Controlling collision properties of solitons in five-level M-type triple quantum dot electromagnetically induced transparency medium by inter-dot tunneling coupling

Yang Xuan; Wang Yin; Wang Deng-Long; Ding Jian-Wen

doi:10.7498/aps.69.20200141

Abstract

Experimentally, the triple-quantum-dots system can be produced on a GaAs $ \left[ {001} \right]$ substrate by molecular beam epitaxy or in-situ atomic layer precise etching, thus enabling a triangle triple quantum dot (QD) aligned along the $ \left[ {1\bar 10} \right]$ direction. According to this, we first propose a five-level M-type triple QD electromagnetically induced transparency (EIT) model which consists of a triple QD molecule interacting with a weakly linearly polarized probe field with two orthogonal polarization components under the action of a magnetic field parallel to the light propagation direction. Subsequently, by using the multiple-scale method combined with the Fourier integration method, the propagation characteristics of the optical solitons and the collision characteristics of two solitons in the system are studied. It is shown that the optical solitons can form and propagate stably in this system under the action of quantum inter-dot tunneling coupling whose formation mechanism is different from the soliton-forming mechanism in ultra-cold atomic, single QD, and double QD EIT system. This is because the necessary condition for forming a soliton is to use a strong light beam to modulate a weak light beam, whether it is in an ultra-cold atom system, or a single quantum dot EIT medium or a double quantum dot EIT medium. In a word, the formation of soliton in previous EIT systems needs an additional strong controlling field, while the five-level M-type triple QD EIT system is dependent on the inter-dot tunneling.Since the solitons can propagate stably, the collision properties of the solitons may be studied in this system. Finally, by applying Fourier integration method, it is found that the collision behaviors of two solitons are determined by their initial phase difference. When their initial phase difference is 0, the collision behavior between the solitons is periodic elastic collision. While their initial phase difference is separately $ {\rm{\pi }}/4$, $ \text{π}/2$, and $ \text{π}$, the collision behaviors exhibit separation phenomenon due to repulsive effect. Interestingly, the collision characteristics of two solitons are controlled by the inter-dot tunneling strength. With the increase of inter-dot tunneling strength, the collision period of two solitons with the initial phase difference of 0 decreases, and the repulsive force of two solitons with the initial phase difference being separately π/4, π/2 and π increases. This provides some theoretical basis for experimentally controlling the soliton dynamical properties in semiconductor quantum dot devices.

Keywords:

inter-dot tunneling coupling /
solition collision behaviors /
phase difference /
electromagnetically induced transparency medium

Authors and contacts

School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China

Corresponding author: Wang Deng-Long, dlwang@xtu.edu.cn

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References

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[47]	Si L G, Yang W X, Lü X Y, Li J H, Yang X X 2009 Eur. Phys. J. D 55 161 Google Scholar

Cited By

图 1 五能级M型三量子点电磁感应透明介质能级结构图. $ \left| 0 \right\rangle $表示基态, $ \left| 1 \right\rangle $和$ \left| 2 \right\rangle $表示直接激子态, $ \left| 3 \right\rangle $和$ \left| 4 \right\rangle $是间接激子态, $ T{e_1}$和$ T{e_2}$分别表示中间量子点与左、右量子点间的点间隧穿耦合强度

Figure 1. Energy level structure diagram of a five-level M-type three-quantum-dot electromagnetically induced transparent medium. Here $ \left| 0 \right\rangle $ is the ground state, $ \left| 1 \right\rangle $ and $ \left| 2 \right\rangle $ are the direct exciton state, $ \left| 3 \right\rangle $ and $ \left| 4 \right\rangle $ represent the indirect exciton state, and $ T{e_1}$ and $ T{e_2}$ represent the strength of tunneling coupling between the intermediate quantum dot and the left and right quantum dot, respectively.

DownLoad: Full-Size Img PowerPoint

图 2 (a) 色散系数和 (b) 非线性系数的虚部与实部的比值随量子点间隧穿强度的变化关系. 图中所选参数已在正文中给出

Figure 2. The ratio of the imaginary part to the real part of (a) dispersion coefficient and (b) nonlinear coefficient as a function of tunneling strength of the quantum inter-dot. The parameters used are given in the text.

