论文标题
沮丧的半填充器中的磁性围绕机制
Magnetic Kondo regimes in a frustrated half-filled trimer
论文作者
论文摘要
我们从理论上分析了三角形三重量子点的相图，该点具有强烈的现场排斥力与铁磁铅相结合。该模型包括局部或巡回磁矩，几何挫败感和近托筛选的磁性序列。我们确定这项竞争产生的所有阶段。我们发现，可以在零温度下实现三个近代阶段 - 常规阶段，即两阶段的延期，以及由铁磁临床效应产生的三个阶段，而这一阶段可以实现。特别是，我们发现量子点在这些阶段中的每个阶段都旋转。此外，我们讨论了在非零温度下阶段的命运，其中众多竞争能量尺度会导致跨界的复杂景观。每个近野制度都将其分成一对相位，一个未磁化，一个包含磁化量子点。我们在沮丧的近代格子中讨论了我们的结果。
We analyze theoretically the phase diagram of a triangular triple quantum dot with strong onsite repulsion coupled to ferromagnetic leads. This model includes the competition of magnetic ordering of local or itinerant magnetic moments, geometric frustration and Kondo screening. We identify all the phases resulting from this competition. We find that three Kondo phases -- the conventional one, the two-stage underscreened one, and the one resulting from the ferromagnetic Kondo effect -- can be realized at zero temperature, and all are very susceptible to the proximity of ferromagnetic leads. In particular, we find that the quantum dots are spin-polarized in each of these phases. Further, we discuss the fate of the phases at non-zero temperatures, where a plethora of competing energy scales gives rise to complex landscape of crossovers. Each Kondo regime splits into a pair of phases, one not magnetized and one comprising magnetically polarized quantum dots. We discuss our results in the context of heavy-fermion physics in frustrated Kondo lattices.
