) $U=2.5$ eV for the two effective orbitals. An OSMP occurs in a narrow interaction region with 2.1 eV $\leqslant U < $ 2.3 eV

    图 6  相互作用U和洪特耦合$J_{\rm{H}}$影响下体系的相图. 随着相互作用U的增加以及洪特耦合$J_{\rm{H}}$的减小, OSMP区域逐渐缩小, 大约在$J_{\rm{H}}=0.34$ eV以及 $U=2.7$ eV时体系中的OSMT消失

    Fig. 6.  The phase diagram of the effective two-orbital Hubbard model with interaction U and Hund's rule coupling $J_{\rm{H}}$. The region of OSMP becomes narrower with the decreasing $J_{\rm{H}}$ and increasing U, and OSMT vanishes around $J_{\rm{H}}=0.34$ eV and $U=2.7$ eV

    图 7  由不同模型得到的半满Ba2CuO$_{4-\delta}$ 体系的能带图 (a) $t_{1}$=0.504 eV, $t_{2}$=0.196 eV, $t_{12}=-0.302$ eV, $\mu_1=-0.222$ eV 和 $\mu_2=0.661$ eV的紧束缚模型所得到的能带图; (b) 根据DFT模拟的双带模型能带图像[33]

    Fig. 7.  Bandstructure for half-filling Ba2CuO3.5 with different model: (a) Tight binding model with $t_{1}$=0.504 eV, $t_{2}$=0.196 eV, $t_{12}=-0.302$ eV, $\mu_1=-0.222$ eV and $\mu_2=0.661$ eV; (b) two-orbital model according to DFT results[33].

    图 8  在DMFT中考虑DFT得到的Ba2CuO3.5完整能带结构得到的相图. 此相图与 图6中的相图定性一致

    Fig. 8.  Phase diagram of Ba2CuO3.5 obtained by the DMFT investigation using the DFT calculated band structure. The phase diagram is qualitatively consistent with Fig. 6

    表 1  半满Ba2CuO4–δ紧束缚哈密顿量中的参数(单位为eV)[33]

    Table 1.  Model parameters of the TB Hamiltonian of Ba2CuO4–δ at half-filling (unit: eV)[33]

    on-site energy (ε)1st hopping (t)2nd hopping ($t^\prime$)3rd hopping ($t^{\prime\prime}$)
    Orbital ${\rm{d}}_{x^2-y^2}$ –0.222 0.504 –0.067 0.130
    Orbital ${\rm{d}}_{3 z^2-r^2}$ 0.661 0.196 0.026 0.029
    inter-orbital 0 –0.302 0 –0.051
    下载: 导出CSV
  • [1]

    Anisimov V I, Nekrasov I A, Kondakov D E, Rice T M, Sigrist M 2002 Eur. Phys. J. B 25 191

    [2]

    Zhong Z, Hansmann P 2017 Phys. Rev. X 7 011023

    [3]

    Huang J, Yu R, Xu Z, Zhu J X, Jiang Q, Wang M, Wu H, Chen T, Denlinger J D, Mo S K, Hashimoto M, Gu G, Dai P, Chu J H, Lu D, Si Q, Birgeneau R J, Yi M 2021 arXiv: 2010.13913

    [4]

    Oleś A M 1983 Phys. Rev. B 28 327Google Scholar

    [5]

    Koga A, Imai Y, Kawakami N 2002 Phys. Rev. B 66 165107Google Scholar

    [6]

    Koga A, Kawakami N, Rice T M, Sigrist M 2005 Phys. Rev. B 72 045128Google Scholar

    [7]

    Kubo K 2007 Phys. Rev. B 75 224509Google Scholar

    [8]

    Georges A, Kotliar G, Krauth W, Rozenberg M J 1996 Rev. Mod. Phys. 68 13Google Scholar

    [9]

    Held K, Keller G, Eyert V, Vollhardt D, Anisimov V I 2001 Phys. Rev. Lett. 86 5345Google Scholar

    [10]

    Kotliar G, Savrasov S Y, Haule K, Oudovenko V S, Parcollet O, Marianetti C A 2006 Rev. Mod. Phys. 78 865Google Scholar

    [11]

    Zhao J Z, Zhuang J N, Deng X Y, Bi Y, Cai L C, Fang Z, Dai X 2012 Chin. Phys. B 21 057106Google Scholar

    [12]

    Liebsch A 2005 Phys. Rev. Lett. 95 116402Google Scholar

    [13]

    Peters R, Kawakami N, Pruschke T 2011 Phys. Rev. B 83 125110Google Scholar

    [14]

    Hirsch J E 1983 Phys. Rev. Lett. 51 1900Google Scholar

    [15]

    Hirsch J E 1985 Phys. Rev. B 31 4403Google Scholar

    [16]

