Quantum Electro-Mechanical Engineering of Nanosystems

机电相互作用在纳米尺度上得到增强，因此力学和电子学之间的界限可以模糊。为了充分利用量子纳米技术，必须同时理解和控制纳米系统的力学（声子、应变、缺陷）和电子学（量子相、筛选、相关性）。我们将在一些最有前途和可调的纳米材料中研究这种电力学的杂交：应变工程石墨烯，单壁碳纳米管（SWCNTs）和单层二硫化钼。我们的方法是独一无二的，因为我们已经开发出适合应变工程的极其清洁和小型晶体管（< 10 - 50纳米）的方法。我们将这些器件应变至10%，同时测量它们在低T和高磁场下的电子谱。我们将探索具有高影响力的基础科学和应用科学：(1)应变晶体管、谷电子学和应变量子霍尔效应；(2)热导率和热功率的应变工程；(3)纳米机电系统（NEMS）中的超强电子-振动耦合。所提出的工作的高影响来自两个事实：我们的样品大约比其他小组研究的大多数超清洁石墨烯/ SWCNT/ MoS2悬浮器件小一个数量级（更强的机电耦合），我们将绘制其电子和热输运图，同时控制其应变和电磁环境。这一独特的探索将使我们能够对NEMS中的e-v耦合进行定量测试，以及电子和热输运的应变工程。例如，利用弹道石墨烯的单轴应变，我们的目标是制造机械控制的量子晶体管。同样，我们希望能够利用应变来控制石墨烯的导热性和二硫化钼的热功率。我们还将使用应变来提高纳米振荡器（NEMS）的频率并减少其能量耗散。这些研究对于利用力学和电子学相结合的量子纳米技术至关重要。我们的目标是建立几个原理验证应用器件：应变晶体管，热晶体管，超高频NEMS和机械量子比特。

Electro-mechanical interactions are enhanced at the nanoscale, such that the boundary between mechanics and electronics can be blurred. To fully exploit quantum nanotechnology, it is essential to understand and control simultaneously the mechanics (phonons, strain, defects) and electronics (quantum phase, screening, correlations) of nanosystems. We will study this hybridization of electro-mechanics in some of the most promising and tunable nanomaterials: strain-engineered graphene, single-wall carbon nanotubes (SWCNTs) and monolayer MoS2. Our approach is unique as we have developed the methods to fabricate extremely clean and small transistors (< 10 - 50 nm) suited for strain-engineering. We will strain these devices up to 10%, while measuring their electronic spectrum at low T and under high magnetic fields. We will explore high-impact fundamental and applied science: (1) Strain transistors, valleytronics and strain-Quantum Hall Effect, (2) Strain engineering of the thermal conductivity and thermopower, (3) Ultra-strong electron-vibron coupling in nano-electromechanical systems (NEMS). The high-impact of the proposed work comes from two facts: our samples are roughly an order of magnitude smaller than most ultra-clean graphene/ SWCNT/ MoS2 suspended devices studied by other groups (stronger electro-mechanical coupling), and we will map out their electronic and thermal transport while controlling simultaneously their strain and electromagnetic environment. This unique exploration will allow us to make quantitative tests of the e-v couplings in NEMS, and strain engineering of electronic and thermal transport. For instance, using a uniaxial strain in ballistic graphene we aim to create mechanically controlled quantum transistors. Similarly, we expect to be able to control the thermal conductivity of graphene and the thermopower of molybdenum-disulfide using strain. We will also use strain to increase the frequency of nano-oscillators (NEMS) and reduce their energy dissipation. These studies are essential to exploit quantum nanotechnology where mechanics and electronics hybridize. We aim to build several proof-of-principle applied devices: strain-transistors, thermal transistors, ultra-high frequency NEMS and mechanical qubits.