DownLoad: Full-Size Img PowerPoint

图 3 不同时刻线性探测光的两偏振分量(a) $ {\left| {{\varOmega _{{\rm{p}}1}}/{U_0}} \right|^2}$和(b)$ {\left| {{\varOmega _{{\rm{p}}2}}/{U_0}} \right|^2}$的传播情况, 图中所用参数为$ {C_1} = 1$, $ T{e_1} = T{e_2} = 2.16\;{\rm{meV}}$, 其他的参数已在文中给出

Figure 3. The propagation behaviors of two polarized components (a) $ {\left| {{\varOmega _{{\rm{p}}1}}/{U_0}} \right|^2}$ and (b) $ {\left| {{\varOmega _{{\rm{p}}2}}/{U_0}} \right|^2}$ of the linear probe field under the different time. The parameters used are $ {C_1} = 1$, $ T{e_1} = T{e_2} = 2.16\;{\rm{meV}}$. Other parameters used are given in the text.

DownLoad: Full-Size Img PowerPoint

图 4 当两点间隧穿强度均为2.16 meV时, 孤子对在不同初相位差时的碰撞行为　(a) $ {\theta _1} = 0$; (b) $ {\theta _1} = {{\text{π}} / 4}$; (c) $ {\theta _1} = {{\text{π}} / 2}$; (d) $ {\theta _1} = {{\text{π}} }$

Figure 4. The collision behaviors of two solitons with the different initial phase differences under the condition that both tunneling strengths are 2.16 meV: (a) $ {\theta _1} = 0$; (b) $ {\theta _1} = {{\text{π}} / 4}$; (c) $ {\theta _1} = {{\text{π}} / 2}$; (d) $ {\theta _1} = {{\text{π}} }$.

DownLoad: Full-Size Img PowerPoint

图 5 左旋偏振光的振幅随着点间隧穿强度变化关系. 图中所用各参数已在文中给出

Figure 5. The amplitude of the left-handed polarized light as a function of the tunneling strength of the inter-dot. The parameters used are given in the text.

DownLoad: Full-Size Img PowerPoint

图 6 当隧穿强度为4.32 meV时, 孤子对在不同初相位差时的碰撞行为　(a) $ {\theta _1} = 0$; (b) $ {\theta _1} = {{\text{π}} / 4}$; (c) $ {\theta _1} = {{\text{π}} / 2}$; (d) $ {\theta _1} = {{\text{π}} }$

Figure 6. When the tunneling strength is 4.32 meV, the collision behaviors of two solitons with the different initial phase: (a) $ {\theta _1} = 0$; (b) $ {\theta _1} = {{\text{π}} / 4}$; (c) $ {\theta _1} = {{\text{π}} / 2}$; (d) $ {\theta _1} = {{\text{π}} }$.