    Chang C C, Zhang S 2008 Phys. Rev. B 78 165101Google Scholar

    [17]

    Tocchio L F, Becca F, Sorella S 2016 Phys. Rev. B 94 195126Google Scholar

    [18]

    Hanke W, Hirsch J E, 1982 Phys. Rev. B 25 6748Google Scholar

    [19]

    Shankar R 1994 Rev. Mod. Phys. 66 129Google Scholar

    [20]

    Hille C, Kugler F B, Eckhardt C J, He Y Y, Kauch A, Honerkamp C, Toschi A, Andergassen S 2020 Phys. Rev. Research 2 033372Google Scholar

    [21]

    Kotliar G, Ruckenstein A E 1986 Phys. Rev. Lett. 57 1362Google Scholar

    [22]

    Lechermann F, A Georges, Kotliar G, Parcollet O 2007 Phys. Rev. B 76 155102Google Scholar

    [23]

    Yu R, Si Q 2012 Phys. Rev. B 86 085104Google Scholar

    [24]

    Imada M, Fujimori A, Tokura Y 1998 Rev. Mod. Phys. 70 1039Google Scholar

    [25]

    Lee P A, Nagaosa N, Wen X G 2006 Rev. Mod. Phys. 78 17Google Scholar

    [26]

    Rohringer G, Hafermann H, Toschi A, Katanin A A, Antipov A E, Katsnelson M I, Lichtenstein A I, Rubtsov A N, Held K 2018 Rev. Mod. Phys. 90 025003Google Scholar

    [27]

    Song Y, Zou L J 2005 Phys. Rev. B 72 085114Google Scholar

    [28]

    Song Y, Zou L J 2009 Eur. Phys. J. B 72 59Google Scholar

    [29]

    Li W M, Zhao J F, Cao L P, Hu Z, Huang Q Z, Wang X C, Y. Liu, Zhao G Q, Zhang J, Liu Q Q, Yu R Z, Long Y W, Wu H, Lin H J, Chen C T, Li Z, Gong Z Z, Guguchia Z, Kim J S, Stewart G R, Uemura Y J, Uchida S, Jin C Q 2019 PNAS 116 12156Google Scholar

    [30]

    Liu K, Lu Z, Xiang T 2019 Phys. Rev. Mater. 3 044802Google Scholar

    [31]

    Li Y, Du S, Weng Z, Liu Z 2020 Phys. Rev. Mater. 4 044801Google Scholar

    [32]

    Wang Z, Zhou S, Chen W, Zhang F 2020 Phys. Rev. B 101 180509Google Scholar

    [33]

    Maier T, Berlijn T, Scalapino D J 2019 Phys. Rev. B 99 224515Google Scholar

    [34]

    Jiang K, Le C, Li Y, Qin S, Wang Z, Zhang F, Hu J 2021 Phys. Rev. B 103 045108Google Scholar

    [35]

    Jin H, Pickett W E, Lee K 2021 Phys. Rev. B 104 054516Google Scholar

    [36]

    Ni Y, Quan Y M, Liu J, Song Y, Zou L J 2021 Phys. Rev. B 103 214510Google Scholar

    [37]

    Niu Y, Sun J, Ni Y, Liu J, Song Y, Feng S 2019 Phys. Rev. B 100 075158Google Scholar

    [38]

    Dagotto E 1994 Rev. Mod. Phys. 66 763Google Scholar

    [39]

    Caffarel M, Krauth W 1994 Phys. Rev. Lett. 72 1545Google Scholar

    [40]

    Capone M, de’Medici L, Georges A 2007 Phys. Rev. B 76 245116Google Scholar

    [41]

    Perroni C A, Ishida H, Liebsch A 2007 Phys. Rev. B 75 045125Google Scholar

    [42]

    Georges A, de’Medici L, Mravlje J 2013 Annu. Rev. Condens. Matter Phys. 4 137Google Scholar

    [43]

    Koga A, Kawakami N, Rice T M, Sigrist M 2004 Phys. Rev. Lett. 92 216402Google Scholar

    [44]

    Costi T A, Liebsch A 2007 Phys. Rev. Lett. 99 236404Google Scholar

    [45]

    de'Medici L, Mravlje J, Georges A 2011 Phys. Rev. Lett. 107 256401Google Scholar

    [46]

    孙健, 刘洋, 宋筠 2015 物理学报 64 247101Google Scholar

    Sun J, Liu Y, Song Y 2015 Acta Phys. Sin. 64 247101Google Scholar

    [47]

    de’Medici L 2011 Phys. Rev. B 83 205112Google Scholar

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出版历程
  • 收稿日期:  2022-02-17
  • 修回日期:  2022-03-24
  • 上网日期:  2022-07-03
  • 刊出日期:  2022-07-20

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