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环状暗孤子最早是在非线性光学系统中理论预言并实验实现的一种二维孤子类型. 跟通常的二维孤子(如条纹孤子)相比, 环状暗孤子具有更好的稳定性和更加丰富的动力学行为. 玻色-爱因斯坦凝聚由于其高度可调控性为研究环状暗孤子提供了一个全新的平台. 本文结合玻色-爱因斯坦凝聚和孤子研究的现状, 综述玻色-爱因斯坦凝聚中环状暗孤子的解析解、稳定性调控及其衰变动力学等方面的研究进展. 首先介绍了一套变换方法将均匀系统中非线性系数不随时间变化的环状暗孤子解析解推广到谐振子外势下非线性系数随时间变化的环状暗孤子解析解; 然后讨论在形变扰动下环状暗孤子的稳定性相图, 并介绍了如何利用周期调制的非线性来增强环状暗孤子的稳定性; 此外, 还重点讨论了环状暗孤子衰变导致的涡旋极子动力学以及斑图形成.Soliton is an exotic topological excitation, and it widely exists in various nonlinear systems, such as nonlinear optics, Bose-Einstein condensates, classical and quantum fluids, plasma, magnetic materials, etc. A stable soliton can propagate with constant amplitude and velocity, and maintain its shape. Two-dimensional and three-dimensional solitons are usually hard to stabilize, and how to realize stable two-dimensional or three-dimensional solitons has aroused the great interest of the researchers. Ring dark soliton is a kind of two-dimensional soliton, which was first theoretically predicted and experimentally realized in nonlinear optical systems. Compared with the usual two-dimensional solitons, ring dark solitons have good stability and rich dynamical behaviors. Owing to their highly controllable capability, Bose-Einstein condensates provide a new platform for studying the ring dark solitons. Based on the recent progress in Bose-Einstein condensates and solitons, this paper reviews the research on the analytic solutions, stability, as well as the decay dynamics of ring dark solitons in Bose-Einstein condensates. A transform method is introduced, which generalizes the analytic solutions of ring dark solitons from a homogeneous system with time-independent nonlinearity to a harmonically trapped inhomogeneous system with time-dependent nonlinearity. The stability phase diagram of the ring dark soliton under deformation perturbations is discussed by numerically solving the Gross-Pitaevskii equations in the mean-field theory. A method of enhancing the stability of ring dark solitons by periodically modulating the nonlinear coefficients is introduced. It is also shown that the periodically modulated nonlinear coefficient can be experimentally realized by the Feshbach resonance technology. In addition, we discuss the dynamics of the decay of ring dark solitons. It is found that the ring dark soliton can decay into various vortex clusters composed of vortices and antivortices. This opens a new avenue to the investigation of vortex dynamics and quantum turbulence. It is also found that the ring dark solitons combined with periodic modulated nonlinearity can give rise to the pattern formation, which is an interesting nonlinear phenomenon widely explored in all the fields of nature. Finally, some possible research subjects about ring dark solitons in future research are also discussed.
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Keywords:
- Bose-Einstein condensation /
- ring dark soliton /
- vortex dipole /
- pattern formation
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图 1 形变扰动下环状暗孤子的稳定性相图[51]
Fig. 1. Stability phase diagram of ring dark solitons under deformation perturbation.
图 2 单分量BEC中形变扰动下环状暗孤子的衰变行为[51]
Fig. 2. Decay of the ring dark soliton under deformation perturbation in a single-component BEC.
图 3 两分量BEC中相同深度环状暗孤子的衰变行为[86]
Fig. 3. Decay of the ring dark solitons with the same depth in two-component BECs.
图 4 四组涡旋极子在两分量BEC中的动力学演化[86]
Fig. 4. Evolution of four vortex dipoles in two-component BECs.
图 5 两分量BEC中不同深度环状暗孤子的衰变行为[86]
Fig. 5. Decay of the ring dark solitons with different depths in two-component BECs.
图 6 周期调制相互作用系统中环状暗孤子衰变引起的斑图形成[94]
Fig. 6. Pattern formation induced by the decay of ring dark solitons in a system with periodically modulated interactions.
