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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

Deadline: October 7, 2020
 
With the successful end of 2020 International Conference on Thermodynamics and Thermal Metamaterials (ThermoMeta2020; http://econophysics.fudan.edu.cn/jphuang/ThermoMeta2020), we feel obligated to launch a Special Issue for the topics discussed in ThermoMeta2020, which will be held every two years since 2020. The ThermoMeta2020 has provided interdisciplinary and in-depth discussions among and in various disciplines of physics, engineering thermophysics, and material science. In particular, its aim is to gather scholars from different areas, especially, thermodynamics and statistical physics, heat transfer, and materials thermodynamics, with a special focus on thermal metamaterials from basic researches to industrial applications.
 
Thermal metamaterials mean those materials or devices with artificial structures that can be used to control heat conduction, convection, and radiation in novel manners. In this case, geometric structures (rather than physical properties) play a dominating role. This fact makes thermal metamaterials different from other materials including thermoelectric materials, pyroelectric materials, magnetocaloric materials, and photothermal conversion materials; for the latter, physical properties (rather than geometric structures) play a dominating role instead.
 
Topics covered in this Special Issue include:
 
A. Interdisciplinary research of thermodynamics and statistical physics, heat transfer, and materials thermodynamics: thermal metamaterials and their basic researches, technology developments, engineering applications, industrialization, and commercialization. Topics include, but are not limited to:
(a) Theoretical thermotics: transformation thermotics and extended theories for thermal metamaterials
(b) Controlling heat transfer with metamaterials, such as cloaks, concentrators, rotators, radiative coolers, illusion/camouflage, macroscopic diodes, transparency and thermocrystals
(c) Metathermotics: Thermal effects/responses of metamaterials, such as thermal conduction of vacuum, anti-parity-time symmetry and topology in diffusion, and temperature-dependent thermal conductivities
(d) Nonlinear thermotics: thermal counterpart of nonlinear optics
(e) Metamaterials for thermal energy storage or harvesting, such as ultra-low thermal conductivities
(f) Metamaterials for thermal energy transport or transfer, such as ultra-high or effectively infinite thermal conductivities
(g) Metamaterials for thermal energy conversion, such as thermophotovoltaic systems with high efficiency
(h) Metamaterials for thermal energy utilization or application, such as zero-energy or negative-energy heat preservation
 
B. Other interdisciplinary research of thermodynamics and statistical physics, heat transfer, and materials thermodynamics: theory, computer simulation, and experiment. Topics may come from (but are not limited to) stochastic thermodynamics, quantum thermodynamics, electrocalorics, photothermics, phononics, thermal machines, and modern thermodynamics.
 
We are seeking for researchers to contribute Review or Topical Review. In general, Review is more than 30 pages, and Topical Review is between 15-30 pages.
 
The sample TEX template can be downloaded from http://journal.hep.com.cn/fop/EN/column/column15258.shtml. The manuscript should be submitted through http://cn.manuscriptcentral.com/fop. All submissions will be subjected to peer review. The Special Issue will be open accessed with zero page charge, and a copy of the whole volume will be sent to all the participants via email.
 
Sincerely,
Ji-Ping Huang
Professor, Department of Physics, Fudan University, Shanghai, China
E-mail: jphuang@fudan.edu.cn

Heterojunction is featured with an interface between two different components. Due to their unequal electronic structures, like Fermi energy, band gap, and band edges, charge transfer and interfacial charge separations are often resulted. This offers large space for rational design of advanced heterojunctions towards various applications, such as solar cells, catalysts and transistors. This special topic collects 15 articles on this topic, covering the applications in photocatalysis, solar cells, hydrogen production, hydrogen storage, etc. 


     Dr. Chenghua Sun obtained his PhD (2008) in Materials Science under the co-supervision of Professor Hui-Ming Cheng and Professor Max Lu at Institute of Metal Research, Chinese Academy of Sciences, China. Dr. Sun joined the University of Queensland as a Postdoctoral Fellow in 2007 and got the Faculty Position (Lecturer) in Monash University in 2013. Since 2017, Dr. Sun have been as an Associate Professor at Swinburne University of Technology, Australia. Over the last twenty years, Dr. Sun has been working on Computational Materials.

