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有序-无序二维耦合系统的电子输运性质

陆艳艳 王超 刘洁 蒋金益 钟建新

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有序-无序二维耦合系统的电子输运性质

陆艳艳, 王超, 刘洁, 蒋金益, 钟建新

Electron transport properties of order-disorder separated two-dimensional bilayer systems

Lu Yan-Yan, Wang Chao, Liu Jie, Jiang Jin-Yi, Zhong Jian-Xin
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  • 基于双层耦合正方晶格的紧束缚近似模型, 通过对态密度、波函数格点占据数和量子扩散的计算与分析, 系统研究了不同堆垛界面结构、层间耦合强度和无序强度对有序-无序双层二维耦合系统中电子输运性质的影响. 研究发现, AA堆垛双层耦合正方晶格在层间耦合较弱时保持单一能带, 带尾态为局域态, 带中态始终保持延展态及近似延展态的临界态, 存在不随无序增强而消失的迁移率边; 对于强耦合体系, 弱无序时能带的带尾态为临界态, 带中态为扩展态, 而强无序使得耦合导致的两能带交叠为单一能带, 其带尾态为局域态, 带中态为临界态. AB堆垛双层耦合正方晶格的能带始终为单一能带, 且能带中心区始终包含延展态和临界态. 对于AAAB堆垛两种构型, 有序-无序双层耦合系统的量子扩散随无序强度增大均呈现出先减弱再增强的反常量子扩散现象. AA型弱耦合系统和AB型耦合系统中的量子扩散均表现为超扩散, AA型强耦合系统中弱无序导致超扩散, 而强无序导致亚扩散. 计算结果进一步表明, 有序-无序双层耦合六角晶格系统表现出同样的行为.
    In the framework of the electronic tight-binding model of order-disorder separated (ODS) bilayer square lattice (BSL) and by calculating the density of states (DOS), participation number of eigen-wavefunctions and quantum diffusion, we systematically study the effects of stacking interface structure, strength of interlayer coupling and degree of disorder on the electron transport properties of order-disorder separated two-dimensional bilayer systems. Our results show that for the ODS-BSL of AA-stacking in the regime of weak coupling, the ODS-BSL always possesses a single energy band with localized states in its band tail, and extended states or critical states similar to the extended ones in the band center region with persistent metal-insulator transitions and associated mobility edges under strong disorder. In the regime of strong coupling, weak disorder leads the critical states to exist in its band tails and extended states to occur in the band center regions, while strong disorder results in the formation of a single band due to the overlapping of the coupling-induced two bands with localized states in the band tails and critical states in the band center region with increasing participation numbers as disorder increases. The ODS-BSL of AB-stacking always possesses a single band and supports extended states and critical states in its band center region, regardless of the strengths of interlayer coupling and disorder. In both ODS-BSL systems of AA- and AB- stackings, quantum diffusion undergoes an anomalous transition from weakening to enhancing behaviors as disorder increases. In the AA-stacking ODS-BSL of weak coupling, AA-stacking ODS-BSL of weak disorder and the AB-stacking ODS-BSL, quantum diffusion exhibits super-diffusion due to the contribution of extended states and the critical states similar to extended ones. In the AA-stacking ODS-BSL of strong coupling, quantum diffusion undergoes sub-diffusion under strong disorder due to the existence of critical states. The numerical results also show that the order-disorder separated (ODS) bilayer hexagonal lattice exhibits the same behaviors as those revealed in ODS-BSL systems.
      通信作者: 钟建新, jxzhong@xtu.edu.cn
    • 基金项目: 国家自然科学基金(批准号: 11874316, 11474244)、国家基础研究发展计划(批准号: 2015CB921103)和湖南省政府国际访问教师项目资助的课题.
      Corresponding author: Zhong Jian-Xin, jxzhong@xtu.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11874316, 11474244), the National Basic Research Program of China (Grant No. 2015CB921103), and the International Visiting Faculty Program of Hunan Provincial Government, China.
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  • 图 1  有序-无序双层耦合正方晶格模型图($\varepsilon _i^{\left( 2 \right)}$, $\varepsilon _i^{\left( 1 \right)}$)分别表示上、下层格点能, $ U $h分别表示层间与层内最近邻格点跃迁能) (a) AA堆垛 (上层原子位于下层原子正上方); (b) AB堆垛 (上层原子位于下层正方格子中心正上方)

