322 research outputs found
Room-Temperature Structures of Solid Hydrogen at High Pressures
By employing first-principles metadynamics simulations, we explore the 300 K
structures of solid hydrogen over the pressure range 150-300 GPa. At 200 GPa,
we find the ambient-pressure disordered hexagonal close-packed (hcp) phase
transited into an insulating partially ordered hcp phase (po-hcp), a mixture of
ordered graphene-like H2 layers and the other layers of weakly coupled,
disordered H2 molecules. Within this phase, hydrogen remains in paired states
with creation of shorter intra-molecular bonds, which are responsible for the
very high experimental Raman peak above 4000 cm-1. At 275 GPa, our simulations
predicted a transformation from po-hcp into the ordered molecular metallic Cmca
phase (4 molecules/cell) that was previously proposed to be stable only above
400 GPa. Gibbs free energy calculations at 300 K confirmed the energetic
stabilities of the po-hcp and metallic Cmca phases over all known structures at
220-242 GPa and >242 GPa, respectively. Our simulations highlighted the major
role played by temperature in tuning the phase stabilities and provided
theoretical support for claimed metallization of solid hydrogen below 300 GPa
at 300 K.Comment: Accepted in Journal of Chemical Physic
Atomically phase-matched second-harmonic generation in a 2D crystal.
Second-harmonic generation (SHG) has found extensive applications from hand-held laser pointers to spectroscopic and microscopic techniques. Recently, some cleavable van der Waals (vdW) crystals have shown SHG arising from a single atomic layer, where the SH light elucidated important information such as the grain boundaries and electronic structure in these ultra-thin materials. However, despite the inversion asymmetry of the single layer, the typical crystal stacking restores inversion symmetry for even numbers of layers leading to an oscillatory SH response, drastically reducing the applicability of vdW crystals such as molybdenum disulfide (MoS2). Here, we probe the SHG generated from the noncentrosymmetric 3R crystal phase of MoS2. We experimentally observed quadratic dependence of second-harmonic intensity on layer number as a result of atomically phase-matched nonlinear dipoles in layers of the 3R crystal that constructively interfere. By studying the layer evolution of the A and B excitonic transitions in 3R-MoS2 using SHG spectroscopy, we also found distinct electronic structure differences arising from the crystal structure and the dramatic effect of symmetry and layer stacking on the nonlinear properties of these atomic crystals. The constructive nature of the SHG in this 2D crystal provides a platform to reliably develop atomically flat and controllably thin nonlinear media
DP-Image: Differential Privacy for Image Data in Feature Space
The excessive use of images in social networks, government databases, and
industrial applications has posed great privacy risks and raised serious
concerns from the public. Even though differential privacy (DP) is a widely
accepted criterion that can provide a provable privacy guarantee, the
application of DP on unstructured data such as images is not trivial due to the
lack of a clear qualification on the meaningful difference between any two
images. In this paper, for the first time, we introduce a novel notion of
image-aware differential privacy, referred to as DP-image, that can protect
user's personal information in images, from both human and AI adversaries. The
DP-Image definition is formulated as an extended version of traditional
differential privacy, considering the distance measurements between feature
space vectors of images. Then we propose a mechanism to achieve DP-Image by
adding noise to an image feature vector. Finally, we conduct experiments with a
case study on face image privacy. Our results show that the proposed DP-Image
method provides excellent DP protection on images, with a controllable
distortion to faces
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