图 7 斑图在周期调制相互作用系统中的演化[94]
Fig. 7. Evolution of the pattern in a system with periodically modulated interactions.
表 1 环状暗孤子寿命随相互作用振荡频率的变化[51]
Table 1. Life of the ring dark soliton as a function of the interaction oscillation frequency.
相互作用振荡频率$\omega$/$\varOmega$ 环状暗孤子寿命t/ms $ < 0.5$ $ < 15$ 0.6 17 0.8 43 1.0 45 1.5 16 $ > 1.7$ $ < 15$ 注1: 原子间相互作用$g(t) = 1-\sin{\omega t}$, 环状暗孤子深度$\cos{\phi(0)} = 0.76$. -
[1] Zabusky N J, Kruskal M D 1965 Phys. Rev. Lett. 15 240
[2] Kartashov Y V, Malomed B A, Torner L 2011 Rev. Mod. Phys. 83 247Google Scholar
[3] Kivshar Y S, Malomed B A 1989 Rev. Mod. Phys. 61 763Google Scholar
[4] Fan S T, Zhang Y Y, Yan L L, Guo W G, Zhang S G, Jiang H F 2019 Chin. Phys. B 28 064204Google Scholar
[5] Zhao L C, Yang Z Y, Yang W L 2019 Chin. Phys. B 28 010501Google Scholar
[6] Shou Q, Liu D W, Zhang X, Hu W, Guo Q 2014 Chin. Phys. B 23 084204Google Scholar
[7] Lei Y, Lou S Y 2013 Chin. Phys. Lett. 30 060202Google Scholar
[8] Li Q Y, Zhao F, He P B, Li Z D 2015 Chin. Phys. B 24 037508Google Scholar
[9] Qi W, Li H F, Liang Z X 2019 Chin. Phys. Lett. 36 040501Google Scholar
[10] Lai X J, Cai X O, Zhang J F 2015 Chin. Phys. B 24 070503Google Scholar
[11] Anderson M H, Ensher J R, Matthews M R, Wieman C E, Cornell E A 1995 Science 269 198Google Scholar
[12] Davis K B, Mewes M O, Andrews M R, Druten N J, Durfee D S, Kurn D M, Ketterle W 1995 Phys. Rev. Lett. 75 3969Google Scholar
[13] Bradley C C, Sackett C A, Tollett J J, Hulet R G 1995 Phys. Rev. Lett. 75 1687Google Scholar
[14] Bradley C C, Sackett C A, Hulet R G 1997 Phys. Rev. Lett. 78 985Google Scholar
[15] Dalfovo F, Giorgini S, Pitaevskii L P, Stringari S 1999 Rev. Mod. Phys. 71 463Google Scholar
[16] Leggett A J 2001 Rev. Mod. Phys. 73 307Google Scholar
[17] Morsch O, Oberthaler M 2006 Rev. Mod. Phys. 78 179Google Scholar
[18] Fetter A L 2009 Rev. Mod. Phys. 81 647Google Scholar
[19] Chin C, Grimm R, Julienne P, Tiesinga E 2010 Rev. Mod. Phys. 82 1225Google Scholar
[20] Stamper-Kurn D M, Ueda M 2013 Rev. Mod. Phys. 85 1191Google Scholar
[21] Goldman N, Juzeliūnas G, Öhberg P, Spielman I B 2014 Rep. Prog. Phys. 77 126401Google Scholar
[22] Balakrishnan R, Satija I I 2011 Pramana J. Phys. 77 929Google Scholar
[23] Carretero-González R, Frantzeskakis D J, Kevrekidis P G 2008 Nonlinearity 21 R139Google Scholar
[24] Frantzeskakis D J 2010 J. Phys. A: Math. Theor. 43 213001Google Scholar
[25] Kevrekidis P G, Frantzeskakis D J, Carretero-González R 2008 Emergent Nonlinear Phenomena in Bose-Einstein Condensates: Theory and Experiment (Berlin: Springer Press)
[26] Ruprecht P A, Holland M J, Burnett K, Edwards M 1995 Phys. Rev. A 51 4704Google Scholar
[27] Denschlag J, Simsarian J E, Feder D L, Clark C W, Collins L A, Cubizolles J, Deng L, Hagley E W, Helmerson K, Reinhardt W P, Rolston S L, Schneider B I, Phillips W D 2000 Science 287 97Google Scholar
