报告介绍 Abstract:　　Parity-time (PT) symmetry is a fundamental notion in quantum field theories and opens a new paradigm of non-Hermitian Hamiltonians ranging from quantum mechanics, electronics, to optics and photonics. By carefully exploiting the interplay between optical gain and loss in the complex dielectric permittivity plane, optics has become an ideal platform to study the fundamentals of PT symmet...

报告介绍 Abstract: 　　It is well known that radiation pressure forces of light can be used for the manipulation of mechanical motion in microscopic systems. Notable examples include laser cooling and laser tweezers. In this talk, I will discuss recent experimental advances on the use of radiation pressure force to control mechanical motion in macroscopic systems, with a focus on potential applications in qu...

报告介绍 Abstract： 　　Spin-orbit coupling is ubiquitous in quantum dot quantum computing architectures, and makes spin qubits susceptible to charge noise. We derive a Hamiltonian describing the effect of spin-orbit and noise on a single-spin qubit in a quantum dot. Relaxation is due to noise coupling different orbital levels and is dominated by screened whole charge defects near the dot. Dephasing stems fr...

报告介绍 Abstract　　Non-specific protein adsorption from complex biological media, especially from blood plasma, is an urgent challenge for the application of nanoparticles as delivery systems, diagnostics and other biomedical applications. The surface modification of nanoparticles by physically anchoring hydrophilic biocompatible polymers (A), by coating the NPs core with polymer brush layers with well-con...

报告介绍 报告摘要： 　　Current medical imaging modalities rely on differences in tissue properties rather than on chemical-content changes deep inside the body. Consequently, a biopsy is routinely needed for ultimate diagnosis of a malignancy. Thus, we need noninvasive imaging technologies that can be used in vivo and can determine in real time the chemical content of deep-tissue. Vibrational spectroscopy h...

报告介绍 报告摘要： 　　Semiconductor nano devices whose operation derives from the bound states of individual dopants have received considerable attention because of the promise for new functionalities in quantum electronics. Silicon offers a particularly interesting platform for single dopants because when isotopically purified, silicon acts as a “semiconductor vacuum” for spin, giving it extra...

报告介绍 报告摘要： Semiconductor nano devices whose operation derives from the bound states of individual dopants have received considerable attention because of the promise for new functionalities in quantum electronics. Silicon offers a particularly interesting platform for single dopants because when isotopically purified, silicon acts as a “semiconductor vacuum” for spin, giving it extraordi...

报告介绍 报告摘要：  Ferromagnetism in non-magnetic materials has attracted much attention. Many studies have been carried out to identify the origin of the unexpected ferromagnetism, and to explore potential applications of such materials. Following successful prediction of room temperature ferromagnetism in III-V and II-VI semiconductors doped with 2p light elements, we recently extended the same stra...

报告介绍 Abstract: 　　(I) Calibration of Interaction Energy between Bose and Fermi Superfluids. (arXiv: 1409.0282). In this job we study the interaction energy in a mixture of Bose and Fermi superfluids realized in recent cold atom experiment. On the Bose-Einstein-condensate (BEC) side of a Feshbach resonance between fermionic atoms, this interaction energy can be directly related to the scattering length b...

报告介绍 报告摘要： Transition-metal oxides usually have charge-spin-orbital degrees of freedom and display rich properties. In this talk, using a simple spin-orbital level diagram and density functional calculations, we will discuss a spin-orbital state driven metal-insulator transition and magnetic transition in layered cobaltates and nickelates [1]. We will also study the role of spin-orbit coupling in af...

报告介绍 报告摘要：　　量子光力学领域(Quantum Optomechanics)在最近几年取得了令人瞩目的发展，并形成了多个研究方向。我们在2008年提出并开始系统性的研究如何用激光光镊来束缚和冷却微纳粒子到质心运动的量子基态，并制作一个达到量子极限的微小探测器。利用这个系统,我们研究了悬浮在空气中的玻璃球的布朗运动，并首次测量了布朗运动粒子的瞬时速度，完成了这个爱因斯坦在1907年认为是无法完成的任务。在真空中，我们利用反馈冷却，已经...

报告介绍 Abstract:　　It is well-known that water configuration and behaviors are highly affected by the surface. On the other hand, water is generally considered to have negligible effects on the solid surface. But it might not be the case. Here, we theoretically present two examples to show water could significantly affect the surface structure and properties. The water molecule adsorption could induce the...

报告介绍 报告摘要： Pressure is a popular “extreme” condition in the Universe in that most of entity materials such as the planets are at high pressures. High pressure plays significant role in shaping quantum states of emergent phenomena since pressure can modify spin, charge or orbital states of given compound, while pressure in combination with temperature opens up new avenues toward quantum m...

报告介绍 报告摘要： Since its discovery in 2004, the quasi two-dimensional electron gas (q2DEG) at the LaAlO3/SrTiO3 heterointerface has been a paradigm system in studying the emergent phenomena at the oxide interface. Here, I present two unusual ways to tune the q2DEG from LaAlO3 surface, which are intriguing in that surface modification remotely toggles a proximate interface. First, the q2DEG can be locall...

报告介绍 Abstract:　　Transition-state theory (TST) plays a central role in chemistry. It is a classical theory that states that the rate of a direct reaction can be  pproximated by the instantaneous flux through a dividing surface. This leads to the familiar picture of a reaction rate being dominated by a free-energy bottleneck which gives rise to an Arrhenius temperature-dependence. Various attempts h...

报告介绍 报告摘要： Solar cells that can be manufactured by solution based deposition techniques have potential to be low cost photovoltaic technologies. They can be made by continuous coating or printing techniques and possibly on flexible polymer substrates as well. Since the discovery of dye sensitised solar cells over twenty years ago, a number of efficient solar cell systems have been developed with sol...