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采用关联表象变分波函数方案, 介入三个非经典关联效应, 求解有限温度双能态自旋-晶格声子耦合量子隧道系统的非经典态, 着重研究化解由于粒子自旋-单声子相互作用引起的量子涨落导致双能态系统的退相干性量子耗散. 这三个非经典关联效应是: 1) 声子位移-粒子自旋 (σz)间强非绝热关联; 2) 声子压缩态效应及其伴随发生的单声子相干态-声子压缩态两过程相干效应; 3) 由关联表象导致的声子位移(UD)与声子压缩(US)的表象关联非绝热修正. 结果表明: 由于引入粒子自旋-双声子相互作用, 大幅度地增强了声子场压缩态, 特别是更进一步极大幅度地增强了非经典压缩-相干态效应. 因此, 由粒子自旋-单声子相互作用产生的Debye-Walle相干弹性散射效应导致量子隧道项(-Δ0σx)的强烈指数衰减及其伴随严重的量子相干损失的极大幅度的抑制, 并且自旋-晶格声子耦合量子隧道系统的非经典态能量大幅度降低.
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关键词:
- 非经典能态 /
- 量子隧穿相干损失 /
- 自旋-双声子相互作用 /
- 压缩相干态效应
Including the spin-two-phonon interaction, for the two-state tunneling system with the spin coupled to the lattice phonon (i.e., spin-lattice phonon coupling model) at a finite temperature, the non-classical energy state and the quantum coherence dissipation are studied by the expansion approach of the correlated squeezed-coherent state of phonon. To restrain the quantum coherence loss caused by the Debye-Waller’s coherent scattering of the particle spin by the coherent phonons, the non-classical correlation effects are used in our research with the special consideration of the spin-two-phonon interaction, i.e., 1) the particle spin-displaced phonon state correlation; 2) the process coherence between the one-phonon coherent state and the phonon squeezed state which originates from the squeezed-coherent state of phonon; 3) the renormalization of the phonon displacement. We find the new phenomena that the phonon squeezed state is enhanced significantly due to the particle spin-two phonon interaction, in particular, at the same time the effects of the squeezed coherent state and the representation correlation will be essentially increased. Therefore, the striking decline in the quantum tunneling (Δ0σx) and the serious quantum coherence loss by the Debye-Waller coherent scattering are restricted more noticeably, as a result, the energy of the non-classical state for the two-level system with spin coupled to the lattice phonon is much lower.-
Keywords:
- non-classical energy state /
- quantum tunneling coherence loss /
- spin-two-phonon interaction /
- squeezed coherent state effect
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[43] Irish E K 2007 Phys. Rev. Lett. 99 173601
[44] Liu T, Wang K L, Feng M 2007 J. Phys. B 40 1967
[45] Zheng H, Zhu S Y, Zubairy M S 2008 Phys. Rev. Lett. 101 200404
[46] Liu T, Wang K L, Feng M 2009 EPL 86 54003
[47] Akhiezer A I, Bargakhter V G, Peletminskii S V 1968 Spin Wave (North-Halland: Amsterdam)
[48] Mandel L, Wolf E 1995 Optical Coherence and Quantum Optics (Cambridge: Cambridge University Press) p1042-1047
[49] Majernikava E, Koval J 1998 Physica 37 23
-
[1] Leggett A J, Chakravarty A T, Dorsey A T 1987 Rev. Mod. Phys. 59 1
[2] Weiss U 1993 Quantum Dissipative Systems (Singapore: World Scientipic)
[3] Schleich W P 2001 Quantum Optics in Phase Space (Belin: WILEY-VCH Verlag Belin GmbH) p532
