Room-Temperature Quantum Coherence and Rabi Oscillations in Vanadyl Phthalocyanine: Toward Multifunctional Molecular Spin Qubits
Room-Temperature Quantum Coherence and Rabi Oscillations in Vanadyl Phthalocyanine: Toward Multifunctional Molecular Spin Qubits
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DOI：
10.1021/jacs.5b13408
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发表时间：
2016-02-24
影响因子：
15
通讯作者：
Sessoli, Roberta
中科院分区：
文献类型：
--
作者：
Atzori, Matteo;Tesi, Lorenzo;Sessoli, Roberta
本文报道了一种多功能、易处理的分子自旋量子比特--酞菁氧钒（VOPc）的磁弛豫和量子相干性的研究。采用交流阻抗法、连续波法和脉冲电子顺磁共振（EPR）法研究了VOPc（1）及其在不同化学计量比（VOPc：TiOPc = 1：10（2）和1：1000（3））的同质结构抗磁性基质TiOPc中的晶体分散。交流磁化率测量显示，线性增加的弛豫速率与温度高达20 K，预期的直接机制，但仍然缓慢在一个非常宽的范围内施加的静态场值（高达类似5 T）。3的脉冲EPR光谱实验揭示了室温下的量子相干性，T-m在300 K时类似于1 μ s，代表了迄今为止分子电子自旋量子位获得的最高值。在室温下，在这种核自旋活性环境（H-1和N-14核）中也观察到拉比振荡，这表明这种分子半导体中的量子相干性具有出色的鲁棒性，可用于自旋电子器件。
Here we report the investigation of the magnetic relaxation and the quantum coherence of vanadyl phthalocyanine, VOPc, a multifunctional and easy-processable potential molecular spin qubit. VOPc in its pure form (1) and its crystalline dispersions in the isostructural diamagnetic host TiOPc in different stoichiometric ratios, namely VOPc:TiOPc 1:10 (2) and 1:1000 (3), were investigated via a multitechnique approach based on the combination of alternate current (AC) susceptometry, continuous wave, and pulsed electron paramagnetic resonance (EPR) spectroscopy. AC susceptibility measurements revealed a linear increase of the relaxation rate with temperature up to 20 K, as expected for a direct mechanism, but a remains slow over a very wide range of applied static field values (up to similar to 5 T). Pulsed EPR spectroscopy experiments on 3 revealed quantum coherence up to room temperature with T-m similar to 1 mu s at 300 K, representing the highest value obtained to date for molecular electronic spin qubits. Rabi oscillations are observed in this nuclear spin-active environment (H-1 and N-14 nuclei) at room temperature also for 2, indicating an outstanding robustness of the quantum coherence in this molecular semiconductor exploitable in spintronic devices.