Pub Date : 2023-11-06DOI: 10.1088/0256-307x/40/12/120501
Abdul-Majid Wazwaz
Abstract We introduce a new Painlevé integrable (3+1)-dimensional combined potential KadomtsevPetviashvili equation with B-type Kadomtsev-Petviashvili equation, that will be called pKP-BKP equation. We perform the Painlevé analysis to emphasize the complete integrability of this newly (3+1)-dimensional combined integrable equation. We formally derive multiple soliton solutions via employing the simplified Hirota’s bilinear method. Moreover, a variety of lump solutions will be determined. We also develop two new (3+1)-dimensional pKP-BKP equations via deleting some terms from the original form of the combined pKP-BKP equation. We emphasize the Painlevé integrability of the newly developed equations, where multiple soliton solutions and lump solutions were derived as well. The derived solutions for all examined models are all depicted through the Maple software.
{"title":"New Painlevé integrable (3+1)-dimensional combined pKP–BKP equation: Lump and multiple soliton solutions","authors":"Abdul-Majid Wazwaz","doi":"10.1088/0256-307x/40/12/120501","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/120501","url":null,"abstract":"Abstract We introduce a new Painlevé integrable (3+1)-dimensional combined potential KadomtsevPetviashvili equation with B-type Kadomtsev-Petviashvili equation, that will be called pKP-BKP equation. We perform the Painlevé analysis to emphasize the complete integrability of this newly (3+1)-dimensional combined integrable equation. We formally derive multiple soliton solutions via employing the simplified Hirota’s bilinear method. Moreover, a variety of lump solutions will be determined. We also develop two new (3+1)-dimensional pKP-BKP equations via deleting some terms from the original form of the combined pKP-BKP equation. We emphasize the Painlevé integrability of the newly developed equations, where multiple soliton solutions and lump solutions were derived as well. The derived solutions for all examined models are all depicted through the Maple software.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135634795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The nonreciprocal effect always emerges in noncentrosymmetric materials for the intrinsic symmetry broken and high conductivity systems for the extrinsic thermoelectric effect. Meanwhile, nonreciprocal charge transport is widely unitized as an effective experimental tool to detect electrical unidirectional intrinsic contribution. Here we show an unconventional nonreciprocal voltage transition in topological insulator Ag 2 Te nanobelts. The nonreciprocal voltage develops from nearly zero to giant values under the applied current I ac and external magnetic fields, while remaining unchanged under various current I dc . This electrical unidirectional contribution is further evidenced by the differential resistance (d V /d I ) measurements. Furthermore, the transition possesses two-dimensional properties under a tilted magnetic field and occurs when the voltage between two electrodes exceeds a certain value. We propose a possible mechanism based on the development of edge channels in Ag 2 Te nanobelts to interpret the phenomenon. Our results not only introduce a peculiar nonreciprocal voltage transition in topological materials but also enrich the understanding of the intrinsic mechanism that strongly affects the nonreciprocal charge transport.
摘要在非中心对称材料中，由于本征对称性破缺和高导电性体系中由于外在热电效应而产生非互易效应。同时，非互易电荷输运被广泛地统一为一种有效的实验工具来检测电的单向本征贡献。在这里，我们展示了拓扑绝缘体ag2te纳米带中非常规的非互易电压转变。在外加电流I交流和外加磁场作用下，非互易电压从接近零发展到巨大值，而在各种电流I直流作用下保持不变。差分电阻(d V /d I)测量进一步证明了这种单向电贡献。此外，在倾斜磁场下，当两个电极之间的电压超过一定值时，这种转变具有二维性质。我们提出了一种基于ag2te纳米带边缘通道发展的可能机制来解释这一现象。我们的研究结果不仅在拓扑材料中引入了一种特殊的非倒易电压跃迁，而且丰富了对强烈影响非倒易电荷输运的内在机制的理解。
{"title":"Unconventional nonreciprocal voltage transition in Ag<sub>2</sub>Te nanobelts","authors":"Peng-Liang Leng, Xiang-Yu Cao, Qiang Ma, Lin-Feng Ai, Yu-Da Zhang, Jing-Lei Zhang, Fa-Xian Xiu","doi":"10.1088/0256-307x/40/12/127201","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/127201","url":null,"abstract":"Abstract The nonreciprocal effect always emerges in noncentrosymmetric materials for the intrinsic symmetry broken and high conductivity systems for the extrinsic thermoelectric effect. Meanwhile, nonreciprocal charge transport is widely unitized as an effective experimental tool to detect electrical unidirectional intrinsic contribution. Here we show