    Fig. 1.  Schematic illustration of the order-disorder coupling system of bilayer square lattices ($\varepsilon _i^{\left( 2 \right)}$, $\varepsilon _i^{\left( 1 \right)}$) are onsite energies of upper and lower layers, $ U $ and h represent the hoping energy of inter-layer and intra-layer respectively): (a) AA stacking (the upper atom is directly above the lower atom); (b) AB stacking (the upper atom is located directly above the center of the lower square).

    图 2  双层耦合正方周期晶格的能带与DOS (a), (b) 分别为$ U $ = 1和$ U $= 6的AA型耦合系统的能带图; (c) AA型耦合晶格的DOS 随$ U $的变化; (d), (e) 分别为$ U $= 1和$ U $= 6的AB型耦合系统的能带图; (f) AB型耦合晶格的DOS随$ U $的变化

    Fig. 2.  Energy spectra and DOS for the periodic coupling system of bilayer square lattices: (a), (b) Energy spectra for the coupling system of AA stacking with $ U $= 1 and $ U $= 6, respectively; (c) variation of DOS with $ U $ for the coupling system of AA stacking; (d), (e) energy spectra for the coupling system of AB stacking with $ U $ = 1 and $ U $ = 6, respectively; (f) the variation of DOS with $ U $ for the coupling system of AB stacking.

    图 3  AA型堆垛有序-无序双层耦合正方晶格电子能谱 (a)—(d) DOS随$ U $$ W $的变化; (e) 产生带隙所对应的$ U $$ W $(空心圆)及其拟合线(虚线); (f) 带隙宽度$ \Delta E $$ U\rm{和}W $的变化, 左图为$ \Delta E $ (空心符号)随$ U $的变化及其拟合线(虚线), 其中$ W $= 1, 3, 5分别对应斜率1.99, 1.96, 1.90; 右图为$ \Delta E $ (空心符号)随$ W $的变化及其拟合线(虚线), 其中$ U $ = 6, 8, 10分别对应斜率–0.40, –0.44, –0.50

    Fig. 3.  Energy spectra for the order-disorder bilayer coupling system of square lattices with AA stacking: (a)–(d) Changes of the DOS for different $ U $ and $ W $; (e) the relationship of $ W $ and $ U $ (open circles) for the band-gap opening with the linear fitting (dashed line); (f) the dependence of bandgap width $ \Delta E $ (hollow symbols) on $ U $ and W with the left panel for $ U $ with the linear fitting (dash lines), where $ W $= 1, 3, 5 correspond to the slopes of 1.99, 1.96, 1.90, respectively, and the right panel for $ W $with the linear fitting (dash lines), where $ U $= 6, 8, 10 correspond to the slopes –0.40, –0.44, –0.50, respectively.

    图 4  AB堆垛有序-无序双层耦合正方晶格DOS分布 (a), (b) DOS随无序强度W的变化; (c), (d) DOS随层间耦合能U的变化

    Fig. 4.  DOS for order-disorder bilayer coupling system of the square lattices with AB stacking: (a), (b) Changes of the DOS for different $ W $; (c), (d) changes of the DOS for different $ U $.

    图 5  AA型堆垛有序-无序双层耦合正方晶格本征态波函数分布图(其中D-L和O-L分别代表上层无序晶格和下层有序晶格) (a), (b) 分别为弱耦合系统($ U $= 0.5)在弱无序($ W $= 1)和强无序($ W $= 10)时的带中态(E = 0.140, 0.016)和带尾态(E = 4.60, 11.46)的波函数$ {\left|\boldsymbol{\varPhi }\left(E\right)\right|}^{2} $分布; (c), (d) 分别为强耦合系统($ U $= 4)在弱无序($ W $= 1)和强无序($ W $= 10)时的带中态(E = 3.86, –0.17)和带尾态(E = 8.08, 12.96)的波函数$ {\left|\boldsymbol{\varPhi }\left(E\right)\right|}^{2} $分布; 黑色表示概率大于 0.005