[28] Sanpera A, Shlyapnikov G V, Lewenstein M 1999 Phys. Rev. Lett. 83 5198Google Scholar
[29] Tiesinga E, Verhaar B J, Stoof H T C 1993 Phys. Rev. A 47 4114Google Scholar
[30] Inouye S, Andrews M R, Stenger J, Miesner H J, Stamper-Kurn D M, Ketterle W 1998 Nature 392 151Google Scholar
[31] Strecker K E, Partridge G B, Truscott A G, Hulet R G 2002 Nature 417 150Google Scholar
[32] Khaykovich L, Schreck F, Ferrari G, Bourdel T, Cubizolles J, Carr L D, Castin Y, Salomon C 2002 Science 296 1290Google Scholar
[33] Cornish S L, Thompson S T, Wieman C E 2006 Phys. Rev. Lett. 96 170401Google Scholar
[34] Malomed B A 2016 Eur. Phys. J. Special Topics 225 2507Google Scholar
[35] Kivshar Y S, Luther-Davies B 1998 Phys. Rep. 298 81Google Scholar
[36] Reinhardt W P, Clark C W 1997 J. Phys. B: At. Mol. Opt. Phys. 30 L785Google Scholar
[37] Feder D L, Pindzola M S, Collins L A, Schneider B I, Clark C W 2000 Phys. Rev. A 62 053606Google Scholar
[38] Brand J, Reinhardt W P 2002 Phys. Rev. A 65 043612Google Scholar
[39] Huang G, Makarov V A, Velarde M G 2003 Phys. Rev. A 67 023604Google Scholar
[40] Dutton Z, Budde M, Slowe C, Hau L V 2001 Science 293 663Google Scholar
[41] Anderson B P, Haljan P C, Regal C A, Feder D L, Collins L A, Clark C W, Cornell E A 2001 Phys. Rev. Lett. 86 2926Google Scholar
[42] Tikhonenko V, Christou J, Luther-Davies B, Kivshar Y S 1996 Opt. Lett. 21 1129Google Scholar
[43] Kuznetsov E, Turitsyn S 1998 Zh. Eksp. Teor. Fiz. 94 119
[44] Theocharis G, Frantzeskakis D J, Kevrekidis P G, Malomed B A, Kivshar Y S 2003 Phys. Rev. Lett. 90 120403Google Scholar
[45] Kivshar Y S, Yang X 1994 Phys. Rev. E 50 R40Google Scholar
[46] Kivshar Y S, Yang X 1994 Chaos, Solitons Fractals 4 1745Google Scholar
[47] Baluschev S, Dreischuh A, Velchev I, Dinev S, Marazov O 1995 Appl. Phys. B: Lasers Opt. 61 121Google Scholar
[48] Baluschev S, Dreischuh A, Velchev I, Dinev S, Marazov O 1995 Phys. Rev. E 52 5517Google Scholar
[49] Yang S J, Wu Q S, Zhang S N, Feng S, Guo W, Wen Y C, Yu Y 2007 Phys. Rev. A 76 063606Google Scholar
[50] Yang S J, Wu Q S, Feng S, Wen Y C, Yu Y 2008 Phys. Rev. A 77 035602Google Scholar
[51] Hu X H, Zhang X F, Zhao D, Luo H G, Liu W M 2009 Phys. Rev. A 79 023619Google Scholar
[52] Barenghi C F, Donnelly R J, Vinen W F 2001 Quantized Vortex Dynamics and Superfluid Turbulence (Berlin: Springer Press)
[53] Halperin W P, Tsubota M 2009 Progress in Low Temperature Physics: Quantum Turbulence (Amsterdam: Elsevier Press)
[54] Kusumura T, Tsubota M, Takeuchi H 2012 J. Phys. Conf. Ser. 400 012038Google Scholar
[55] Khamehchi M A, Hossain K, Mossman M E, Zhang Y, Busch T, Forbes M M, Engels P 2017 Phys. Rev. Lett. 118 155301Google Scholar