an unconventional nonreciprocal voltage transition in topological insulator Ag 2 Te nanobelts. The nonreciprocal voltage develops from nearly zero to giant values under the applied current I ac and external magnetic fields, while remaining unchanged under various current I dc . This electrical unidirectional contribution is further evidenced by the differential resistance (d V /d I ) measurements. Furthermore, the transition possesses two-dimensional properties under a tilted magnetic field and occurs when the voltage between two electrodes exceeds a certain value. We propose a possible mechanism based on the development of edge channels in Ag 2 Te nanobelts to interpret the phenomenon. Our results not only introduce a peculiar nonreciprocal voltage transition in topological materials but also enrich the understanding of the intrinsic mechanism that strongly affects the nonreciprocal charge transport.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"11 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135868937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-03DOI: 10.1088/0256-307x/40/12/124401
Yu Yang, Dengke Ma, Lifa Zhang
Abstract Introducing porosity with different degrees of disorder has been widely used to regulate thermal properties of materials, which generally result in the decrease of thermal conductivity. In this paper, we investigate the thermal conductivity of porous metamaterials in the ballistic transport region through Lorentz gas model. It is found that the introduction of asymmetry and Gaussian disorder into porous metamaterials can lead to a strong enhancement in thermal conductivity. By dividing the transport process into ballistic transport, non-ballistic transport and unsuccessful transport processes, we found that the enhancement in thermal conductivity originates from the significant increase of ratio for ballistic transport. The findings here enhance the understanding of ballistic thermal transport in porous materials and may facilitate the design of high-performance porous thermal metamaterials.
{"title":"Asymmetry enhances thermal transport in porous metamaterials at low temperature","authors":"Yu Yang, Dengke Ma, Lifa Zhang","doi":"10.1088/0256-307x/40/12/124401","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/124401","url":null,"abstract":"Abstract Introducing porosity with different degrees of disorder has been widely used to regulate thermal properties of materials, which generally result in the decrease of thermal conductivity. In this paper, we investigate the thermal conductivity of porous metamaterials in the ballistic transport region through Lorentz gas model. It is found that the introduction of asymmetry and Gaussian disorder into porous metamaterials can lead to a strong enhancement in thermal conductivity. By dividing the transport process into ballistic transport, non-ballistic transport and unsuccessful transport processes, we found that the enhancement in thermal conductivity originates from the significant increase of ratio for ballistic transport. The findings here enhance the understanding of ballistic thermal transport in porous materials and may facilitate the design of high-performance porous thermal metamaterials.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"34 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135868267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-03DOI: 10.1088/0256-307x/40/12/121301
Sen Jia, Weitao Xiong, Chengping Shen
Abstract In the past twenty years, many new hadrons that are difficult to be explained within the conventional quark model have been discovered in the quarkonium region, which are called exotic hadrons. Belle II experiment, as the next-generation B factory, provides a good platform to explore them. The charmonium-like states can be produced at Belle II in several ways, such as B meson decays, initial-state radiation processes, two-photon collisions, and double charmonium productions. The bottomonium-like states can be produced directly in e + e - colliding energies at Belle II with low continuum backgrounds. Belle II plans to perform a high-statistics energy scan from the BB threshold up to the highest possible energy of 11.24 GeV to search for new Y b states with J PC = 1 -- , X b (the bottom counterpart of χ c 1 (3872) (also known as X (3872))), and partners of Z b states. In this paper, we give a mini-review on the status and prospects of exotic hadrons at Belle II.
