带有电子-双声子相互作用的一维铁磁性介观环的非经典本征态和非经典本征持续电流

罗质华; 梁国栋

doi:10.7498/aps.61.057303

摘要

在一维铁磁性织构介观环的基础上, 计及电子-双声子相互作用, 介入了三项非经典效应抑制电子-单声子相互作用引起的量子涨落效应: 1) 跳步电子-单声子相干态关联效应；2) 由压缩相干态引起的声子压缩态-单声子相干态间过程关联效应；3) 声子位移-声子压缩态的表象关联效应．从结果来看, 电子-双声子相互作用明显加强了压缩效应(增大压缩参量), 而跳步电子-单声子相干态关联效应引起本征能量大幅度下降, 持续电流大幅度增加．特别是介入了声子压缩态-单声子相干态间过程关联效应后, 声子压缩参量远大于理想压缩态相应的压缩参量, 有效地抑制了Debye-Waller(D-W)效应．当声子压缩态-单声子相干态间过程关联与声子位移重整化效应结合在一起时, 声子场的压缩将更大幅度地增加, D-W效应(参量wph)将更大幅度地减小, wph wph(0), 从而极大幅度地抑制了电子-单声子相互作用导致的量子涨落效应. 这样一来, 非经典态本征能量En极大幅度地下降, En En(0), 与此同时, 本征持续电流振幅In 则极大幅度地增大, In In(0).

关键词:

Abstract

For the one-dimensional mesoscopic ring with the ferromagnetic texture, to restrain the quantum fluctuations caused by the electron-one-phonon interaction, the non-classical correlation effects are used in our research to solve this puzzling problem, i.e. 1) the hopping electron-displaced phonon state correlation; 2) the process correlation between the phonon squeezed state, and the one-phonon coherent state, originating from the squeezed coherent state of phonon; 3) the renormalization of the phonon displacement. It is found that due to the electron-two phonon interaction, the squeezing effect of phonon is enhanced significantly. Because of the effect of the electron-displaced phonon correlation the non-classical eigen state energy declines significantly and the amplitude of the persistent current increases substantially. Particularly the process correlation between the squeezed phonon state and the one-phonon coherent state is by far the most important contribution to these non-classical effects. First of all, this effect more greatly increases the squeezing effect of phonon field in contrast to the ideal squeezed state. As a result, it will restrain effectively the Debye-Waller effect (factor wph) with wph wph(0). Furthermore, when we combine the effective renormalization of the phonon displacement with the effect of process correlation between the phonon squeezed state and the one-phonon coherent state, the phonon squeezing effect will increases substantially, at the same time, the D-W effect decreased more substantially (wph wph(0), thereby weakening the quantum fluctuation to a bigger degree. With these results, the non-classical eigen energy (En) is much lowered (En En(0)), while the amplitude of eigen persistent current is increased most significantly (In In(0)).

Keywords:

作者及机构信息

罗质华¹,
梁国栋²

1.
广东第二师范学院物理系, 广州 510303;

2.
暨南大学光电工程系, 广州 510632

基金项目: 国家自然科学基金(批准号:10574163)资助的课题.

Authors and contacts

Luo Zhi-Hua¹,
Liang Guo-Dong²

1.
Department of Physics, Guangdong University of Education, Guangzhou 510303, China;

2.
Department of Optoelectronic Enginecring, Jinan University, Guangzhou 510632, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 10574163).

