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An asymmetric graphene-coated elliptical dielectric nano-parallel wires’ waveguide is proposed. By using the multipole method, in the two elliptic cylindrical coordinate systems, firstly, the longitudinal component of the electric field and the magnetic field are expressed by Mathieu functions, then the corresponding angular and radial components are obtained by Maxwell’s equations. The graphene is regarded as a zero-thickness interface with surface conductivity, and the boundary conditions are applied to these interfaces by the point-matching method. A linear algebraic equation system is obtained finally. The effective refractive indices and the field distributions of modes can be obtained by numerically solving the equation. The six lowest order modes supported by the proposed structure are classified, and the dependence of the characteristics of these modes, separately, on the working wavelength, the graphene Fermi energy and waveguide structure parameters are studied. The real part of the effective refractive index, the propagating length, and the quality factor are used to judge the performance of the waveguide. The results reveal that the characteristics of these modes can be greatly changed by altering the working wavelength of the waveguide, the Fermi energy of graphene, and the spacing between nanowires. When the length of the semi-major and the semi-minor axes of the nanowires are modified, the real part of the effective refractive index, the propagating length, and the quality factor can only be changed finely. At the same time, the results obtained by the multipole method are completely consistent with the results from the finite element method. By comparing the performances among the fundamental mode supported by the single graphene-coated elliptical dielectric nanowire, the symmetric graphene-coated elliptical dielectric nano-parallel wires, and the asymmetric graphene-coated elliptical dielectric nano-parallel wires by the means of the FEM based on commercial software (COMSOL), we find that the performances of the proposed waveguide in this paper are superior to those of the other two waveguides. This work can provide a theoretical basis for the design, fabrication, and application of asymmetric graphene-coated elliptical dielectric nano-parallel wires’ waveguide. The proposed structure is expected to be used in the mode conversion and coupling in the future devices.
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Keywords:
- graphene /
- nanowires /
- waveguides /
- multipole method
[1] Jablan M, Buljan H, Soljacic M 2009 Phys.Rev. B 80 245435Google Scholar
[2] Vakil A, Engheta N 2011 Science 332 1291Google Scholar
[3] Parvaei B, Saghai H R, Eldlio M 2018 Opt. Quantum Electron. 50 303Google Scholar
[4] Balci O, Polat E O, Kakenov N, Kocabas C 2015 Nat. Commun. 6 6628Google Scholar
[5] Cao M S, Wang X X, Zhang M, Cao W Q, Fang X Y, Yuan J 2020 Adv. Mater. 32 1907156Google Scholar
[6] Cao M S, Wang X X, Cao W Q, Fang X Y, Wen B, Yuan J 2018 Small 14 1800987Google Scholar
[7] Wen B, Cao M S, Lu M M, Cao W Q, Shi H L, Liu J, Wang X X, Jin H B, Fang X Y, Wang W Z, Yuan J 2014 Adv. Mater. 26 3484Google Scholar
[8] He X Q, Ning T G, Pei L, Zheng J J, Li J, Wen X D 2019 Opt. Express 27 5961Google Scholar
[9] Jia Y H, Gong P, Li S L, Ma W D, Fang X Y, Yang Y Y, Cao M S 2020 Phys. Lett. A 384 126106Google Scholar
[10] Fang X Y, Yu X X, Zheng H M, Jin H B, Wang L, Cao M S 2015 Phys. Lett. A 379 2245Google Scholar
[11] Barnes W L, Dereux A, Ebbesen T W 2003 Nature 424 824Google Scholar
