论文标题
探索与量子信息相关的宏伟材料：有机铁虫v [tcne] x中低温下的超低阻尼
Exploring a quantum-information-relevant magnonic material: Ultralow damping at low temperature in the organic ferrimagnet V[TCNE]x
论文作者
论文摘要
量子信息科学和工程需要用于基于木元素的量子量操作的新型低损失磁性材料。传统上，由于在室温附近的微波电子设备中的应用而驱动的低损坏磁性材料，从需要在量子信息科学和技术中用于许多应用的低温温度下进行操作，因此获得了额外的限制。 Yttrium Iron Garnet（YIG）一直是几十年来一直是首选的材料，但具有强大磁性和超低阻尼的分子材料的出现已经为探索开辟了新的途径。 Specifically, thin-films of vanadium tetracyanoethylene (V[TCNE]x) can be patterned into the multiple, connected structures needed for hybrid quantum elements and have shown room-temperature Gilbert damping (α = 4 \times 10^-5) that rivals the intrinsic (bulk) damping otherwise seen only in highly-polished YIG spheres (far more challenging to integrate into arrays).在这里，我们介绍了V [TCNE] X薄膜的低温磁化动力学的全面，系统的研究，这对它们在量子系统中的应用有影响。这些研究揭示了温度驱动的，应变依赖性的磁各向异性，可补偿薄膜形状各向异性，并在5 K处恢复磁共振线宽，与室温值相当（大约为9.4 GHz时2 g）。我们可以在非常稀释的顺磁性杂质散射的背景下考虑V [TCNE] X线宽的这些变化，并随着温度进一步降低，预期额外的线宽缩小。
Quantum information science and engineering requires novel low-loss magnetic materials for magnon-based quantum-coherent operations. The search for low-loss magnetic materials, traditionally driven by applications in microwave electronics near room-temperature, has gained additional constraints from the need to operate at cryogenic temperatures for many applications in quantum information science and technology. Whereas yttrium iron garnet (YIG) has been the material of choice for decades, the emergence of molecule-based materials with robust magnetism and ultra-low damping has opened new avenues for exploration. Specifically, thin-films of vanadium tetracyanoethylene (V[TCNE]x) can be patterned into the multiple, connected structures needed for hybrid quantum elements and have shown room-temperature Gilbert damping (α = 4 \times 10^-5) that rivals the intrinsic (bulk) damping otherwise seen only in highly-polished YIG spheres (far more challenging to integrate into arrays). Here, we present a comprehensive and systematic study of the low-temperature magnetization dynamics for V[TCNE]x thin films, with implications for their application in quantum systems. These studies reveal a temperature-driven, strain-dependent magnetic anisotropy that compensates the thin-film shape anisotropy, and the recovery of a magnetic resonance linewidth at 5 K that is comparable to room-temperature values (roughly 2 G at 9.4 GHz). We can account for these variations of the V[TCNE]x linewidth within the context of scattering from very dilute paramagnetic impurities, and anticipate additional linewidth narrowing as the temperature is further reduced.
