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Editors: Tianyou Zhai, Xing Zhou
The isolation of graphene in 2004, rapidly followed by the discovery of its amazing properties, has generated an intense research effort on two-dimensional (2D) materials in the past decade. In 2D materials, the atoms forming the compound are arranged into planes (layers) that are held together by strong in-plane bonds, usually covalent. To form a 3D crystal, the atomic layers are stacked in the out-of plane direction with weak van der Waals interactions. This allows the exfoliation of bulk crystals and the fabrication of thinner flakes, even down to the single layer limit. Such a unique structural feature of 2D materials endows them with various unconventional optoelectronic properties as compared to their bulk, zero-dimensional (0D) and one-dimensional (1D) counterparts. Due to the atomically thin layered structure, 2D materials are likely to have the greatest impact on geometric scaling for dimension downscaling in modern electronics and optoelectronics. For example, the high carrier mobility, tunable polarity of carriers, high light-absorption efficiency, and tunable bandgaps enable 2D materials suitable for next-generation transistors, memories, diodes, photodetectors, photovoltaics, and so on. Furthermore, the strong light-matter interaction and excitons with long lifetime provides unparalleled control over device
properties and possibly new physical phenomena. The challenges in exploring the optoelectronic properties of 2D materials will be addressed in this special topic. Finally, a variety of potential applications based on these 2D materials will also be reviewed.

The scope of this focus issue in Frontiers of Physics would cover all of the aspects from experimental synthesis, experimental characterizations, electronic properties, optical properties, etc. This special topic will present the major recent progress in this field from the best experimental and theoretical teams all over the world. We do hope that it will form a broad overview of the current state of this cutting edge field.

Specific materials of interest covered in this special topic include:
Fabrication of 2D materials or their heterostructures
● Transistors
Memories
Photodetectors
Optics

We are looking for high profile scientists from China and overseas to contribute Review, Topical Review, Perspective, or Research Article in the foresaid areas. Please feel free to choose a striking topic that best fits the issue. Co-authorship is welcome. There is no strict length limit for each article, and for each review at least 15 pages length is highly expected.

 
The sample article (TEX template) can be downloaded via http://journal.hep.com.cn/fop/EN/column/column15258.shtml and the new manuscript can be submitted online through http://mc.manuscriptcentral.com/fop. A copy of the volume will be mailed to all participants.
 
Sincerely,
 
Tianyou Zhai
Huazhong University of Science and Technology, Wuhan, China
E-mail: zhaity@hust.edu.cn

Xing Zhou
Huazhong University of Science and Technology, Wuhan, China
E-mail: zhoux0903@hust.edu.cn

Editors: Lin Wang & Xiaolong Chen
Two-dimensional (2D) materials, with high quality crystalline structure at atomically-thin thickness, show outstanding electronic, optical, optoelectronic and magnetic properties. In recent years, breakthroughs have been achieved in every aspects of 2D-material research. In electronics, channel length of 2D-material transistors has been successfully scaled down to sub-1 nm with high performance. In optoelectronics, intelligent photodetection in twisted bilayer graphene and valley photocurrent in transition metal di-chalcogenides have been demonstrated. In magnetics, the discovery and controlling of long-range magnetism in 2D magnetic materials has renewed the understanding of magnetics. Further investigation on novel 2D materials and devices will promote the development of 2D materials and sustain the high impact of 2D materials to science and technology communities.

The scope of this focus issue in Frontiers of Physics will cover all of the aspects from theory calculations, material synthesis, physical property characterizations (electronic, optical, optoelectronic, mechanical, magnetic properties, etc.), and devices and applications. This special issue will present the major recent progress in this field from the best experimental and theoretical teams all over the world. We do hope that the issue will form a broad overview of the current state of this cutting edge field.
 
Specific materials of interest covered in this issue include
 ● 2D semimetals and metals, such as graphene and WTe2;
 ● 2D semiconductors, such as Transition metal di-chalcogenides, black phosphorus, and layered perovskite;
 ● 2D insulators, such as boron nitride;
 ● 2D topological insulators and superconductors.

We are looking for scientists from China and overseas to contribute Review, Topical Review, Report, View & Perspective, or Research Article in the foresaid areas. Please feel free to choose a striking topic that best fits the issue. Co-authorship is welcome. There is no strict length limit for each article, and for each review at least 15 pages length is highly expected. 
 