[12] Dionne J A, Sweatlock L A, Atwater H A, Polman A 2005 Phys. Rev. B 72 075405Google Scholar
[13] Moreno E, Garcia-Vidal F J, Rodrigo S G, Martin-Moreno L, Bozhevolnyi S I 2006 Opt. Lett. 31 3447Google Scholar
[14] Chang D E, Sørensen A S, Hemmer P R, Lukin M D 2007 Phy. Rev. B 76 035420Google Scholar
[15] Dionne J A, Sweatlock L A, Atwater H A, Polman A 2006 Phy. Rev. B 73 035407Google Scholar
[16] Liu P H, Zhang X Z, Ma Z H, Cai W, Wang L, Xu J J 2013 Opt. Express 21 32432Google Scholar
[17] 彭艳玲, 薛文瑞, 卫壮志, 李昌勇 2018 光学学报 38 0223002Google Scholar
Peng Y L, Xue W R, Wei Z Z, Li C Y 2018 Acta Opt. Sin. 38 0223002Google Scholar
[18] Christensen J, Manjavacas A, Thongrattanasiri S, Koppens F H L, Abajo F J G D 2012 ACS Nano 6 431Google Scholar
[19] Bao Q L, Loh K P 2012 ACS Nano 6 3677Google Scholar
[20] Gao Y X, Ren G B, Zhu B F, Wang J, Jian S S 2014 Opt. Lett. 39 5909Google Scholar
[21] Gao Y X, Ren G B, Zhu B F, Liu H Q, Lian Y D, Jian S S 2014 Opt. Express 22 24322Google Scholar
[22] Liu J P, Zhai X, Wang L L, Li H J, Xie F, Lin Q 2016 Plasmonics 11 703Google Scholar
[23] Yang J F, Yang J J, Deng W, Mao F C, Huang M 2015 Opt. Express 23 32289Google Scholar
[24] Liu J P, Zhai X, Xie F, Wang L L, Xia S X, Li H J, Luo X, Shang X J 2017 J. Lightwave Technol. 35 1971Google Scholar
[25] Xing R, Jian S S 2017 IEEE Photonics Technol. Lett. 29 967Google Scholar
[26] Xing R, Jian S S 2017 IEEE Photonics Technol. Lett. 29 1643Google Scholar
[27] Huang Y X, Zhang L, Yin H, Zhang M, Su H, Li L I, Liang H W 2017 Opt. Lett. 42 2078Google Scholar
[28] Zhu B F, Ren G B, Yang Y, Gao Y X, Wu B L, Lian Y D, Wang J, Jian S S 2015 Plasmonics 10 839Google Scholar
[29] 卫壮志, 薛文瑞, 彭艳玲, 程鑫, 李昌勇 2018 67 108101Google Scholar
Wei Z Z, Xue W R, Peng Y L, Cheng X, Li C Y 2018 Acta Phys. Sin. 67 108101Google Scholar
[30] Xing R, Jian S S 2016 IEEE Photonics Technol. Lett. 28 2779Google Scholar
[31] 程鑫, 薛文瑞, 卫壮志, 董慧莹, 李昌勇 2019 68 058101Google Scholar
Cheng X, Xue W R, Wei Z Z, Dong H Y, Li C Y 2019 Acta Phys. Sin. 68 058101Google Scholar
[32] Cheng X, Xue W R, Wei Z Z, Dong H Y, Li C Y 2019 Opt. Commun. 452 467Google Scholar
[33] Wijngaard W 1973 J. Opt. Soc. Am. 63 944Google Scholar
[34] White T P, Kuhlmey B T, McPhedran R C, Maystre D, Renversez G, Sterke C M, Botten L C 2002 J. Opt. Soc. Am. B 19 2322Google Scholar
[35] 孙兵, 陈明阳, 周骏, 余学权, 张永康, 于荣金 2010 光学学报 30 59Google Scholar
Sun B, Chen M Y, Zhou J, Yu X Q, Zhang Y K, Yu R J 2010 Acta Opt. Sin. 30 59Google Scholar
[36] 孙兵 2013 博士学位论文 (镇江: 江苏大学)
Sun B 2013 Ph. D. Dissertation (Zhenjiang: Jiangsu University) (in Chinese)
[37] Nikitin A Y, Guinea F, Garcia-Vidal F J, Martin-Moreno L 2011 Phy. Rev. B 84 195446Google Scholar
[38] Erricolo D, Carluccio G 2013 ACM Trans. Math. Soft. 40 8
[39] Lee W M 2011 J. Sound Vib. 330 4915Google Scholar
[40] Lee W M 2014 Int. J. Mech. Sci. 78 203Google Scholar
[41] Teng D, Wang K, Li Z, Zhao Y Z 2019 Opt. Express 27 12458Google Scholar
[42] He X Q, Ning T G, Lu S H, Zheng J J, Li J, Li R J, Pei L 2018 Opt. Express 26 10109Google Scholar
[43] Ye S, Wang Z X, Sun C R, Dong C B, Wei B Z, Wu B L, Jian S S 2018 Opt. Express 26 23854Google Scholar
[44] Xue Y, Ye F, Mihalache D, Panoiu N, Chen X 2014 Laser Photonics Rev. 8 L52
[45] Ye F, Mihalache D, Hu B, Panoiu N 2011 Opt. Lett. 36 1179Google Scholar
[46] Ye F, Mihalache D, Hu B, Panoiu N C 2010 Phys. Rev. Lett. 104 106802Google Scholar
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图 2 在
${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,$\lambda = 7\;\text{μm}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 40\;{\rm{nm}}$ 条件下, 6个最低阶模式的模式合成图 (a)−(f)、电场的z分量分布图(g)−(l)和电场强度分布图(m)−(r)Figure 2.