As a typical post-graphene 2D material, black phosphorus (BP) has attracted tremendous attention since 2014, due to its high carrier mobility, widely tunable direct bandgap and characteristic anisotropic properties. The excellent physical and chemical properties endow BP have promising potential in field effect transistors, optoelectronics, catalysts, batteries, ultrafast photonics, and biomedicine applications. However, as we know, although BP has the best thermodynamic stability among its allotropes, it easily suffers from chemical degradation when it is exposed in air, which results in a rapid loss of its originally excellent electronic/optoelectronic properties. Due to the fascinating properties of BP, studies on modification of BP and its alternatives with both high device performance and stability are gaining great attention.
 
A variety of approaches have been employed to improve the stability of BP, such as fluorination, ligand surface coordination, capping layer protection, and chemical surface functionalization, which can efficiently passivate BP and remarkably enhance the stability of BP for its practical applications.
 
In addition, a new class of materials has emerged in recent years, termed black phosphorus analogues (BPAs), such as tellurium, selenium, bismuth, antimony, tin sulfide, and indium selenide, which share similar folded structures with BP and exhibit tunable bandgap, high carrier mobility, and a high on/off ratio but with excellent environmental stability, suitable for potential practical applications.
 
The challenges in exploring the physicochemical properties of these 2D materials will be addressed in this special issue. Finally, versatile performances for practical applications based on these 2D materials are also welcome to be reviewed.
 
The scope of this focus issue in Frontiers of Physics would cover all of the aspects from experimental synthesis, experimental characterizations (ARPES, STM, optical absorption, Raman spectroscopy, etc.), electronic properties, optical properties, and versatile applications, etc. 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 burgeoning field.
 
Specific materials of interest covered in this issue include
 ●  Modified black phosphorus with high stability
 ●  Tellurene
 ●  Selenium
 ●  Bismuthene
 ●  Antimonene
 ●  Germanene
 ●  Tin sulfide and its analogues
 ●  Indium selenide and its analogues
 ●  Composite materials
 
We are looking for high profile scientists from China and overseas to contribute Review, Topical Review, 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.

Impressive improvements have been made in the performance of organic field effect transistors (OFETs) in the past two decades, thanks to the efforts devoted to organic materials development, device engineering and understanding of device physics. OFETs are based on various small molecules, conjugated oligomers and polymers. The improved device performance and the advantages offered by organic materials such as easy processibility, inherent flexibility, light weight, and biocompatibility have drawn continuous attention from both academic and industry. OFETs have potential application in flexible display backplanes, sensors, memories and RFID tags. Recent advances in flexible OFETs and their applications in biomimetic sensory and nervous systems have aroused great interest in novel products and use cases for the future. The understanding on organic semiconductors, device engineering and device physics will be addressed in this special issue. A variety of functional devices based on OFETs will also be reviewed.
 
The scope of this focus issue in Frontiers of Physics would cover all of the aspects from material design and synthesis, device engineering and integration, device physics and functional devices, etc. 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 areas of interest covered in this issue include but not limited to:
 ●  Design and synthesis of organic semiconductors
 ●  Device engineering and integration
 ●  Device physics, modeling and characterization
 ●  Memories and synaptic transistors
 ●  Phototransistors and organic light emitting transistors
 ●  Sensors and other functional devices
 ●  Organic single-crystal devices

With the fast-developing of human society, the transformation of the nation’s energy consumption towards the renewable energy sources is one of the major challenges for the upcoming decades. Thoughtfully implemented solar energy storage and application technologies can reduce fuel demand, improve energy reliability, provide emergency power in case of interrupted generation, reduce consumer and utility costs, decrease CO2 emissions, and increase the amount of distributed renewable energy into the grid. The field has attracted wide interest because it has an intrinsic interdisciplinary nature, not only limited to physics, but also connected to chemistry, materials science, optics, mechanics, and intimately related to application fields such as device and electrical engineering.
 
