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光学微腔中一维费米气的磁性关联特性

冯彦林 樊景涛 陈刚 贾锁堂

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光学微腔中一维费米气的磁性关联特性

冯彦林, 樊景涛, 陈刚, 贾锁堂

Magnetic properties of one-dimensional Fermi gases in an optical cavity

Feng Yan-Lin, Fan Jing-Tao, Chen Gang, Jia Suo-Tang
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  • 对于准一维两组分费米气与光学微腔耦合的系统, 证明了微腔光子的超辐射可以驱动原子系统的磁性转变, 该磁性转变与原子的失谐以及费米子的填充数密切相关. 对于无相互作用原子气, 在超辐射相区内平均场近似合理. 基于该近似, 分析了不同的填充和失谐情况下体系的静态自旋结构因子, 由此刻画出腔光子协助的磁性关联转变, 并得到了依赖于微腔参数的相图. 最后, 对可行的实验参数做了相关讨论.
    In this work we show that the superradiance of the cavity photons can give rise to a magnetic transformation for the atomic system when the quasi one-dimensional Fermi gases are coupled to an optical cavity. This magnetic transformation has a close relationship with the atomic detuning and the filling number. When the interaction between the atoms is neglected, the mean-field approximation may be used in the superradiant phase. In this approximation, we analyze the static spin structure factors of the system with different filling numbers and atomic detuning. Then we characterize the cavity photons-assisted magnetic transformation and obtain the phase diagrams which are dependent on the cavity parameters. Finally, the feasible experimental parameters of our results are also discussed.
      通信作者: 陈刚, chengang971@163.com
    • 基金项目: 国家重点研发计划(批准号: 2017YFA0304203)、国家自然科学基金(批准号: 11674200, 11804204)、教育部长江学者和创新团队发展计划(批准号: IRT13076)和山西省“1331工程”重点学科建设计划资助的课题.
      Corresponding author: Chen Gang, chengang971@163.com
    • Funds: Project supported by the National Key R&D Program of China (Grant No. 2017YFA0304203), the National Natural Science Foundation of China (Grant Nos. 11674200, 11804204), the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (Grant No. IRT13076), and the Fund for Shanxi “1331 Project” Key Subjects Construction, China.
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    Bloch I, Dalibard J, Zwerger W 2008 Rev. Mod. Phys. 80 885Google Scholar

    [2]

    Ritsch H, Demokos P, Brennecke F, Esslinger T 2013 Rev. Mod. Phys. 85 553Google Scholar

    [3]

    Baumann K, Guerlin C, Brennecke F, Esslinger T 2010 Nature (London) 464 1301Google Scholar

    [4]

    Landig R, Hruby L, Dogra N, Landini M, Mottl R, Donner T, Esslinger T 2016 Nature (London) 532 476Google Scholar

    [5]

    Hruby L, Dogra N, Landini M, Donner T, Esslinger T 2018 PNAS 115 3279Google Scholar

    [6]

    Lénard J, Morales A, Zupancic P, Esslinger T, Donner T 2017 Nature (London) 543 87Google Scholar

    [7]

    Lénard J, Morales A, Zupancic P, Donner T, Esslinger T 2017 Science 358 1415Google Scholar

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    Caballero-Benitez S F, Mekhov I B 2015 Phys. Rev. Lett. 115 243604Google Scholar

    [9]

    Dogra N, Brennecke F, Huber S D, Donner T 2016 Phys. Rev. A 94 023632Google Scholar

    [10]

    Chen Y, Yu Z, Zhai H 2016 Phys. Rev. A 93 041601(R)Google Scholar

    [11]

    Pan J S, Liu X J, Zhang W, Yi W, Guo G C 2015 Phys. Rev. Lett. 115 045303Google Scholar

    [12]

    Luo X W, Zhang C 2018 Phys. Rev. Lett. 120 263202Google Scholar

    [13]

    谷红明, 黄永清, 王欢欢, 武刚, 段晓峰, 刘凯, 任晓敏 2018 物理学报 67 144201Google Scholar

    Gu H M, Huang Y Q, Wang H H, Wu G, Duan X F, Liu K, Ren X M 2018 Acta Phys. Sin. 67 144201Google Scholar

    [14]

    Parsons M F, Mazurenko A, Chiu C S, Ji G, Greif D, Greiner M 2016 Science 353 1253Google Scholar

    [15]

    Boll M, Hilker T A, Salomon G, Omran A, Nespolo J, Pollet L, Bloch I, Gross C 2016 Science 353 1257Google Scholar

    [16]

    Cheuk L W, Nichols M A, Lawrence K R, Okan M, Zhang H, Khatami E, Trivedi N, Paiva T, Rigol M, Zwierlein M W 2016 Science 353 1260Google Scholar