${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,$\lambda = 7\;\text{μm}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ and$d = 40\;{\rm{nm}}$ , pattern composition diagram (a)−(f), the z-component of electric field${E_z}$ (g)−(l) and the electric field distribution$\left| E \right|$ for the six lowest order modes (m)−(r).图 3 当
${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 20\;{\rm{nm}}$ 时, (a)有效折射率${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度$L_{\rm{prop}}$ 、(c)品质因数FOM随工作波长$\lambda $ 变化关系图; (d)$\lambda = 6.2\; \text{μm}$ , (e)$\lambda = 7\;\text{μm}$ , (f)$\lambda = 7.8\; \text{μm}$ 时基模的电场强度变化图Figure 3. The dependence of (a) the effective refractive index
${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length$L_{\rm{prop}}$ , (c) the quality factor FOM for the six lowest order modes on the wavelength$\lambda $ at${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 20\;{\rm{nm}}$ . And the electric field distribution$\left| E \right|$ for (d)$\lambda = 6.2\; \text{μm}$ , (e)$\lambda = 7\;\text{μm}$ , (f)$\lambda = 7.8\; \text{μm}$ .图 4 当
$\lambda = 7\;{\text{μ}\rm{m}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 20\;{\rm{nm}}$ 时 (a)有效折射率${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度${L_{{\rm{prop}}}}$ 和(c)品质因数FOM随石墨烯费米能${E_{\rm{f}}}$ 变化关系图Figure 4. The dependence of (a) the effective refractive index
${\rm{Re}} ({n_{_{{\rm{eff}}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ and (c) the quality factor FOM for the six lowest order modes on the graphene Fermi levels${E_{\rm{f}}}$ at$\lambda = 7\;{\text{μ}\rm{m}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 20\;{\rm{nm}}$ .图 5 当
$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ (a)有效折射率${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b)传播长度${L_{{\rm{prop}}}}$ , (c)品质因数FOM随两纳米线间距d变化关系图; (d)$d = 15\;{\rm{nm}}$ , (e)$d = 35 \;{\rm{nm}}$ , (f)$d = 55 \;{\rm{nm}}$ 时基模的电场强度变化图Figure 5. The dependence of (a) the effective refractive index
${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ , (c) the quality factor FOM for the six lowest order modes on the distance d between two nanowires at$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ; the electric field distribution$\left| E \right|$ for (d)$d = 15\;{\rm{nm}}$ , (e)$d = 35 \;{\rm{nm}}$ , (f)$d = 55 \;{\rm{nm}}$ .图 6 当
$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 30\;{\rm{nm}}$ 时, (a)有效折射率实部${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度${L_{{\rm{prop}}}}$ 和(c)品质因数FOM随1号纳米线半长轴${a_1}$ 变化关系图Figure 6. When
$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 30\;{\rm{nm}}$ , the dependence of (a) the effective refractive index${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ , and (c) the quality factor FOM for the six lowest order modes on the length of${a_1}$ on the No.1 nanowire.图 7 当
