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arXiv 1104.0220cond-mat.mes-hall
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四组分激子凝聚体的赝抗磁性

Pseudo diamagnetism of four component exciton condensates

Yuri G. Rubo, A. V. Kavokin

摘要:

我们分析了耦合量子阱中四组分激子凝聚基态的自旋结构随自旋相关相互作用和外加磁场的变化。四个分量对应于简并激子状态,其特征在于$\pm2$和$\pm1$自旋投影到结构的轴。结果表明,在较宽的参数范围内,体系的化学势随磁场的增大而增大,表明体系具有赝抗磁性。在这种情况下,向极化的双组分和单组分凝聚体的转变可以是一阶的。预测的效应是由$\pm2$和$\pm1$激子的能量守恒混合引起的。

英文摘要:

We analyze the spin structure of the ground state of four-component exciton condensates in coupled quantum wells as a function of spin-dependent interactions and applied magnetic field. The four components correspond to the degenerate exciton states characterized by $\pm2$ and $\pm1$ spin projections to the axis of the structure. We show that in a wide range of parameters, the chemical potential of the system increases as a function of magnetic field, which manifests a pseudo-diamagnetism of the system. The transitions to polarized two- and one-component condensates can be of the first-order in this case. The predicted effects are caused by energy conserving mixing of $\pm2$ and $\pm1$ excitons.

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