    [17]

    Hilker T A, Salomon G, Grusdt F, Omran A, Boll M, Demler E, Bloch I, Gross C 2017 Science 357 484Google Scholar

    [18]

    Salomon G, Koepsell J, Vijayan J, Hilker T A, Nespolo J, Pollet L, Bloch I, Gross C 2019 Nature 565 56

    [19]

    Mazurenko A, Chiu C S, Ji G, Parsons M F, Kanasz-Nagy M, Schmidt R, Grusdt F, Demler E, Greif D, Greiner M 2017 Nature 545 462Google Scholar

    [20]

    徐志君, 刘夏吟 2011 物理学报 60 120305Google Scholar

    Xu Z J, Liu X Y 2011 Acta Phys. Sin. 60 120305Google Scholar

    [21]

    秦帅锋, 郑公平, 马骁, 李海燕, 童晶晶, 杨博 2013 物理学报 62 110304Google Scholar

    Qin S F, Zheng G P, Ma X, Li H Y, Tong J J, Yang B 2013 Acta Phys. Sin. 62 110304Google Scholar

    [22]

    Sun N, Zhang P F, Zhai H 2018 arXiv: 1808 03966v1 [cond-mat.quant-gas]

    [23]

    Fan J T, Zhou X F, Zheng W, Yi W, Chen G, Jia S T 2018 Phys. Rev. A 98 043613Google Scholar

    [24]

    Giuliani G, Vignale G 2005 Quantum Theory of the Electron Liquid (Cambridge: Cambridge University Press) pp29-36

    [25]

    Su W P, Schrieffer J R, Heeger A J 1979 Phys. Rev. Lett. 42 1698Google Scholar

    [26]

    Peierls R E 1955 Quantum Theory of Solids (Oxford: Clarendon Press) p108

    [27]

    Ogata M, Shiba H 1990 Phys. Rev. B 41 2326Google Scholar

    [28]

    Costa N C, Mendes-Santos T, Paiva T, Santos R R dos, Scalettar R T 2016 Phys. Rev. B 94 155107Google Scholar

    [29]

    Chang C-C, Zhang S 2008 Phys. Rev. B 78 165101Google Scholar

    [30]

    Hart R A, Duarte P M, Yang T L, Liu X, Paiva T, Khatami E, Scalettar R T, Trivedi N, Huse D A, Hulet R G 2015 Nature (London) 519 211Google Scholar

    [31]

    Liu X-J, Law K T, Ng T K 2014 Phys. Rev. Lett. 112 086401Google Scholar

    [32]

    Klinder J, Keβler H, Wolke M, Mathey L, Hemmerich A 2015 PNAS 112 3290Google Scholar

    [33]

    Landig R, Brennecke F, Mottl R, Donner T, Esslinger T 2015 Nat. Commun. 6 7046Google Scholar

  • 图 1  (a)超冷费米气沿着腔轴$\hat x$方向被俘获在准一维背景光学晶格中, 费米气被两束圆偏振的横向(沿着$\hat z$方向)抽运激光驱动, 腔模由一束线偏振的纵向(沿着$\hat x$方向)驱动光驱动; (b)费米子的能级跃迁图, 图中相关的跃迁过程和符号的定义见正文

    Fig. 1.  (a) The ultracold fermions are trapped in a quasi-one-dimensional background optical lattice along the cavity axis $\hat x$. These fermions are pumped by two circular-polarized transverse (along $\hat z$) lasers and the cavity mode is driven by a linear-polarized longitudinal (along $\hat x$) laser. (b) the atomic energy levels and their transition. See main text for the corresponding transition processes and the definition of the labels.

    图 2  a)蓝失谐的情况$\Delta > 0$, 光场$\left| \alpha \right|$在不同的晶格填充下随耦合强度$\eta_ {\rm{A}}$的变化. 图中其他参数的选择: ${V_0} = 5{E_{\rm{R}}}$, $\kappa = 100{E_{\rm{R}}}$, ${\Delta _{\rm{c}}} = - 10{E_{\rm{R}}}$, ${k_{\rm{B}}}T = {E_{\rm{R}}}/200$$U = 5{E_{\rm{R}}}$; (b)红失谐的情况$\Delta < 0$, 光场$\left| \alpha \right|$在不同的晶格填充下随耦合强度$\eta_ {\rm{A}}$的变化. 图中其它参数的选择: ${V_0} = - 5{E_{\rm{R}}}$, $\kappa = 100{E_{\rm{R}}}$, ${\Delta _{\rm{c}}} = - 100{E_{\rm{R}}}$, ${k_{\rm{B}}}T = {E_{\rm{R}}}/200$$U = - {E_{\rm{R}}}$. 我们考虑的具有80个格点的晶格对应不同的填充, 其中kF/ER不同的值对应不同的填充, kF为费米动量