DownLoad: Full-Size Img PowerPoint

map

[1]	Scott A C, Chu F Y F, McLaughlin D W 1973 P IEEE 61 1443 Google Scholar
[2]	Dudley J M, Taylor J R 2009 Nat. Photonics 3 85 Google Scholar
[3]	Song W W, Li Q Y, Li Z D, Fu G S 2010 Chin. Phys. B 19 070503 Google Scholar
[4]	Wang Q, Wen L, Li Z D 2012 Chin. Phys. B 21 080501 Google Scholar
[5]	Li Z D, Wang Y Y, He P B 2019 Chin. Phys. B 28 010504 Google Scholar
[6]	Mollenauer L F, Stolen R H, Gordon J P 1980 Phys. Rev. Lett. 45 1095 Google Scholar
[7]	Haus H A, Wong W S 1996 Rev. Mod. Phys. 68 423 Google Scholar
[8]	Essiambre R J, Agrawal G P 1996 Opt. Lett. 21 116 Google Scholar
[9]	Xie C, Karlsson M, Andrekson P A, Sunnerud H, Li J 2002 IEEE J. Sel. Top. Quantum Electron. 8 575 Google Scholar
[10]	Badraoui N, Berceli T, Singh S 2017 19th International Conference on Transparent Optical Networks (ICTON) Girona, Spain, July 2–6, 2017 p1
[11]	Li Z D, He P B, Li L, Liang J Q, Liu W M 2005 Phys. Rev. A 71 053611 Google Scholar
[12]	Li L, Li Z D, Malomed B A, Mihalache D, Liu W M 2005 Phys. Rev. A 72 033611 Google Scholar
[13]	Zhang X F, Yang Q, Zhang J F, Chen X Z, Liu W M 2008 Phys. Rev. A 77 023613 Google Scholar
[14]	Zhang X F, Zhang P, He W Q, Lin X X 2011 Chin. Phys. B 20 020307 Google Scholar
[15]	Yao S F, Li Q Y, Li Z D 2011 Chin. Phys. B 20 110307 Google Scholar
[16]	Harris S E, Field J E, Imamoğlu A 1990 Phys. Rev. Lett. 64 1107 Google Scholar
[17]	Harris S E 1997 Phys. Today 50 36 Google Scholar
[18]	Kang H, Zhu Y 2003 Phys. Rev. Lett. 91 093601 Google Scholar
[19]	Kasapi A, Jain M, Yin G Y 1995 Phys. Rev. Lett. 74 2447 Google Scholar
[20]	Hau L V, Harris S E, Zachary D, Cyrus H B 1999 Nature 397 594 Google Scholar
[21]	唐宏, 王登龙, 张蔚曦, 丁建文, 肖思国 2017 66 034202 Google Scholar Tang H, Wang D L, Zhang W X, Ding J W, Xiao S G 2017 Acta. Phys. Sin. 66 034202 Google Scholar
[22]	Wu Y, Deng L 2004 Opt. Lett. 29 2064 Google Scholar
[23]	Wu Y, Deng L 2004 Phys. Rev. Lett. 93 143904 Google Scholar
[24]	Huang G X, Hang C, Deng L 2008 Phys. Rev. A 77 011803 Google Scholar
[25]	Kumar V R, Radha R, Wadati M 2008 Phys. Rev. A 78 041803 Google Scholar
[26]	Chen Y, Bai Z, Huang G X 2014 Phys. Rev. A 89 023835 Google Scholar
[27]	Gammon D, Snow E S, Shanabrook B V, Katzer D S, Park D, 1996 Science 273 87 Google Scholar
[28]	Borr P, Langbein W, Schneider S, Woggon U, Sellin R L, Ouyang D, Bimberg D 2001 Phys. Rev. Lett. 87 157401 Google Scholar
[29]	Guo R H, Shi H Y, Sun X D 2005 Photonics Asia 2004; Optoelectronics, Microelectronics, and Nanotech Beijing, China, November 8–11, 2004 p313
[30]	Borges H S, Sanz L, Villas-Bôas J M, Alcalde A M 2010 Phys. Rev. B 81 075322 Google Scholar
[31]	Högele A, Seidl S, Kroner M, Karrai K, Warburton R J, Gerardot B D, Petroff P M 2004 Phys. Rev. Lett. 93 217401 Google Scholar
[32]	Yang W X, Chen A X, Lee R K, Wu Y 2011 Phys. Rev. A 84 013835 Google Scholar
[33]	Kuo D M T, Guo G Y, Chang Y C 2001 Appl. Phys. Lett. 79 3851 Google Scholar
[34]	Kouklin N, Menon L, Bandyopadhyay S 2002 Appl. Phys. Lett. 80 1649 Google Scholar
[35]	Borges H S, Sanz L, Villas-Bôas J M, Diniz Neto O O, Alcalde A M 2012 Phys. Rev. B 85 115425 Google Scholar
[36]	Yuan C H, Zhu K D 2006 Appl. Phys. Lett. 89 052115 Google Scholar
[37]	She Y C, Zheng X J, Wang D L, Zhang W X 2013 Opt. Express 21 17392 Google Scholar
[38]	Tian S C, Wan R G, Tong C Z, Fu X H, Cao J S, Ning Y Q 2015 Laser Phys. Lett. 12 125203 Google Scholar
[39]	Wang J Y, Huang S, Huang G Y, Pan D, Zhao J, Xu H Q 2017 Nano Lett. 17 4158 Google Scholar
[40]	Grove-Rasmussen K, Jørgensen H I, Hayashi T, Lindelof P E, Fujisawa T 2008 Nano Lett. 8 1055 Google Scholar
[41]	Saraga D S, Loss D 2003 Phys. Rev. Lett. 90 166803 Google Scholar
[42]	Fafard S, Spanner M, McCaffrey J P, Wasilewski Z R 2000 Appl. Phys. Lett. 76 2268 Google Scholar
[43]	Beirne G J, Hermannstädter C, Wang L, Rastelli A, Schmidt O G, Michler P 2006 Phys. Rev. Lett. 96 137401 Google Scholar
[44]	Krause B, Metzger T H, Rastelli A, Songmuang R, Kiravittaya S, Schmidt O G 2005 Phys. Rev. B 72 085339 Google Scholar
[45]	Hang C, Huang G X 2008 Phys. Rev. A 77 033830 Google Scholar
[46]	佘艳超, 张蔚曦, 王登龙 2011 60 064205 Google Scholar She Y C, Zhang W X, Wang D L 2011 Acta. Phys. Sin. 60 064205 Google Scholar
[47]	Si L G, Yang W X, Lü X Y, Li J H, Yang X X 2009 Eur. Phys. J. D 55 161 Google Scholar

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