$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 35\;{\rm{nm}}$ 时, (a)有效折射率实部${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度${L_{{\rm{prop}}}}$ 和(c)品质因数FOM随1号纳米线半短轴b1变化关系图Figure 7. When
$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 35\;{\rm{nm}}$ , the dependence of (a) the effective refractive index${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ and (c) the quality factor FOM for the six lowest order modes on the length of${b_1}$ on the No.1 nanowire.图 8 当
${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ 时, 三种波导结构所支持的基模的 (a)有效折射率${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度和${L_{{\rm{prop}}}}$ 和(c)品质因数FOM随波长$\lambda $ 变化的关系图Figure 8. When
${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ , the dependence of (a) the effective refractive index${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ and (c) the quality factor FOM of the fundamental mode supported by the three structures on the wavelength$\lambda $ .图 9 当
$\lambda = 7\;{\rm{\mu m}}$ 时, 三种波导结构所支持的基模的 (a)有效折射率${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度${L_{{\rm{prop}}}}$ 和(c)品质因数FOM随石墨烯的费米能级变化的关系图Figure 9. When
$\lambda = 7\;{\rm{\mu m}}$ , the dependence of (a) the effective refractive index${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ and (c) the quality factor FOM of the fundamental mode supported by the three structures on the Fermi levels. -
[1] Jablan M, Buljan H, Soljacic M 2009 Phys.Rev. B 80 245435Google Scholar
[2] Vakil A, Engheta N 2011 Science 332 1291Google Scholar
[3] Parvaei B, Saghai H R, Eldlio M 2018 Opt. Quantum Electron. 50 303Google Scholar
[4] Balci O, Polat E O, Kakenov N, Kocabas C 2015 Nat. Commun. 6 6628Google Scholar
[5] Cao M S, Wang X X, Zhang M, Cao W Q, Fang X Y, Yuan J 2020 Adv. Mater. 32 1907156Google Scholar
[6] Cao M S, Wang X X, Cao W Q, Fang X Y, Wen B, Yuan J 2018 Small 14 1800987Google Scholar
[7] Wen B, Cao M S, Lu M M, Cao W Q, Shi H L, Liu J, Wang X X, Jin H B, Fang X Y, Wang W Z, Yuan J 2014 Adv. Mater. 26 3484Google Scholar
[8] He X Q, Ning T G, Pei L, Zheng J J, Li J, Wen X D 2019 Opt. Express 27 5961Google Scholar
[9] Jia Y H, Gong P, Li S L, Ma W D, Fang X Y, Yang Y Y, Cao M S 2020 Phys. Lett. A 384 126106Google Scholar
[10] Fang X Y, Yu X X, Zheng H M, Jin H B, Wang L, Cao M S 2015 Phys. Lett. A 379 2245Google Scholar
[11] Barnes W L, Dereux A, Ebbesen T W 2003 Nature 424 824Google Scholar
[12] Dionne J A, Sweatlock L A, Atwater H A, Polman A 2005 Phys. Rev. B 72 075405Google Scholar
[13] Moreno E, Garcia-Vidal F J, Rodrigo S G, Martin-Moreno L, Bozhevolnyi S I 2006 Opt. Lett. 31 3447Google Scholar
[14] Chang D E, Sørensen A S, Hemmer P R, Lukin M D 2007 Phy. Rev. B 76 035420Google Scholar
[15] Dionne J A, Sweatlock L A, Atwater H A, Polman A 2006 Phy. Rev. B 73 035407Google Scholar
[16] Liu P H, Zhang X Z, Ma Z H, Cai W, Wang L, Xu J J 2013 Opt. Express 21 32432Google Scholar
[17] 彭艳玲, 薛文瑞, 卫壮志, 李昌勇 2018 光学学报 38 0223002Google Scholar