The sample article (TEX template) can be downloaded via http://journal.hep.com.cn/fop/EN/column/column15258.shtml and the new manuscript can be submitted online through http://mc.manuscriptcentral.com/fop. A copy of the volume will be mailed to all participants.
 
Sincerely,
 
Lin Wang
Nanjing Tech University, Nanjing, China
E-mail: iamlwang@njtech.edu.cn

Xiaolong Chen
Southern University of Science and Technology, Shenzhen, China
E-mail: chenxl@sustech.edu.cn
Editors: Qing Huang, Ju Han Lee & Guangcun Shan
As a typical post-graphene 2D material, MXene has attracted tremendous attention since 2011.  MXenes are a class of two-dimensional inorganic compound, comprising of a few-atoms-thick layer of transition metal carbides, nitrides or carbonitrides. MXenes combine metallic conductivity of transition metal carbides and hydrophilic properties that occur as a result of their hydroxyl or oxygen terminated surfaces. Given the material properties of MXenes, there are numerous promising applications that are beginning to be realized, which include supercapacitors, lithium and sodium-ion batteries, composite materials, sensors, and optoelectronic/photonic devices. 
 
In view of these developments, we, together with the editorial office of the journal "Frontiers of Physics", have decided that it is timely to edit a special topic of this journal, dedicated to the topic of "MXene and Its Applications". The special topic will mainly feature review and topical review articles that could provide a comprehensive overview of both the current status of the field and the future direction of it as well as several important original research papers, providing an overview of the research and development in the field.
 
We are looking for high profile scientists from China and overseas to contribute Review or Topical Review in the foresaid areas. Please feel free to choose the title and adjust the content that best fits the special topic. Co-authorship is welcome. There is no strict length limit for each article, and for each review at least 15 pages length is highly expected.
 
The sample article (TEX template) can be downloaded via http://journal.hep.com.cn/fop/EN/column/column15258.shtml and the new manuscript can be submitted online through http://mc.manuscriptcentral.com/fop. All PDFs of the special topic will be open accessed, and a copy of the volume will be mailed to all participants.
 
Sincerely,
Guest Editors:

Qing Huang, Ningbo Institute of Materials Technology and Engineering (NIMTE), CAS, E-mail: huangqing@nimte.ac.cn;
Ju Han Lee, University of Seoul, E-mail: jhl@uos.ac.kr
Guangcun Shan, Beihang University, E-mail: gcshan@buaa.edu.cn 
Here are 12 newly selected papers published in Frontiers of Physics during the year 2018-2019, covering the research areas of atomic, molecular and optical physics, condensed matter and material Physics, particle and nuclear Physics, and astrophysics. These papers are awarded the 2020 Outstanding Papers. Thanks for all authors and reviewers!
Thanks to the successful attendance of APTQS 2020, the meeting in this year will be an unforgettable special event in the APTQS history. Trapped quantum systems in AMO physics, including atoms, ion, Rydberg atoms, molecules, hybrid systems, etc., have entered a decade of rapid and unprecedented development. The new experimental platforms, together with the theoretical advances, have significantly advanced our understanding on many aspects of quantum system in trapped environment. New directions in controlling and utilizing these systems outside the traditional methods, such as topological operation, non-Hermitian control, and hybrid systems, are expected to come to fruition in this decade, which would revolutionize the field.
 
In view of these developments, we, together with the editorial office of the journal "Frontiers of Physics", have decided that it is timely to edit a special issue of this journal, dedicated to the topic of "Trapped Atoms and Ions for Quantum Science". We plan to invite a list of speakers to write review, topical review or research articles on this topic. There is no strict page limit for each article, but we expect that it is at least 15 pages long.
 
Thank you very much for your kind help in advance.
 
Best Regards,
APTQS 2020 Committee
Le Luo (Sun Yat-Sen U., Frontiers of Physics Division Editor), luole5@mail.sysu.edu.cn
Kenji Toyoda (Osaka U.), toyoda@qiqb.otri.osaka-u.ac.jp
Kihwan Kim (Tsinghua U.), kimkihwan@mail.tsinghua.edu.cn
Jaewook Ahn (KAIST), jwahn@kaist.ac.kr
Dzmitry Matsukevich (NUS), phymd@nus.edu.sg