    Fig. 5.  Eigen-wavefunctions $ {\left|\boldsymbol{\varPhi }\left(E\right)\right|}^{2} $ for the bilayer coupling system of square lattices with AA stacking, where D-L and O-Lrepresent the upper disordered layer and the lower ordered layer respectively: (a), (b) Eigen-wavefunctions of the eigen-states (E = 0.140, 0.016) in the spectral central region and the eigen-states (E = 4.60, 11.46) in the tail region for the weak coupling system of $ U $= 0.5 with small disorder of $ W $= 1 and strong disorder of $ W $= 10, respectively; (c), (d) the eigen-wavefunctions of the eigen-states (E = 3.86, –0.17) in the spectral central region and the eigen-states (E = 8.08, 12.96) in tail region for the strong coupling system of $ U $= 4 with small disorder of $ W $= 1 and strong disorder of $ W $= 10, respectively. The black color means that the values are larger than 0.005.

    图 6  AB型堆垛有序-无序双层耦合正方晶格的带中态和带尾态波函数分布图 (a), (b)分别为层间弱耦合(U = 0.5)时弱无序(W = 1)及强无序(W = 12)体系中带中态(E = 0.34, 0.89)及带尾态(E = 6.07, 13.50)波函数的分布; (c), (d) 分别为层间强耦合(U = 4)时弱无序(W = 1)及强无序(W = 12)体系中带中态(E = –1.98, –0.67)及带尾态(E = 20.01, 23.05)波函数的分布; 黑色表示概率大于 0.005

    Fig. 6.  Eigen-wavefunctions of the eigen-states in the spectral central and tail regions for the order-disorder bilayer couplingsystem of square lattices with AB stacking: (a), (b) Eigen-wavefunctions of the eigen-states (E = 0.34, 0.89) in the spectral central region and the eigen-states (E = 6.07, 13.50) in the tail region for the weak coupling system of $ U $= 0.5 with small disorder of $ W $ = 1 and strong disorder of $ W $= 12, respectively; (c), (d) the eigen-wavefunctions of the eigen-states (E = –1.98, –0.67) in the spectral central region and the eigen-states (E = 20.01, 23.05) in tail region for the strong coupling system of $ U $ = 4 with small disorder of $ W $ = 1 and strong disorder of $ W $= 12, respectively. The black color means that the values are larger than 0.005.

    图 7  AA型堆垛有序-无序双层耦合正方晶格波函数的格点占据数$ P\left(E\right) $$ W $的变化情况 (a) 弱耦合系统$ U $= 0.5; (b), (c) 强耦合系统$ U $= 4.0

    Fig. 7.  Variation of participation number $ P\left(E\right) $ with $ W $ for the order-disorder bilayer coupling system with AA stacking: (a) Weak coupling system of $ U $= 0.5; (b), (c) strong coupling system of $ U $= 4.0.

    图 8  AA型堆垛有序-无序双层耦合正方晶格的格点占据数$ P(E) $随体系尺寸大小N的变化 (a), (b) 弱耦合系统$ U $= 0.5;(c), (d) 强耦合系统$ U $= 4.0.

    Fig. 8.  Variation of participation number P(E) with system size N for order-disorder bilayer coupling system with AA stacking. (a), (b) Weak coupling system of $ U $= 0.5; (c), (d) strong coupling system of $ U $= 4.0

    图 9  (a)—(d) AA型堆垛有序-无序双层耦合正方晶格系统的带尾态和带中态中典型能量处的P(E)随N的变化, 符号对应计算结果, 虚线为对${\text{log}}P\sim \gamma {\text{log}}N$的拟合线; (e), (f) 拟合指数$ \gamma $随能量的分布

    Fig. 9.  (a)–(d) Variation of P(E) with N for the order-disorder bilayer coupling system with AA stacking at typical energy values in the spectral tail and central regions, where symbols are the calculation results, dashed lines are the fitting results to $ \text{log}P\sim \gamma \text{log}N $; (e), (f) distribution of fitting exponent $ \gamma $ with energy.