[4] Orszag M 2000 Quantum Qptics (Belin Heidelbeg: Springer-Verlag) p106
[5] Mahan G D 1981 Many-Particle Physics (New York: Plenum Press) pp524-528
[6] Yuan X L, Shi Y, Yang H G, Pu H M, Wu J, Zhao B, Zhang R, Zheng Y K 2000 Acta Phys. Sin. 49 2037 (in Chinese) [袁晓丽, 施毅, 杨红官, 卜惠明, 吴军, 赵波, 张荣, 郑有科 2000 49 2037]
[7] Wang T H, Li H W, Zhou J M 2001 Chin. Phys. 10 844
[8] Liu M, Wang Z O, He Y L, Jiang X L 1998 Acta Phys. Sin. 47 699 (in Chinese) [刘明, 王子欧, 何宇亮, 江兴流 1998 47 699]
[9] Zheng H 2004 J. Eur. Phys. B 38 559
[10] Wu Z J, Zhu K D, Yuan X Z, Zheng H 2005 Acta Phys. Sin. 54 3346 (in Chinese) [吴卓杰, 朱卡的, 袁晓忠, 郑杭 2005 54 3346]
[11] Hartman U, Wilhelm F K 2004 Phys. Rev. B 69 161309
[12] Brandes T, Kramer B 1999 Phys. Rev. Lett. 83 3021
[13] Aguado R, Brandes T 2004 Phys. Rev. Lett. 92 206601
[14] Brandes T, Aguado R, Platero G 2004 Phys. Rev. B 69 205326
[15] Chen H, Zhang Y M 1985 Phys. Rev. B 32 4410
[16] Sassetti M, Weiss U 1990 Phys, Rev. Lett. 65 2262
[17] Sassetti M, Weiss U 1990 Phys, Rev. B 41 5383
[18] Chen H, Zhang Y M, Wu X 1989 Phys. Rev. B 39 546
[19] Shi Y L, Chen H, Wu X 1993 Acta Phys. Sin. 42 1162 (in Chinese) [石云龙, 陈鸿, 吴翔 1993 42 1162]
[20] Lo C F, Sollie R 1991 Phys. Rev. B 44 5013
[21] Chakravarty S, Rudnick J 1995 Phys. Rev. Lett. 75 501
[22] Wurger A 1997 Phys. Rev. Lett. 78 1759
[23] Volker K 1998 Phys. Rev. B 58 1862
[24] Costi T A, Kieffer C 1996 Phys. Rev. Lett. 76 1683
[25] Costi T A 1998 Phys. Rev. Lett. 80 1038
[26] Egger R, Mak C H 1994 Phys. Rev. B 50 15210
[27] Stoskburger J T, Mak C H 1998 Phys. Rev. Lett. 80 2657
[28] Silbey R, Harris R A 1984 J. Chem Phys. 80 2615
[29] Hartmann L, Goychak I, Grifonim, Hänggi P 2000 Phys. Rev. E 61 4687
[30] Lehle H, Ankerhold J 2004 J. Chem. Phys. 120 1436
[31] Zhang M, Zhang S, Pollak E 2004 J. Chem. Phys. 120 9630
[32] Stock G, Thoss M 2005 Adv. Chem. Phys. 131 243
[33] Marten-Fierro E, Pollak E 2007 J. Chem. Phys. 126 164108
[34] Mhlbacher L, Egger R 2003 J. Chem. Phys. 118 179
[35] Wang H, Thoss M, Miller W 2001 J. Chem. Phys. 115 2979
[36] Bulla R, Tong N G, Vojta M 2003 Phys. Rev. Lett. 91 170601
[37] Anders F B, Schiller A 2006 Phys. Rev. B 74 245113
[38] Thoss M, Wang H 2006 Chem. Phys. 322 210
[39] Craig I R, Wang H, Thoss M 2007 J. Chem. Phys. 127 144503
[40] Wang H, Thoss M 2008 New J. Phys. 10 115005
[41] Larson J 2007 Phys. Scr. 76 146
[42] Larson J, Moya-Cessa H 2008 Phys. Scr. 77 065704
[43] Irish E K 2007 Phys. Rev. Lett. 99 173601
[44] Liu T, Wang K L, Feng M 2007 J. Phys. B 40 1967
[45] Zheng H, Zhu S Y, Zubairy M S 2008 Phys. Rev. Lett. 101 200404
[46] Liu T, Wang K L, Feng M 2009 EPL 86 54003
[47] Akhiezer A I, Bargakhter V G, Peletminskii S V 1968 Spin Wave (North-Halland: Amsterdam)
[48] Mandel L, Wolf E 1995 Optical Coherence and Quantum Optics (Cambridge: Cambridge University Press) p1042-1047
[49] Majernikava E, Koval J 1998 Physica 37 23
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