    Fig. 2.  (a) The cavity field $\left| \alpha \right|$ for systems in different fillings with $\Delta > 0$. The plotted parameters are chosen as ${V_0} = 5{E_{\rm{R}}}$, $\kappa = 100{E_{\rm{R}}}$, ${\Delta _{\rm{c}}} = - 10{E_{\rm{R}}}$, ${k_{\rm{B}}}T = {E_{\rm{R}}}/200$, and $U = 5{E_{\rm{R}}}$. (b) the cavity field $\left| \alpha \right|$ for systems in different fillings with $\Delta < 0$. The plotted parameters are chosen as ${V_0} = - 5{E_{\rm{R}}}$, $\kappa = 100{E_{\rm{R}}}$, ${\Delta _{\rm{c}}} = - 100{E_{\rm{R}}}$, ${k_{\rm{B}}}T = {E_{\rm{R}}}/200$, and $U = - {E_{\rm{R}}}$. We consider a lattice of sites 80 with different fillings.

    图 3  静态自旋结构因子${S_z}\left( k \right)$ (a) ${k_{\rm{F}}}/{E_{\rm{R}}}=3/8$; (b) ${k_{\rm{F}}}/{E_{\rm{R}}}=1/2$; (c) ${k_{\rm{F}}}/{E_{\rm{R}}}=5/8$. (图中对应的其它参数的选择与图2(a)中一致)

    Fig. 3.  The spin structure factors ${S_z}\left( k \right)$ for systems in different fillings: (a) ${k_{\rm{F}}}/{E_{\rm{R}}}=3/8$; (b) ${k_{\rm{F}}}/{E_{\rm{R}}}=1/2$; (c) ${k_{\rm{F}}}/{E_{\rm{R}}}=5/8$ (The plotted parameters are the same as those in Fig. 2(a)).

    图 4  静态自旋结构因子${S_z}\left( k \right)$ (a) ${k_{\rm{F}}}/{E_{\rm{R}}}=3/8$; (b) ${k_{\rm{F}}}/{E_{\rm{R}}}=1/2$; (c) ${k_{\rm{F}}}/{E_{\rm{R}}}=5/8$(图中对应的其他参数的选择与图2(b)中一致)

    Fig. 4.  The spin structure factors ${S_z}\left( k \right)$ for systems in different fillings: (a) ${k_{\rm{F}}}/{E_{\rm{R}}}=3/8$; (b) ${k_{\rm{F}}}/{E_{\rm{R}}}=1/2$; (c) ${k_{\rm{F}}}/{E_{\rm{R}}}=5/8$ (The plotted parameters are the same as those in Fig. 2(b)).

    图 5  (a)蓝失谐时${k_{\rm{F}}} - {\eta _{\rm{A}}}$平面上的相图(M, AF-SR和FM-SR分别代表金属相、反铁磁关联的超辐射相和铁磁关联的超辐射相, 其它参数的选择与图2(a)相同); (b)红失谐时${k_{\rm{F}}} - {\eta _A}$平面上的相图(AF-SR代表反铁磁关联的超辐射相, 对应的其他参数的选择与图2(b)中一致)

    Fig. 5.  (a) The phase diagram in the ${k_{\rm{F}}} - {\eta _A}$ plane for the system with blue-detuned atomic detuning (M, AF-SR, and FM-SR correspond to metallic phase, antiferromagnetic superradiant phase, and ferromagnetic superradiant phase, respectively. The plotted parameters are the same as those in Fig. 2(a)); (b) the phase diagram in the ${k_{\rm{F}}} - {\eta _{\rm{A}}}$ plane for the system with red-detuned atomic detuning (AF-SR corresponds to the antiferromagnetic superradiant phase. The plotted parameters are the same as those in Fig. 2(b)).

  • [1]

    Bloch I, Dalibard J, Zwerger W 2008 Rev. Mod. Phys. 80 885Google Scholar

    [2]

    Ritsch H, Demokos P, Brennecke F, Esslinger T 2013 Rev. Mod. Phys. 85 553Google Scholar

    [3]

    Baumann K, Guerlin C, Brennecke F, Esslinger T 2010 Nature (London) 464 1301Google Scholar

    [4]

    Landig R, Hruby L, Dogra N, Landini M, Mottl R, Donner T, Esslinger T 2016 Nature (London) 532 476Google Scholar

    [5]

    Hruby L, Dogra N, Landini M, Donner T, Esslinger T 2018 PNAS 115 3279Google Scholar

    [6]

    Lénard J, Morales A, Zupancic P, Esslinger T, Donner T 2017 Nature (London) 543 87Google Scholar