摘要近二十年来，在夸克区内发现了许多难以用常规夸克模型解释的新强子，这些强子被称为外来强子。Belle II实验作为下一代B工厂，为探索它们提供了一个很好的平台。类夏蒙态可以在Belle II上以几种方式产生，如B介子衰变、初始态辐射过程、双光子碰撞和双夏蒙态产生。类底态可以在低连续背景的Belle II中直接由e + e碰撞能量产生。Belle II计划执行从BB阈值到11.24 GeV的最高可能能量的高统计能量扫描，以搜索jpc = 1—的新Y b状态，X b (χ c 1(3872)(也称为X(3872))的底部对应)，以及Z b状态的伙伴。本文对贝莱II号的外来强子的研究现状和前景作一综述。
{"title":"Status and prospects of exotic hadrons at Belle II","authors":"Sen Jia, Weitao Xiong, Chengping Shen","doi":"10.1088/0256-307x/40/12/121301","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/121301","url":null,"abstract":"Abstract In the past twenty years, many new hadrons that are difficult to be explained within the conventional quark model have been discovered in the quarkonium region, which are called exotic hadrons. Belle II experiment, as the next-generation B factory, provides a good platform to explore them. The charmonium-like states can be produced at Belle II in several ways, such as B meson decays, initial-state radiation processes, two-photon collisions, and double charmonium productions. The bottomonium-like states can be produced directly in e + e - colliding energies at Belle II with low continuum backgrounds. Belle II plans to perform a high-statistics energy scan from the BB threshold up to the highest possible energy of 11.24 GeV to search for new Y b states with J PC = 1 -- , X b (the bottom counterpart of χ c 1 (3872) (also known as X (3872))), and partners of Z b states. In this paper, we give a mini-review on the status and prospects of exotic hadrons at Belle II.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"29 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135868275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Fiber laser is a fundamental component of laser systems and is of great significance for the development of laser technology. Its pulse output can be divided into Q-switched and mode-locked. Achieving ultrashort pulse with narrower pulse duration and higher power is the focus of current research on mode-locked lasers. As an important component of fiber laser systems, saturable absorber (SA) can modulate losses in the optical cavity and generate pulses, enabling the laser system to achieve pulse output under long-term normal operating conditions better. Therefore, expanding the selection range of materials with better saturable absorption properties to improve the quality of pulse output is an important topic in current research. In this paper, the second generation topological insulator Bi 2 Te 3 single crystal is prepared, and a ring fiber laser system is built with the Bi 2 Te 3 SA. The mode-locked pulse with a pulse duration of 288 fs and a signal-to-noise ratio (SNR) of 80.202 dB is realized. This result verifies that Bi 2 Te 3 , as a member of topological insulator, has good saturable absorption characteristics, and has broad prospects for the application research in lasers.
光纤激光器是激光系统的基本组成部分，对激光技术的发展具有重要意义。其脉冲输出可分为调q和锁模两种。实现超短脉冲与窄脉冲持续时间和更高的权力锁模激光器是当前研究的重点。可饱和吸收体(SA)作为光纤激光系统的重要组成部分，可以调制光腔中的损耗并产生脉冲，使激光系统能够在长期正常工作条件下更好地实现脉冲输出。因此，扩大具有较好饱和吸收性能的材料的选择范围，提高脉冲输出质量是当前研究的一个重要课题。本文第二代拓扑绝缘体Bi 2 Te 3单晶准备,和一个环形光纤激光器系统构建与Bi 2 Te 3 SA。实现了脉冲持续时间为288 fs、信噪比为80.202 dB的锁模脉冲。这一结果验证了bi2te3作为拓扑绝缘体的一员，具有良好的饱和吸收特性，在激光器中具有广阔的应用研究前景。
{"title":"Preparation of Bi<sub>2</sub>Te<sub>3</sub> based on saturable absorption system and its application in fiber lasers","authors":"Haoyu Wang, Yue-Jia Xiao, Qi Liu, Xiao-Wei Xing, Hu-Jiang Yang, Wen-Jun Liu","doi":"10.1088/0256-307x/40/11/114204","DOIUrl":"https://doi.org/10.1088/0256-307x/40/11/114204","url":null,"abstract":"Abstract Fiber laser is a fundamental component of laser systems and is of great significance for the development of laser technology. Its pulse output can be divided into Q-switched and mode-locked. Achieving ultrashort pulse with narrower pulse duration and higher power is the focus of current research on mode-locked lasers. As an important component of fiber laser systems, saturable absorber (SA) can modulate losses in the optical cavity and generate pulses, enabling the laser system to achieve pulse output under long-term normal operating conditions better. Therefore, expanding the selection range of materials with better saturable absorption properties to improve the quality of pulse output is an important topic in current research. In this paper, the second generation topological insulator Bi 2 Te 3 single crystal is prepared, and a ring fiber laser system is built with the Bi 2 Te 3 SA. The mode-locked pulse with a pulse duration of 288 fs and a signal-to-noise ratio (SNR) of 80.202 dB is realized. This result verifies that Bi 2 Te 3 , as a member of topological insulator, has good saturable absorption characteristics, and has broad prospects for the application research in lasers.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"19 23","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135973391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1088/0256-307x/40/11/113201
Li Wang, Xiaowei Wang, Fan Xiao, Jiacan Wang, Wenkai Tao, Dongwen Zhang, Zengxiu Zhao
Abstract We show that it is feasible to generate sub-40-attosecond pulses with near-infrared few-cycle pulses centered at 800 nm. With proper gating technique, super-broadband continuum spectrum extending from 50 eV to above 200 eV can be obtained, and the intrinsic atto-chirp can be satisfactorily compensated with C filter, producing isolated attosecond pulses with duration of 33 as. According to the wavelength scaling law of high-order harmonic generation, the proposed scheme is of great significance to develop high-flux ultrashort attosecond sources.