Peng Y L, Xue W R, Wei Z Z, Li C Y 2018 Acta Opt. Sin. 38 0223002Google Scholar
[18] Christensen J, Manjavacas A, Thongrattanasiri S, Koppens F H L, Abajo F J G D 2012 ACS Nano 6 431Google Scholar
[19] Bao Q L, Loh K P 2012 ACS Nano 6 3677Google Scholar
[20] Gao Y X, Ren G B, Zhu B F, Wang J, Jian S S 2014 Opt. Lett. 39 5909Google Scholar
[21] Gao Y X, Ren G B, Zhu B F, Liu H Q, Lian Y D, Jian S S 2014 Opt. Express 22 24322Google Scholar
[22] Liu J P, Zhai X, Wang L L, Li H J, Xie F, Lin Q 2016 Plasmonics 11 703Google Scholar
[23] Yang J F, Yang J J, Deng W, Mao F C, Huang M 2015 Opt. Express 23 32289Google Scholar
[24] Liu J P, Zhai X, Xie F, Wang L L, Xia S X, Li H J, Luo X, Shang X J 2017 J. Lightwave Technol. 35 1971Google Scholar
[25] Xing R, Jian S S 2017 IEEE Photonics Technol. Lett. 29 967Google Scholar
[26] Xing R, Jian S S 2017 IEEE Photonics Technol. Lett. 29 1643Google Scholar
[27] Huang Y X, Zhang L, Yin H, Zhang M, Su H, Li L I, Liang H W 2017 Opt. Lett. 42 2078Google Scholar
[28] Zhu B F, Ren G B, Yang Y, Gao Y X, Wu B L, Lian Y D, Wang J, Jian S S 2015 Plasmonics 10 839Google Scholar
[29] 卫壮志, 薛文瑞, 彭艳玲, 程鑫, 李昌勇 2018 67 108101Google Scholar
Wei Z Z, Xue W R, Peng Y L, Cheng X, Li C Y 2018 Acta Phys. Sin. 67 108101Google Scholar
[30] Xing R, Jian S S 2016 IEEE Photonics Technol. Lett. 28 2779Google Scholar
[31] 程鑫, 薛文瑞, 卫壮志, 董慧莹, 李昌勇 2019 68 058101Google Scholar
Cheng X, Xue W R, Wei Z Z, Dong H Y, Li C Y 2019 Acta Phys. Sin. 68 058101Google Scholar
[32] Cheng X, Xue W R, Wei Z Z, Dong H Y, Li C Y 2019 Opt. Commun. 452 467Google Scholar
[33] Wijngaard W 1973 J. Opt. Soc. Am. 63 944Google Scholar
[34] White T P, Kuhlmey B T, McPhedran R C, Maystre D, Renversez G, Sterke C M, Botten L C 2002 J. Opt. Soc. Am. B 19 2322Google Scholar
[35] 孙兵, 陈明阳, 周骏, 余学权, 张永康, 于荣金 2010 光学学报 30 59Google Scholar
Sun B, Chen M Y, Zhou J, Yu X Q, Zhang Y K, Yu R J 2010 Acta Opt. Sin. 30 59Google Scholar
[36] 孙兵 2013 博士学位论文 (镇江: 江苏大学)
Sun B 2013 Ph. D. Dissertation (Zhenjiang: Jiangsu University) (in Chinese)
[37] Nikitin A Y, Guinea F, Garcia-Vidal F J, Martin-Moreno L 2011 Phy. Rev. B 84 195446Google Scholar
[38] Erricolo D, Carluccio G 2013 ACM Trans. Math. Soft. 40 8
[39] Lee W M 2011 J. Sound Vib. 330 4915Google Scholar
[40] Lee W M 2014 Int. J. Mech. Sci. 78 203Google Scholar
[41] Teng D, Wang K, Li Z, Zhao Y Z 2019 Opt. Express 27 12458Google Scholar
[42] He X Q, Ning T G, Lu S H, Zheng J J, Li J, Li R J, Pei L 2018 Opt. Express 26 10109Google Scholar
[43] Ye S, Wang Z X, Sun C R, Dong C B, Wei B Z, Wu B L, Jian S S 2018 Opt. Express 26 23854Google Scholar
[44] Xue Y, Ye F, Mihalache D, Panoiu N, Chen X 2014 Laser Photonics Rev. 8 L52
[45] Ye F, Mihalache D, Hu B, Panoiu N 2011 Opt. Lett. 36 1179Google Scholar
[46] Ye F, Mihalache D, Hu B, Panoiu N C 2010 Phys. Rev. Lett. 104 106802Google Scholar
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