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 dedicated to the topic of “Solar Energy Storage and Applications”. The scope of this focus issue in Frontiers of Physics would cover all of the aspects from theoretical, computational, to experimental progress in the field. This special issue will present the major recent progress in this field from the best 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 topics of interest covered in this issue include
 ●  Solar water splitting and CO2 conversion
 ●  Environmental and Synthetic photocatalysis
 ●  Photoelectrochemical conversion and devices
 ●  Molecular and biomimetic photosynthesis
 ●  Photo-induced charge carrier transfer, mechanism and modelling
 ●  Photovoltaic materials and devices
 ●  Energy storage materials, devices and applications
 
We are looking for high profile scientists from China and overseas to contribute Review or View & Perspective 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 tentative published date of the special issue is the Spring of 2019, so we expect that the review articles will be submitted by January 31, 2019. 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://cn.manuscriptcentral.com/fop. All PDFs of the special issue will be openly accessed at http://journal.hep.com.cn/fop, and a copy of the volume will be mailed to all participants.
 
Sincerely,
 
Guest Editors
Min Liu, Central South University, minliu@csu.edu.cn
Haotian Wang, Harvard University, hwang@rowland.harvard.edu

Professor Akito Arima is an internationally renowned scientist, the most treasured and beloved colleague, friend, and teacher to many nuclear physicists worldwide. Many colleagues have learned from him and enjoyed his elegant works on nuclear magnetic moments, the nuclear shell model, clustering structure, and the artful invention (with Franco Iachello) of the interacting Boson model (IBM). Among his numerous contributions, the IBM theory, together with the Mayer-Jensen shell model and the Bohr-Mottelson collective model, are fundamental frameworks in theoretical nuclear structure. These models are often referred to as the shell, geometric, and the algebraic models, respectively. His explanation of the magnetic moments of nuclei with one valence nucleon outside (or one hole in) doubly closed shells in terms of configuration mixings is also a "standard model" of this subject in nuclear structure theory.
 
Professor Akito Arima has made great contributions in training talents. He supervised more than forty doctoral students and dozens of post-doc fellows. Many of them became very active researchers in various branches of nuclear science. He has held very important administrative positions, including the Minister of Education, Culture, Sports, Science and Technology in Japan, the President of the University of Tokyo, the President of RIKEN (Institute of Physical and Chemical Research), the Chairman of the Japan Science Foundation, the Director of the Tokyo Science Museum, the President of the Musashi Gakuen, and so on. He fostered numerous international cooperations between Japan, China, the United States, and many other countries during his career.
 
Professor Akito Arima was awarded the Order of Culture (the highest honor in Japan), Grand Cordon of the Order of the Rising Sun, Prizes of Haiku Society, Honorary Citizen of Tokyo, National Friendship Award (China), Knight Commander of the British Empire (UK), John Price Wetherill Medal (USA), Order Das Grosse Verdienstkreuz (Germany), Orden's Gravenhage (Netherlands), among many other honors as well as dozens of honorary professorships and doctoral degrees from Universities and Institutes overseas.
 
In honor of professor Akito Arima's 88 year-old birthday, an International Symposium on Simplicity, Symmetry, and Beauty of Atomic Nuclei will be held in Shanghai from September 25–28, 2018. Taking advantage of this opportunity, the Editorial Office of the journal Frontiers of Physics, together with main organizers of this Symposium, Jie Meng, Takaharu Otsuka, and Yu-Min Zhao, have invited some famous scientists from China, Europe, Japan, and USA to contribute 13 papers for the present Volume. The Editorial Board of the journal Frontiers of Physics and the organizers of this Symposium would like to present this Volume as our birthday gift to Akito. Thanks to all contributors, symposium attendees, and friends.
 
Happy birthday, Akito!
 