参考文献

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施引文献

[1]	Buttiker M, Imry Y, Landauer R 1983 Phys. Lett. A 96 365
[2]	Chandrasekhar V, Webb R A, Brady M J, Ketchen M B, GailagherW J, Kleinsasser A 1991 Phys. Rev. Lett. 67 3578
[3]	Cheung H F, Gefen Y, Riedel E K, Shih W H 1988 Phys. Rev. B37 6050
[4]	Ambegaoker V, Eckern U 1990 Phys. Lett. 65 381
[5]	Altshuler B L, Gelfan Y, Imry Y 1991 Phys. Rev. Lett. 66 88
[6]	Bouzerar G, Poilblanc D, Monlambaux G 1994 Phys. Rev. B 498258
[7]	Lévy L P, Dolan G, Dansmuir J, Bouchait H 1990 Phys. Rev. Lett.64 2074
[8]	Mailly D, Chapelier C, Benoid A 1993 Phys. Rev. Lett. 70 2120
[9]	Grüner G 1994 Rev. Mod. Phys. 66 1
[10]	Ye J F, Ye F, Ding G H 2003 Acta Phys. Sin. 52 468 (in Chinese) [叶剑斐, 叶飞, 丁国辉 2003 52 468]
[11]	Giamarchi T, Shastry B S 1995 Phys. Rev. B 51 10915
[12]	Wang J, Ma Z S 1995 Phys. Rev. B 52 14892
[13]	Liang S D, Bai Y H, Beng B 2006 Phys. Rev. B 74 113304
[14]	Citro R, Romeo F 2007 Phys. Rev. B 75 073306
[15]	Sun Q F, Xie X C, Wang J 2007 Phys. Rev. Lett. 98 196801
[16]	Niliionl J, Eckler H P, Johanness O 2007 Phys. Rev. B 76 73408
[17]	Zhao H K 2005 Phys. Lett. A 342 468
[18]	Liang F Y, Li H M, Li Y J 2006 Acta Phys. Sin. 55 830 (in Chinese) [梁芳营, 李汉明, 李英骏 2006 55 830]
[19]	Wu S Q, Sun W L, Yu W L,Wang S J 2005 Acta Phys. Sin. 542910 (in Chinese) [吴绍全, 孙威立, 余万伦, 王顺金 2005 54 2910]
[20]	Chen X W, He D J, Wu S Q, Song K H 2006 Acta Phys. Sin. 554287 (in Chinese) [谌雄文, 贺达江, 吴绍全, 宋克慧 2006 55 4287]
[21]	Dajkal J, Szopal M, Voardas Z 2004 Phys. Rev. B 69 45305
[22]	Sheng J S, Kai C 2006 Phys. Rev. B 74 235315
[23]	Wu J N, Chang M C 2005 Phys. Rev. B 72 172405
[24]	Wu H 2008 Chin. Phys. B 17 3026
[25]	Liu P, Xiong S J 2009 Chin. Phys. B 18 5414
[26]	Xu N, Ding JW,Ma M M, Jang X 2010 Chin. Phys. B 19 016101
[27]	Ma M M, Ding J W, Chen H B, Xu N 2009 Acta Phys. Sin. 582726 (in Chinese) [马明明, 丁建文, 陈宏波, 徐宁 2009 58 2726]
[28]	Xu N, Ding JW, Chen H B, MaM M2009 Chin. Phys. B 18 2030
[29]	Xu N, Ding JW,MaM M, Tang X 2010 Chin. Phys. B 19 016101
[30]	Du J, Wang S X, Yuan A G 2010 Acta Phys. Sin. 59 2767 (inChinese) [杜坚, 王素新, 袁爱国 2010 59 2767]
[31]	Chen X W, Chen B J, Shi Z G, Song K H 2009 Acta Phys. Sin. 592767 (in Chinese)[谌雄文, 谌宝菊, 施振刚, 宋克慧 2009 58 2720]
[32]	Luo Z H, Cao X J, Yu C F 2011 Chin. Phys. B 20 067103
[33]	Hamutal B S, Ora E W, Imryl Y 2009 Phys. Rev. B 80 02459
[34]	Bouchiat H 2008 Mesoscop. Phys. 1 7
[35]	Zelgak O M 2008 Phys. Rev. B 78 125305
[36]	Feilhauer J, Mo?sko M 2008 Physica E 40 1582
[37]	Luo Z H, Liang G D 2011 Acta Phys. Sin. 60 037303 (in Chinese) [罗质华, 梁国栋 2011 60 037303]
[38]	Loss D, Goldbart P 1992 Phys. Rev. B 45 13544
[39]	Kusakabe K, Aoki H 1994 Phys. Rev. Lett. 72 144
[40]	Ivanov V A, Zhuravlev MY, Murayama Y, Nakajima S 1996 JETPLett. 64 148
[41]	Majernikava E, Koval J 1998 Physica 37 23
[42]	Mandel L, Wolf E 1995 Optical Coherence and Guantum Optics(Cambridge University Press) pp1042-1047
[43]	Yu C F, Liang G D, Cao X J 2008 Acta Phys. Sin. 4402 (in Chinese) [余超凡, 梁国栋, 曹锡金 2008 57 4402]
[44]	Wu S S, Ma Z S 1996 Phys. Rev. B 53 16372

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