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1、一种可能的ABB型激子超导体IntroductionSuperconductivity is one of the most fascinating phenomena in condensed matter physics. The discovery of superconductivity has revolutionized many technological advancements like magnetic resonance imaging (MRI), particle accelerators, and many more. Significant efforts hav
2、e been put into understanding the physics behind superconductivity. In this study, we investigate one of the superconductors which are an ABB-type exciton superconductor.Crystal and Structure of ABB-type Exciton SuperconductorIn the ABB-type exciton superconductor, the crystal structure consists of
3、stacked layers of A and B atoms. Within each layer, the B-atoms form a triangular lattice structure. The A-atom connects the B-atoms in the layers, and each layer is rotated by a particular angle with respect to the neighboring layer. The excitonic nature of the superconductor originates from the fa
4、ct that the charge carriers involved are excitons, which are bound pairs of electrons and holes.Superconductivity in ABB-type Exciton SuperconductorThe mechanism behind the superconductivity in the ABB-type exciton superconductor is the Cooper pairing of excitons. At low temperatures, the excitons b
5、ecome bound by Coulomb forces, which leads to the formation of Cooper pairs. The long-range order in the superconductor is attributed to the exciton condensation. The Cooper pairs are confined within a layer and tunnel through the lattice of B-atoms to the adjacent layer, hence establishing the long
6、-range order. As the temperature is lowered, the excitons become more tightly bound, which further enhances the superconductivity.Effects of Disorder and ImpuritiesThe superconductivity in the ABB-type exciton superconductor is influenced by disorder and impurities in the crystal. The excitons are s
7、ensitive to impurities as the Coulomb interaction is a long-range interaction. Any impurity in the crystal lattice will lead to an alteration in the interaction, thus disturbing the superconductivity. The type of disorder also plays a crucial role in determining the extent of the effect on the super
8、conductivity. The quenched disorder hinders the superconductivity at low temperatures, but it has little effect on the transition temperature Tc. However, in the case of annealed disorder, the transition temperature Tc is considerably reduced.ConclusionIn conclusion, we have discussed the crystal st
9、ructure of the ABB-type exciton superconductor and the mechanism behind the superconductivity through the Cooper pairing of excitons. The role of disorder and impurities in determining the extent of superconductivity has also been discussed. The study helps in understanding the physics behind the su
10、perconductivity in the ABB-type exciton superconductor and will play a vital role in designing materials for technological applications.Applications of ABB-type Exciton SuperconductorABB-type exciton superconductors have immense potential in various technological applications such as in the developm
11、ent of practical superconducting materials, quantum computing, and other high-speed electronic devices. Since the excitonic nature of ABB-type superconductors forms due to the strong Coulomb interaction, it is possible to manipulate these interactions to tune the strength of the superconductivity. T
12、his potential has been explored in making superconducting devices with high critical temperatures (Tc) and other unique properties. Moreover, the excitonic condensate has a long coherence length, making it ideal for making Josephson junctions, which have applications for superconducting quantum inte
13、rference devices (SQUIDs) and qubits in quantum computers.Impact of External ParametersThe superconductivity of ABB-type exciton superconductors can be altered or controlled by external parameters like electric fields, pressure, and magnetic fields. The electric field can cause a shift in the energy
14、 level, while the pressure and magnetic fields change the lattice structure and the interaction strength between the excitons, respectively. The strength of the magnetic field is particularly significant, as it affects the formation of Cooper pairs and their tunneling through the lattice structure.
15、The application of a magnetic field can enable the precise manipulation of the exciton condensate, making it more robust and stable. The magnetic field also affects the anisotropy, which can be exploited to create specific magnetic textures and vortex states.Future ChallengesThe study of ABB-type ex
16、citon superconductors is in its early stages, and many challenges remain to be addressed. One of the principal challenges is to discover or fabricate materials that exhibit both high Tc and high critical magnetic fields. Currently, most of the ABB-type exciton superconductors exhibit relatively low Tc values. The synthesis and purification of samples to meet the desired parameters is also a significant challenge. Additionally, the theoret