    [7]

    Lénard J, Morales A, Zupancic P, Donner T, Esslinger T 2017 Science 358 1415Google Scholar

    [8]

    Caballero-Benitez S F, Mekhov I B 2015 Phys. Rev. Lett. 115 243604Google Scholar

    [9]

    Dogra N, Brennecke F, Huber S D, Donner T 2016 Phys. Rev. A 94 023632Google Scholar

    [10]

    Chen Y, Yu Z, Zhai H 2016 Phys. Rev. A 93 041601(R)Google Scholar

    [11]

    Pan J S, Liu X J, Zhang W, Yi W, Guo G C 2015 Phys. Rev. Lett. 115 045303Google Scholar

    [12]

    Luo X W, Zhang C 2018 Phys. Rev. Lett. 120 263202Google Scholar

    [13]

    谷红明, 黄永清, 王欢欢, 武刚, 段晓峰, 刘凯, 任晓敏 2018 物理学报 67 144201Google Scholar

    Gu H M, Huang Y Q, Wang H H, Wu G, Duan X F, Liu K, Ren X M 2018 Acta Phys. Sin. 67 144201Google Scholar

    [14]

    Parsons M F, Mazurenko A, Chiu C S, Ji G, Greif D, Greiner M 2016 Science 353 1253Google Scholar

    [15]

    Boll M, Hilker T A, Salomon G, Omran A, Nespolo J, Pollet L, Bloch I, Gross C 2016 Science 353 1257Google Scholar

    [16]

    Cheuk L W, Nichols M A, Lawrence K R, Okan M, Zhang H, Khatami E, Trivedi N, Paiva T, Rigol M, Zwierlein M W 2016 Science 353 1260Google Scholar

    [17]

    Hilker T A, Salomon G, Grusdt F, Omran A, Boll M, Demler E, Bloch I, Gross C 2017 Science 357 484Google Scholar

    [18]

    Salomon G, Koepsell J, Vijayan J, Hilker T A, Nespolo J, Pollet L, Bloch I, Gross C 2019 Nature 565 56

    [19]

    Mazurenko A, Chiu C S, Ji G, Parsons M F, Kanasz-Nagy M, Schmidt R, Grusdt F, Demler E, Greif D, Greiner M 2017 Nature 545 462Google Scholar

    [20]

    徐志君, 刘夏吟 2011 物理学报 60 120305Google Scholar

    Xu Z J, Liu X Y 2011 Acta Phys. Sin. 60 120305Google Scholar

    [21]

    秦帅锋, 郑公平, 马骁, 李海燕, 童晶晶, 杨博 2013 物理学报 62 110304Google Scholar

    Qin S F, Zheng G P, Ma X, Li H Y, Tong J J, Yang B 2013 Acta Phys. Sin. 62 110304Google Scholar

    [22]

    Sun N, Zhang P F, Zhai H 2018 arXiv: 1808 03966v1 [cond-mat.quant-gas]

    [23]

    Fan J T, Zhou X F, Zheng W, Yi W, Chen G, Jia S T 2018 Phys. Rev. A 98 043613Google Scholar

    [24]

    Giuliani G, Vignale G 2005 Quantum Theory of the Electron Liquid (Cambridge: Cambridge University Press) pp29-36

    [25]

    Su W P, Schrieffer J R, Heeger A J 1979 Phys. Rev. Lett. 42 1698Google Scholar

    [26]

    Peierls R E 1955 Quantum Theory of Solids (Oxford: Clarendon Press) p108

    [27]

    Ogata M, Shiba H 1990 Phys. Rev. B 41 2326Google Scholar

    [28]

    Costa N C, Mendes-Santos T, Paiva T, Santos R R dos, Scalettar R T 2016 Phys. Rev. B 94 155107Google Scholar

    [29]

    Chang C-C, Zhang S 2008 Phys. Rev. B 78 165101Google Scholar

    [30]

    Hart R A, Duarte P M, Yang T L, Liu X, Paiva T, Khatami E, Scalettar R T, Trivedi N, Huse D A, Hulet R G 2015 Nature (London) 519 211Google Scholar

    [31]

    Liu X-J, Law K T, Ng T K 2014 Phys. Rev. Lett. 112 086401Google Scholar

    [32]

    Klinder J, Keβler H, Wolke M, Mathey L, Hemmerich A 2015 PNAS 112 3290Google Scholar

    [33]

    Landig R, Brennecke F, Mottl R, Donner T, Esslinger T 2015 Nat. Commun. 6 7046Google Scholar

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出版历程
  • 收稿日期:  2018-11-01
  • 修回日期:  2018-12-04
  • 上网日期:  2019-02-01
  • 刊出日期:  2019-02-20

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