标题： 利用Hanle效应探测单个通信波段InAs(P)/InP量子点中的电子自旋动力学 显示英文标题

标题： Probing electron spin dynamics in single telecom InAs(P)/InP quantum dots using the Hanle effect

摘要： 载流子在量子点（QDs）中被限制的自旋由于其相对较长的自旋弛豫时间，是量子比特的有前途的候选者。 然而，主要由核自旋的超精细相互作用驱动的电子自旋去相位可能会限制它们的相干性。 在这里，我们报告了在单个InAs(P)/InP量子点中首次展示汉勒效应，这些量子点在电信C波段发射，从而实验确定了电子自旋去相位时间。 使用偏振分辨光致发光光谱学，我们识别了激子复合物并确认了负电荷三重态的存在，在准共振激发下表现出圆偏振度（DOCP）为$-36\%$。 通过对汉勒线宽的分析并采用之前报道的电子$g$-因子，我们提取了电子自旋去相位时间为$T_2^{\ast} = 1.59 \pm 0.49~\mathrm{ns}$。 尽管铟的核自旋较大，所获得的$T_2^{\ast}$与基于GaAs的量子点报道的值相当，我们认为这是由于InAs(P)/InP量子点体积更大。 这些发现证实了基于InP的电信量子点在自旋-光子接口中的潜力。 显示英文摘要

摘要： Spins of carriers confined in quantum dots (QDs) are promising candidates for qubits due to their relatively long spin relaxation times. However, the electron spin dephasing, primarily driven by hyperfine interactions with nuclear spins, can limit their coherence. Here, we report the first Hanle effect demonstration in single InAs(P)/InP QDs emitting in the telecom C-band leading to experimental determination of electron spin dephasing time. Using polarization-resolved photoluminescence spectroscopy, we identified excitonic complexes and confirmed the presence of a negatively charged trion, exhibiting a degree of circular polarization (DOCP) of $-36\%$ under quasi--resonant excitation. From the analysis of Hanle linewidth and employing a previously reported value of the electron $g$-factor, we extracted an electron spin dephasing time of $T_2^{\ast} = 1.59 \pm 0.49~\mathrm{ns}$. Despite the large indium nuclear spin, the obtained $T_2^{\ast}$ is comparable to values reported for GaAs-based QDs, which we attribute to the larger volume of the InAs(P)/InP QDs. These findings confirm the potential of InP-based telecom QDs for use in spin-photon interfaces.