    图 10  (a)—(d) AB型堆垛有序-无序双层耦合正方晶格的带尾态和带中态中典型能量处的$ P\left(E\right) $N的变化, 符号对应计算结果, 虚线为对$ {\rm{log}}P \sim \gamma{ \rm{log}}N $的线性拟合线; (e), (f) 拟合指数$ \gamma $随能量的分布

    Fig. 10.  (a)–(d) Variation of P(E) with N for the order-disorder bilayer coupling system with AB stacking at typical energy values in the spectral tail and central regions, where symbols are the calculation results, dashed lines are the fitting results to ${ \rm{log}}P \sim $$ \gamma {\rm{log}}N$; (e), (f) distribution of fitting exponent $ \gamma $ with energy.

    图 11  AA堆垛有序-无序双层耦合正方晶格中量子扩散的均方位移$ d\left(t\right) $(符号)及对$ d\left(t\right)\sim{t}^{b} $的拟合结果(虚线) (a) 弱耦合系统$ U $= 0.5; (b) 强耦合系统$ U $= 4; (c) 拟合指数b随无序度$ W $的变化

    Fig. 11.  Mean-square displacement $ d\left(t\right) $ (symbols) of the quantum diffusion for the order-disorder bilayer coupling system of the square lattices with AA stacking and theirfitting results to $ d\left(t\right)\sim{t}^{b} $ (dash line): (a) Weak coupling system of U = 0.5; (b) strong coupling system of U = 4; (c) variation of the fitting results of b with the degree of disorder W.

    图 12  AB堆垛有序-无序双层耦合正方晶格中量子扩散的均方位移$ d\left(t\right) $(符号)及对$d\left(t\right)\sim{t}^{b}$拟合结果(虚线) (a) 弱耦合系统$ U $= 1; (b) 强耦合系统$ U $= 4; (c) 拟合指数$ b $随无序度$ W $的变化

    Fig. 12.  Mean-square displacement d(t) (symbols) of the quantum diffusion for the order-disorder bilayer coupling system of the square lattices with AB stacking and their fitting results to $ d\left(t\right)\sim {t}^{b} $ (dash line): (a) Weak coupling system of $ U $= 1; (b) strong coupling system of $ U $= 4; (c) variation of the fitting results of b with the degree of disorder W.

    图 13  有序-无序双层六角晶格耦合体系模型图, 上层原子位于下层原子正上方

    Fig. 13.  Schematic illustration of the order-disorder coupling system of bilayer hexagonal lattices, the upper atom is directly above the lower atom.

    图 14  双层耦合六角周期晶格的能带与DOS (a) $ U $=1的能带图; (b) $ U $= 4的能带图; (c) DOS 随$ U $的变化

    Fig. 14.  Energy spectra and density of states for the periodic coupling system of bilayer hexagonal lattices: (a) Energy spectra with U = 1; (b) energy spectra with U = 4; (c) variation of DOS with U.

    图 15  有序-无序双层耦合六角晶格电子能谱 (a), (b) DOS随W的变化; (c), (d) DOS随U的变化

    Fig. 15.  Energy spectra for the order-disorder bilayer coupling system of bilayer hexagonal lattices: (a), (b) Changes of the DOS for different W; (c), (d) changes of the DOS for different U.

    图 16  有序-无序双层耦合六角晶格结构中对不同能量处${ \rm{l}\rm{o}\rm{g}}P\sim\gamma {\rm{l}\rm{o}\rm{g}}N$的拟合结果 (a) 弱耦合体系(U = 0.5)中不同W下拟合指数$ \gamma $随能量的分布; (b) 强耦合体系(U = 4.0)中不同W下拟合指数$ \gamma $随能量的分布

    Fig. 16.  Fitting results to ${\rm{l}\rm{o}\rm{g}}P\sim\gamma {\rm{l}\rm{o}\rm{g}}N$ for the order-disorder bilayer coupling system of bilayer hexagonal lattices at different energy: (a) Changes of the distribution of fitting exponent $ \gamma $ with energy for different W for weak coupling system of $ U $= 0.5; (b) changes of the distribution of fitting exponent $ \gamma $ with energy for different W for strong coupling system of $ U $= 4.0.