{"title":"Chirp compensation for generating ultrashort attosecond pulses with 800-nm few-cycle pulses","authors":"Li Wang, Xiaowei Wang, Fan Xiao, Jiacan Wang, Wenkai Tao, Dongwen Zhang, Zengxiu Zhao","doi":"10.1088/0256-307x/40/11/113201","DOIUrl":"https://doi.org/10.1088/0256-307x/40/11/113201","url":null,"abstract":"Abstract We show that it is feasible to generate sub-40-attosecond pulses with near-infrared few-cycle pulses centered at 800 nm. With proper gating technique, super-broadband continuum spectrum extending from 50 eV to above 200 eV can be obtained, and the intrinsic atto-chirp can be satisfactorily compensated with C filter, producing isolated attosecond pulses with duration of 33 as. According to the wavelength scaling law of high-order harmonic generation, the proposed scheme is of great significance to develop high-flux ultrashort attosecond sources.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135222025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1088/0256-307x/40/12/124402
Changliang Zhu, Xiangying Shen, Guimei Zhu, Baowen Li
Predicting thermal conductance of complex networks poses a formidable challenge in the field of materials science and engineering. This challenge arises due to the intricate interplay between the parameters of network structure and thermal conductance, encompassing connectivity, network topology, network geometry, node inhomogeneity, and others. Our understanding of how these parameters specifically influence heat transfer performance remains limited. Deep learning offers a promising approach for addressing such complex problems. We find that the well-established convolutional neural network models AlexNet can predict the thermal conductance of complex network efficiently. Our approach further optimizes the calculation efficiency by reducing the image recognition in consideration that the thermal transfer is inherently encoded within the Laplacian matrix. Intriguingly, our findings reveal that adopting a simpler convolutional neural network architecture can achieve a comparable prediction accuracy while requiring less computational time. This result facilitates a more efficient solution for predicting the thermal conductance of complex networks and serves as a reference for machine learning algorithm in related domains.
{"title":"Prediction of Thermal Conductance of Complex Networks with Deep Learning","authors":"Changliang Zhu, Xiangying Shen, Guimei Zhu, Baowen Li","doi":"10.1088/0256-307x/40/12/124402","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/124402","url":null,"abstract":"Predicting thermal conductance of complex networks poses a formidable challenge in the field of materials science and engineering. This challenge arises due to the intricate interplay between the parameters of network structure and thermal conductance, encompassing connectivity, network topology, network geometry, node inhomogeneity, and others. Our understanding of how these parameters specifically influence heat transfer performance remains limited. Deep learning offers a promising approach for addressing such complex problems. We find that the well-established convolutional neural network models AlexNet can predict the thermal conductance of complex network efficiently. Our approach further optimizes the calculation efficiency by reducing the image recognition in consideration that the thermal transfer is inherently encoded within the Laplacian matrix. Intriguingly, our findings reveal that adopting a simpler convolutional neural network architecture can achieve a comparable prediction accuracy while requiring less computational time. This result facilitates a more efficient solution for predicting the thermal conductance of complex networks and serves as a reference for machine learning algorithm in related domains.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"29 4 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138684118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-27DOI: 10.1088/0256-307x/40/12/126301
Yunzhe Tian, Qijing Zheng, Jin Zhao
Abstract Using ab initio nonadiabatic molecular dynamics simulation, we have studied the time-dependent charge transport dynamics in a single-molecule junction formed by gold (Au) electrodes and a single benzene-1,4-dithiol (BDT) molecule. Two different types of charge transport channels are found in the simulation. One is the routine non-resonant charge transfer path, which occurs in several picoseconds. The other is activated when the electronic state of the electrodes and that of the molecule get close in energy, which we refer to as the resonant charge transport. More strikingly, the resonant charge transfer occurs in an ultrafast manner within 100 femtoseconds, which notably increases the conductance of the device. Further analysis shows that the resonant charge transport is directly assisted by the B 2 and A 1 molecular vibration modes. Our study provides atomic insights into the time-dependent charge transport dynamics in single-molecule junctions, which is important for designing highly efficient single-molecule devices.
