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原子级厚度的二维材料是用于光电转换、较有潜力的材料。因为它们具有非常短的光激发载流子扩散路径，进而可以降低光生电子空穴对的复合几率，提高其内部光生载流子的有效分离。原子级厚度的氮化碳作为二维非金属聚合物已被广泛用于光电转换。但是，一般来讲，原子级氮化碳的禁带宽度约为3.06 eV，仅对应太阳光谱中波长小于420 nm的光谱，无法有效利用占太阳光谱约43%的可见光。因此，如何拓展其可见光吸收范围成为...
近年来，第三代半导体材料氧化镓由于其超大的禁带宽度（~4.9 eV）和超高的击穿场强（~8 MV/cm），在深紫外光电器件和高功率器件领域一直受到大家的广泛关注。但是目前实验室制备的氧化镓电子器件性能还远低于其应用需求，主要是由于其较低的载流子迁移率和较强的激子结合能。为了进一步提升氧化镓光电器件的性能，研究者通常通过构建氧化镓/二维材料异质结界面，借助二维材料超高的载流子迁移率和优异的光学吸收来...
由不同性质的二维材料组合堆叠而成的范德华异质结由于其独特的物理化学特性，在太阳能转换领域具有广阔的应用前景。然而，作为范德华异质结载流子难以分离源于界面处存在较大的能垒，这进一步限制他们的实际应用。
清华大学物理系周树云及合作者在《Nature Reviews Physics》上发表量子材料光诱导新奇物理效应综述文章（图）
脉冲激光激发 量子材料光诱导 瞬态电子结构 弗洛凯工程
2022/4/22
在二维材料和拓扑材料等量子材料的研究中，光和物质的相互作用起着重要的作用。它不仅是研究材料处于平衡态时的物理特性的重要探测手段，更为重要的是，脉冲激光激发还可以作为一种物态调控新手段。利用光激发可诱导或“衍生”出平衡态所不具有的新奇物态，进而在超快（皮秒甚至飞秒）时间尺度上实现量子材料的物性调控。近期，清华大学物理系周树云教授及合作者受邀在《Nature Reviews Physics》上撰写量子...
FULL-PHYSICS INVERSE LEARNING MACHINE FOR SATELLITE REMOTE SENSING OF OZONE PROFILE SHAPES AND TROPOSPHERIC COLUMNS
Atmospheric composition measurements Satellite remote sensing Machine learning Ozone UV spectroscopy
2018/5/16
Characterizing vertical distributions of ozone from nadir-viewing satellite measurements is known to be challenging, particularly the ozone information in the troposphere. A novel retrieval algorithm ...
Post-quantum cryptography---dealing with the fallout of physics success
public-key cryptography post-quantum cryptography
2017/4/17
Post-quantum cryptography is cryptography under the assumption that the attacker has a large quantum computer; post-quantum cryptosystems strive to remain secure even in this scenario. This relatively...
I contrast two possible attitudes towards a given branch of physics: as inferential (i.e., as concerned with an agent's ability to make predictions given finite information), and as dynamical (i.e., a...
Probability in physics:stochastic,statistical,quantum
quantum mechanics statistical mechanics stochastic dynamics probability objective chance
2016/6/15
I review the role of probability in contemporary physics and the origin of probabilistic time asymmetry, beginning with the pre-quantum case (both stochastic mechanics and classical statistical mechan...
I show that Aristotelian physics is a correct approximation of Newtonian physics in its appropriate domain, in the same precise sense in which Newton theory is an approximation of Einstein's theory. A...
Theory Reduction in Physics:A Model-Based,Dynamical Systems Approach
reduction theory reduction physics dynamical system emergence intertheory relations inter-theory relations Nagel limit
2016/6/15
In 1973, Nickles identified two senses in which the term `reduction' is used to describe the relationship between physical theories: namely, the sense based on Nagel's seminal account of reduction in ...
Priority and Particle Physics:Ontic Structural Realism as a Fundamentality Thesis
structural realism fundamentality particle physics
2016/6/15
In this article, I address concerns that the ontological priority claims definitive of ontic structural realism are as they stand unclear, and I do so by placing these claims on a more rigorous formal...
Does cosmological expansion affect local physics?
Cosmology General Relativity Black Holes
2016/6/13
In this contribution I wish to address the question whether, and how, the global cosmological expansion influences local physics, like particle orbits and black hole geometries. Regarding the former I...
Unsharp Humean Chances in Statistical Physics:A Reply to Beisbart
Best System Analysis Chance Unsharp Probability Statistical Mechanics
2016/6/13
In an illuminating article, Claus Beisbart argues that the recently-popular thesis that the probabilities of statistical mechanics (SM) are Best System chances runs into a serious obstacle: there is n...
Physics and intrinsic properties
classical mechanics quantum mechanics gravitational mass dispositions Bell's theorem Bohmian mechanics
2016/6/13
The paper sketches out an ontology of physics in terms of matter being primitive stuff distributed in space and all the properties physics is committed to being dispositions that fix the temporal deve...
The reality of relations:the case from quantum physics
Newtonian mechanics quantum mechanics Bell's theorem ontic structural realism particles intrinsic properties dispositions relations structures Bohmian mechanics
2016/6/13
As far as classical physics is concerned, it is possible to trace causal relations between physical objects (i.e. particles in this case) back to intrinsic properties of these objects (such as their m...