    图 17  有序-无序双层耦合六角晶格结构中对$ d\left(t\right) \sim {t}^{b} $的拟合参数$ b $随无序度$ W $的变化情况

    Fig. 17.  Variation of the fitting parameter of b of the fitting function $ d\left(t\right)\sim{t}^{b} $ with the degree of disorder $ W $ for the order-disorder bilayer coupling system of bilayer hexagonal lattices.

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    Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y, Dubonos S V, Grigorieva I V, Firsov A A 2004 Science 306 666Google Scholar

    [2]

    Novoselov K S, Jiang D, Schedin F, Booth T J, Khotkevich V V, Morozov S V, Geim A K 2005 Proc. Natl. Acad. Sci. USA 102 10451Google Scholar

    [3]

    Geim A K, Grigorieva I V 2013 Nature 499 419Google Scholar

    [4]

    Novoselov K S, Mishchenko A, Carvalho A, Neto A C 2016 Science 353 aac9439Google Scholar

    [5]

    Zhu Y, Ji H, Cheng H M, Ruoff R S 2018 Natl. Sci. Rev. 5 90Google Scholar

    [6]

    Bian R, Li C, Liu Q, Cao G, Fu Q, Meng P, Zhou J, Liu F, Liu Z 2021 Natl. Sci. Rev. 0 nwab164Google Scholar

    [7]

    Cao Y, Fa Temi V, Fa Ng S, Watanabe K, Taniguchi T, Kaxiras E, Jarillo-Herrero P 2018 Nature 556 43Google Scholar

    [8]

    Lu X, Stepanov P, Yang W, Xie M, Efetov D K 2019 Nature 574 653Google Scholar

    [9]

    吕新宇, 李志强 2019 物理学报 68 220303Google Scholar

    Lü X Y, Li Z Q 2019 Acta Phys. Sin. 68 220303Google Scholar

    [10]

    Nimbalkar A, Kim H 2020 Nano-Micro Lett. 12 20Google Scholar

    [11]

    何龙, 宋筠 2013 物理学报 62 057303Google Scholar

    He L, Song Y 2013 Acta Phys. Sin. 62 057303Google Scholar

    [12]

    Rozhkov A V, Sboychakov A O, Rakhmanov A L, Nori F 2016 Phys. Rep. 648 1Google Scholar

    [13]

    Conte F, Ninno D, Cantele G 2019 Phys. Rev. B 99 155429Google Scholar

    [14]

    Anderson P W 1958 Phys. Rev. 109 1492Google Scholar

    [15]

    Abrahams E A, Anderson P, Licciardello D, Ramakrishnan T 1979 Phys. Rev. Lett. 42 673Google Scholar

    [16]

    Addou R, Colombo L, Wallace R M 2015 ACS Appl. Mater Interf. 7 11921Google Scholar

    [17]

    Fernández-Serra M, Adessi C, Blase X 2006 Phys. Rev. Lett. 96 166805Google Scholar

    [18]

    Yang K W, Chen X Y, Zheng Z H, Wan J Q, Feng M, Yu Y 2019 J. Mater. Chem. A 7 3863Google Scholar

    [19]

    Xu D, Liu H, Iv V S, Song J, Jiang H, Sun Q F, Xie X C 2013 J. Phys. Condens Matter 25 105303Google Scholar

    [20]

    Bagci V, Krokhin A A 2007 Phys. Rev. B 76 134202Google Scholar

    [21]

    Zhang W, Yang R, Ulloa S E 2009 Phys. Rev. E 80 051901Google Scholar

    [22]

    Markussen T, Rurali R, Brandbyge M, Jauho A P 2006 Phys. Rev. B 74 245313Google Scholar

    [23]

    Akguc G B, Gong J 2009 Phys. Rev. B 81 117402Google Scholar

    [24]

    Menezes M G, Nero J D, Capaz R B, Rego L 2010 Phys. Rev. B 81 117401Google Scholar

    [25]

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出版历程
  • 收稿日期:  2022-05-27
  • 修回日期:  2022-08-26
  • 上网日期:  2022-12-10
  • 刊出日期:  2022-12-24

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