非常規(guī)超導(dǎo)的平均場(chǎng)理論
發(fā)布時(shí)間:2018-08-28 20:20
【摘要】:本論文用平均場(chǎng)理論研究非常規(guī)超導(dǎo)體的物理性質(zhì)。我們用平均場(chǎng)方法自洽地求解非常規(guī)超導(dǎo)的能隙函數(shù),并進(jìn)一步算出比熱和倫敦穿透深度,以此來(lái)辨別超導(dǎo)中可能的配對(duì)方式。能隙函數(shù)的自洽方程是通過(guò)對(duì)平均場(chǎng)Hamiltonian做Bogoliubov變換得到的,我們求解該自洽方程,得到Bogoliubov準(zhǔn)粒子的能譜。在此基礎(chǔ)上得到超導(dǎo)比熱和弱磁場(chǎng)時(shí)的倫敦穿透深度。通過(guò)比較低溫時(shí)比熱和穿透深度與溫度的冪次關(guān)系,就能推斷超導(dǎo)電子的配對(duì)方式。在論文的最后,我們用3帶Hubbard模型研究最近發(fā)現(xiàn)的一類(lèi)超導(dǎo)體A2Cr3As3,發(fā)現(xiàn)其中f-wave的自旋三重態(tài)配對(duì)占主導(dǎo)。
[Abstract]:In this paper, the physical properties of unconventional superconductors are studied by means of the mean field theory. We use the mean field method to solve the energy gap function of the unconventional superconducting and further calculate the specific heat and the London penetration depth to identify the possible pairings in superconductivity. The self-consistent equation of the energy gap function is obtained by the Bogoliubov transformation of the mean field Hamiltonian. We solve the self-consistent equation and obtain the energy spectrum of the Bogoliubov quasiparticle. On this basis, the London penetration depth of superconducting specific heat and weak magnetic field is obtained. By comparing the power relationship between specific heat and penetration depth and temperature at low temperature, the matching mode of superconducting electrons can be inferred. At the end of the paper, we use the 3-band Hubbard model to study a class of recently discovered superconductors A _ 2Cr _ 3As _ 3, and find that the spin triplet pairing of f-wave is dominant.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TM26
本文編號(hào):2210504
[Abstract]:In this paper, the physical properties of unconventional superconductors are studied by means of the mean field theory. We use the mean field method to solve the energy gap function of the unconventional superconducting and further calculate the specific heat and the London penetration depth to identify the possible pairings in superconductivity. The self-consistent equation of the energy gap function is obtained by the Bogoliubov transformation of the mean field Hamiltonian. We solve the self-consistent equation and obtain the energy spectrum of the Bogoliubov quasiparticle. On this basis, the London penetration depth of superconducting specific heat and weak magnetic field is obtained. By comparing the power relationship between specific heat and penetration depth and temperature at low temperature, the matching mode of superconducting electrons can be inferred. At the end of the paper, we use the 3-band Hubbard model to study a class of recently discovered superconductors A _ 2Cr _ 3As _ 3, and find that the spin triplet pairing of f-wave is dominant.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TM26
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