Starting from the discovery of topological insulators in 2004, the field of topological materials has emerged as the frontier of the current research. It has greatly deepened our fundamental understanding of the band theory of materials. A variety of topological phases of matter have been predicted, and a number of such materials along with exotic physical properties have been discovered in experiment. The field has attracted wide interest because it also has an intrinsic interdisciplinary nature, not only limited to condensed matter physics, but also connected to high-energy physics, astrophysics, chemistry, materials science, and intimately related to application fields such as device and electronic engineering. It holds huge promise as building blocks for the next-generation electronics industry, based on the concept of “topological electronics”.
 
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 dedicated to the topic of “Recent Advances in Topological Materials”. The scope of this focus issue in Frontiers of Physics would cover all of the aspects from theoretical, computational, to experimental progress in the field. This special issue will present the major recent progress in this field from the best 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 topics of interest covered in this issue include
 ●  Weyl and Dirac semimetals
 ●  Novel topological semimetals beyond Weyl and Dirac
 ●  Spintronics with topological materials
 ●  Progress on 2D topological insulators
 ●  Dirac superconductor
 ●  Majorana fermions and topological superconductivity
 ●  Transport in topological materials
 ●  Magnetism and topological materials
 ●  High order topological insulators
 ●  Anomalous Hall and magneto-optic effect in topological materials
 ●  Topological states in cold atom systems
 
We are looking for high profile scientists from China and overseas to contribute Review, Mini-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 tentative published date of the special issue is the end of 2018, so we expect that the review articles will be submitted by October 30, 2018. 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://cn.manuscriptcentral.com/fop. All PDFs of the special issue will be openly accessed at http://journal.hep.com.cn/fop, and a copy of the volume will be mailed to all participants.
 
Sincerely,
 
Guest Editors
Yugui Yao, Beijing Institute of Technology, ygyao@bit.edu.cn
Xiangang Wan, Nanjing University, xgwan@nju.edu.cn
Shengyuan A. Yang, Singapore University of Technology and Design, shengyuan_yang@sutd.edu.sg
Hua Chen, Colorado State University, huachen@colostate.edu

In the past decade, since the discovery of graphene by Geim and Novoselov, a tremendous research effort has been devoted to graphene and other two-dimensional materials due to its fascinating properties. The Nobel Prize in Physics for 2010 was awarded to them “for groundbreaking experiments regarding the two-dimensional material graphene”.  Moreover, in recent years, research on graphene has further aroused large interest in other two-dimensional materials. Among these novel materials beyond graphene, its direct cousins, silicene and germanene (the counterparts of silicon and germanium) have earned special focus. Note that the low-energy theory of these materials is described by Dirac fermions as in graphene, and thus the relatively strong spin-orbit interactions are large enough to make materials such as silicene and germanene to be non-trivial topological insulators. Furthermore, studies on monolayer transition-metal di-chalcogenides and layered double transition-metal carbides (MXenes) are also gaining attention.  The challenges in exploring the physical properties of these 2D materials will be addressed in this special issue. 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 (ARPES, STM, optical absorption etc.), electronic properties, optical properties, and also topological properties, etc. 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 cuttingedge field.
 
Specific materials of interest covered in this issue include
 ●  Graphene
 ●  Silicene
 ●  Germanene
 ●  Transition metal di-chalcogenides, in particular molybdenum disulphide,
 ●  Boron nitride
 ●  Double transition-metal carbides and/or nitrides (MXenes)
 ●  Composite materials
 
We are looking for high profile scientists from China and overseas to contribute Review, Mini-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. All PDFs of the special issue will be open accessed, and a copy of the volume will be mailed to all participants.
 
Sincerely,
 
Daria Andreeva, Ulsan National Institute of Science and Technology, South Korea, daria.baeumler@gmail.com, daria@unist.ac.kr
Wencai Ren, Shenyang National Laboratory for Materials Science, Instituteof Metal Research, Chinese Academy of Sciences, wcren@imr.ac.cn
Guangcun Shan, Beihang University, gcshan@buaa.edu.cn
Kostya Novoselov, University of Manchester, UK, Konstantin.Novoselov@manchester.ac.uk