铜氧化物超导体中的玻色-费米子对偶性和亚稳性
Boson-Fermion Duality and Metastability in Cuprate Superconductors
摘要：
铜氧化物高T $_c$材料中的内在结构亚稳性，在CuO $_2$平面的棋盘域结构中得到证明，局部地破坏平移和旋转对称性。这种纳米尺寸的单向域的动态电荷-变形波动，涉及Cu-O-Cu分子键，导致嵌入在相关费米液体中的共振波动的抗磁性对。因此，单粒子光谱特性同时获得（i）费米低能Bogoliubov分支的传播库珀对和（ii）玻色子局域玻璃结构的紧密结合的状态，他们在高能量。单粒子激发的部分局部化导致费米表面的分离，因为巡回费米子和部分局部化费米子对之间的交换耦合的强度在从节点移动到反节点时增加。这也是为什么在空穴掺杂时，束缚费米子对主要聚集在反节点附近，并最终以各向异性的方式凝聚，跟踪单粒子谱中的间隙。
英文摘要：
The intrinsic structural metastability in cuprate high T$_c$ materials, evidenced in a checker-board domain structure of the CuO$_2$ planes, locally breaks translational and rotational symmetry. Dynamical charge - deformation fluctuations of such nano-size unidirectional domains, involving Cu-O-Cu molecular bonds, result in resonantly fluctuating diamagnetic pairs embedded in a correlated Fermi liquid. As a consequence, the single-particle spectral properties acquire simultaneously (i) fermionic low energy Bogoliubov branches for propagating Cooper pairs and (ii) bosonic localized glassy structures for tightly bound states of them at high energies. The partial localization of the single-particle excitations results in a fractionation of the Fermi surface as the strength of the exchange coupling between itinerant fermions and partially localized fermion pairs increases upon moving from the nodal to the anti-nodal point. This is also the reason why, upon hole doping, bound fermion pairs predominantly accumulate near the anti-nodal points and ultimately condense in an anisotropic fashion, tracking the gap in the single particle spectrum.
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