Mechanical and optical nanodevices in single-crystal quartz

Electrode configuration and electrical dissipation of mechanical energy in quartz crystal resonators

Mechanical resonators made with monolithic piezoelectric quartz crystals are promising for studying new physical phenomena. High mechanical quality factors ($Q$) exhibited by the mm-sized quartz resonators make them ideal for studying weak couplings or long timescales in the quantum regime. However, energy losses through mechanical supports pose a serious limiting factor for obtaining high quality factors. Here we investigate how the $Q$ of quartz resonators at deep cryogenic temperatures can be limited by several types of losses related to anchoring. We first introduce means to reduce the mec…

原子力显微镜中石英音叉力传感器力梯度引起的机械耗散

Force-gradient-induced mechanical dissipation of quartz tuning fork force sensors used in atomic force microscopy

我们研究了用于原子力显微镜的石英音叉谐振器的动力学，考虑到通过音叉基座的附着的机械能耗散。我们发现，音叉谐振器的品质因数的变化，即使是一个纯粹的弹性传感器样品相互作用的情况下。这是由于由传感器-样本力梯度引起的音叉叉尖的有效机械不平衡，这进而对通过谐振器基座的附接的耗散产生影响。该效应可以产生测量的耗散信号，该测量的耗散信号可以不同于仅与传感器和样品之间的耗散相关的信号。我们还发现，有一个二阶项，除了传感器-样品力梯度和音叉的共振频率偏移之间的线性关系，这是显着的，即使是在几十N/m的范围内的力梯度通常存在于原子力显微镜。

Quartz-superconductor quantum electromechanical system

We propose and analyse a quantum electromechanical system composed of a monolithic quartz bulk acoustic wave (BAW) oscillator coupled to a superconducting transmon qubit via an intermediate LC electrical circuit. Monolithic quartz oscillators offer unprecedentedly high effective masses and quality factors for the investigation of mechanical oscillators in the quantum regime. Ground-state cooling of such mechanical modes via resonant piezoelectric coupling to an LC circuit, which is itself sideband cooled via coupling to a transmon qubit, is shown to be feasible. The fluorescence spectrum of th…

门控半导体纳米器件中重空穴自旋量子比特的自旋轨道调控

Spin Orbit Mediated Manipulation of Heavy Hole Spin Qubit in Gated Semiconductor Nanodevices

提出了一种新的自旋电子学纳米器件，它能够以相干的方式操纵单个重空穴自旋态。它可以充当单个量子逻辑门。重空穴自旋转换是通过在纳米器件顶部沉积的金属栅极所限定的闭环周围传输空穴来实现的。该设备利用Dresselhaus自旋轨道相互作用，将空穴的空间运动转化为自旋的旋转。所提出的量子门在亚纳秒时间尺度上操作，并且仅需要施加弱静态电压，这允许单独寻址重空穴自旋量子比特。我们的研究结果得到了四带Luttinger-Kohn模型的量子力学含时计算的支持。

石英音叉谐振器的统一理论

Unified Theory of Quartz Tuning Fork Resonators

本文提出一个统一连续电弹性框架，结合压电电动力学、变分结构动力学和对称性选择的机电可观测性，定量解释了石英音叉谐振器的电学测量谱。

Mass measurement of graphene using quartz crystal microbalances

Current wafer-scale fabrication methods for graphene-based electronics and sensors involve the transfer of single-layer graphene by a support polymer. This often leaves some polymer residue on the graphene, which can strongly impact its electronic, thermal, and mechanical resonance properties. To assess the cleanliness of graphene fabrication methods, it is thus of considerable interest to quantify the amount of contamination on top of the graphene. Here, we present a methodology for direct measurement of the mass of the graphene sheet using quartz crystal microbalances (QCM). By monitoring th…