Dispersively Detected Pauli Spin-Blockade in a Silicon Nanowire Field-Effect Transistor
Dispersively Detected Pauli Spin-Blockade in a Silicon Nanowire Field-Effect Transistor
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DOI：
10.1021/acs.nanolett.5b01306
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发表时间：
2015-07-01
期刊：
影响因子：
10.8
通讯作者：
Gonzalez-Zalba, M. F.
中科院分区：
文献类型：
--
作者：
Betz, A. C.;Wacquez, R.;Gonzalez-Zalba, M. F.
我们报道了在硅纳米线场效应晶体管的角态处形成的双量子点的自旋态的色散读出。两个面对面的顶栅电极使我们能够独立地将量子点系统的电荷占据调整到电子数限制。我们测量的电荷稳定性的双量子点在直流传输，以及分散通过原位栅极为基础的射频反射，其中一个顶栅电极连接到一个谐振器。后者消除了量子计算架构中对外部电荷传感器的需求，并提供了一种紧凑的方式来读出点间电荷跃迁期间量子电容变化引起的色散位移。在这里，我们观察到泡利自旋封锁的电路在单重态和三重态之间的有限磁场的高频响应。当点内三重态成为基态构型时，在较高的磁场下封锁被解除。色散相移的线形分析进一步揭示了145 μ eV的点内谷轨道分裂Δ（v0）。我们的研究结果开辟了可能性，操作紧凑的互补金属氧化物半导体（CMOS）技术作为一个单重态-三重态量子比特，并使分裂栅硅纳米线架构的自旋动力学研究的理想候选人。
We report the dispersive readout of the spin state of a double quantum dot formed at the corner states of a silicon nanowire field-effect transistor. Two face-to-face top-gate electrodes allow us to independently tune the charge occupation of the quantum dot system down to the few-electron limit. We measure the charge stability of the double quantum dot in DC transport as well as dispersively via in situ gate-based radio frequency reflectometry, where one top-gate electrode is connected to a resonator. The latter removes the need for external charge sensors in quantum computing architectures and provides a compact way to readout the dispersive shift caused by changes in the quantum capacitance during inter-dot charge transitions. Here, we observe Pauli spin-blockade in the high-frequency response of the circuit at finite magnetic fields between singlet and triplet states. The blockade is lifted at higher magnetic fields when intra-dot triplet states become the ground state configuration. A line shape analysis of the dispersive phase shift reveals furthermore an intra-dot valley-orbit splitting Delta(v0) of 145 mu eV. Our results open up the possibility to operate compact complementary metal-oxide semiconductor (CMOS) technology as a singlet-triplet qubit and make split-gate silicon nanowire architectures an ideal candidate for the study of spin dynamics.