[56] Dalibard J, Gerbier F, Juzeliūnas G, Öhberg P 2011 Rev. Mod. Phys. 83 1523Google Scholar
[57] Han W, Zhang X F, Song S W, Saito H, Zhang W, Liu W M, Zhang S G 2016 Phys. Rev. A 94 033629Google Scholar
[58] Fedichev P O, Kagan Y, Shlyapnikov G V, Walraven J T M 1996 Phys. Rev. Lett. 77 2913Google Scholar
[59] Theis M, Thalhammer G, Winkler K, Hellwig M, Ruff G, Grimm R, Denschlag J H 2004 Phys. Rev. Lett. 93 123001Google Scholar
[60] Olshanii M 1998 Phys. Rev. Lett. 81 938Google Scholar
[61] Haller E, Gustavsson M, Mark M J, Danzl J G, Hart R, Pupillo G, Nägerl H C 2009 Science 325 1224Google Scholar
[62] Zhang R, Cheng Y, Zhai H, Zhang P 2015 Phys. Rev. Lett. 115 135301Google Scholar
[63] Pagano G, Mancini M, Cappellini G, Livi L, Sias C, Catani J, Inguscio M, Fallani L 2015 Phys. Rev. Lett. 115 265301Google Scholar
[64] Claussen N R, Donley E A, Thompson S T, Wieman C E 2002 Phys. Rev. Lett. 89 010401Google Scholar
[65] Kevrekidis P G, Theocharis G, Frantzeskakis D J, Malomed B A 2003 Phys. Rev. Lett. 90 230401Google Scholar
[66] Greiner M, Regal C A, Jin D S 2005 Phys. Rev. Lett. 94 070403Google Scholar
[67] Yamazaki R, Taie S, Sugawa S, Takahashi Y 2010 Phys. Rev. Lett. 105 050405Google Scholar
[68] Qi R, Zhai H 2011 Phys. Rev. Lett. 106 163201Google Scholar
[69] Infeld E, Rowlands G 1990 Nonlinear Waves, Solitons and Chaos (Cambridge: Cambridge University Press)
[70] Hirota R 1979 J. Phys. Soc. Jpn. 46 1681Google Scholar
[71] Nakamura A 1980 J. Phys. Soc. Jpn. 49 2380Google Scholar
[72] Nakamura A, Chen H H 1981 J. Phys. Soc. Jpn. 50 711Google Scholar
[73] Johnson R S 1999 Wave Motion 30 1Google Scholar
[74] Ko K, Kuehl H 1979 Phys. Fluids 22 1343Google Scholar
[75] Malomed B A 2006 Soliton Management in Periodic Systems (Berlin: Springer Press)
[76] Pelinovsky D E, Kevrekidis P G, Frantzeskakis D J, Zharnitsky V 2004 Phys. Rev. E 70 047604Google Scholar
[77] Kevrekidis P G, Pelinovsky D E, Stefanov A 2006 J. Phys. A: Math. Gen. 39 479Google Scholar
[78] Saito H, Ueda M 2003 Phys. Rev. Lett. 90 040403Google Scholar
[79] Abdullaev F K, Caputo J G, Kraenkel R A, Malomed B A 2003 Phys. Rev. A 67 013605Google Scholar
[80] Liang Z X, Zhang Z D, Liu W M 2005 Phys. Rev. Lett. 94 050402Google Scholar
[81] Cross M C, Hohenberg P C 1993 Rev. Mod. Phys. 65 851Google Scholar
[82] Abid M, Huepe C, Metens S, Nore C, Pham C T, Tuckerman L S, Brachet M E 2003 Fluid Dyn. Res. 33 509Google Scholar
[83] Cuypers Y, Maurel A, Petitjeans P 2003 Phys. Rev. Lett. 91 194502Google Scholar
[84] Yang T, Hu Z Q, Zou S, Liu W M 2016 Sci. Rep. 6 29066Google Scholar
[85] Busch T, Anglin J R 2001 Phys. Rev. Lett. 87 010401Google Scholar
[86] Wang L X, Dai C Q, Wen L, Liu T, Jiang H F, Saito H, Zhang S G, Zhang X F 2018 Phys. Rev. A 97 063607Google Scholar
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