{"title":"Resonant Charge Transport Assisted by the Molecular Vibration in Single-molecule Junction from Time-domain Ab Initio Nonadiabatic Molecular Dynamics Simulations","authors":"Yunzhe Tian, Qijing Zheng, Jin Zhao","doi":"10.1088/0256-307x/40/12/126301","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/126301","url":null,"abstract":"Abstract Using ab initio nonadiabatic molecular dynamics simulation, we have studied the time-dependent charge transport dynamics in a single-molecule junction formed by gold (Au) electrodes and a single benzene-1,4-dithiol (BDT) molecule. Two different types of charge transport channels are found in the simulation. One is the routine non-resonant charge transfer path, which occurs in several picoseconds. The other is activated when the electronic state of the electrodes and that of the molecule get close in energy, which we refer to as the resonant charge transport. More strikingly, the resonant charge transfer occurs in an ultrafast manner within 100 femtoseconds, which notably increases the conductance of the device. Further analysis shows that the resonant charge transport is directly assisted by the B 2 and A 1 molecular vibration modes. Our study provides atomic insights into the time-dependent charge transport dynamics in single-molecule junctions, which is important for designing highly efficient single-molecule devices.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"39 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136262128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-27DOI: 10.1088/0256-307x/40/11/116301
Rong Qiu, Qiyu Zeng, Han Wang, Dongdong Kang, Xiaoxiang Yu, Jiayu Dai
Abstract Superionic ices with highly mobile protons within the stable oxygen sub-lattice occupy an important proportion of the phase diagram of ice and widely exist in the interior of icy giants and throughout the universe. Understanding the thermal transport in superionic ice is vital for the thermal evolution of icy planets. However, it is highly challenging due to the extreme thermodynamic conditions and dynamical nature of protons, beyond the capability of the traditional lattice dynamics and empirical potential molecular dynamics approaches. In this work, by utilizing the deep potential molecular dynamics approach, we investigate the thermal conductivity of ice-VII and superionic ice-VII” along the isobar of p = 30 GPa. A non-monotonic trend of thermal conductivity with elevated temperature is observed. Through heat flux decomposition and trajectory-based spectra analysis, we show that the thermally-activated proton diffusion in ice-VII and superionic ice-VII” contribute significantly to heat convection, while the broadening in vibrational energy peaks and significant softening of transverse acoustic branches lead to a reduction in heat conduction. The competition between proton diffusion and phonon scattering results in anomalous thermal transport across the superionic transition in ice. This work unravels the important role of proton diffusion in the thermal transport of high-pressure ice. Our approach provides new insights into modeling the thermal transport and atomistic dynamics in superionic materials.
{"title":"Anomalous thermal transport across the superionic transition in ice","authors":"Rong Qiu, Qiyu Zeng, Han Wang, Dongdong Kang, Xiaoxiang Yu, Jiayu Dai","doi":"10.1088/0256-307x/40/11/116301","DOIUrl":"https://doi.org/10.1088/0256-307x/40/11/116301","url":null,"abstract":"Abstract Superionic ices with highly mobile protons within the stable oxygen sub-lattice occupy an important proportion of the phase diagram of ice and widely exist in the interior of icy giants and throughout the universe. Understanding the thermal transport in superionic ice is vital for the thermal evolution of icy planets. However, it is highly challenging due to the extreme thermodynamic conditions and dynamical nature of protons, beyond the capability of the traditional lattice dynamics and empirical potential molecular dynamics approaches. In this work, by utilizing the deep potential molecular dynamics approach, we investigate the thermal conductivity of ice-VII and superionic ice-VII” along the isobar of p = 30 GPa. A non-monotonic trend of thermal conductivity with elevated temperature is observed. Through heat flux decomposition and trajectory-based spectra analysis, we show that the thermally-activated proton diffusion in ice-VII and superionic ice-VII” contribute significantly to heat convection, while the broadening in vibrational energy peaks and significant softening of transverse acoustic branches lead to a reduction in heat conduction. The competition between proton diffusion and phonon scattering results in anomalous thermal transport across the superionic transition in ice. This work unravels the important role of proton diffusion in the thermal transport of high-pressure ice. Our approach provides new insights into modeling the thermal transport and atomistic dynamics in superionic materials.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136262480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-26DOI: 10.1088/0256-307x/40/12/124201
Cai-Ping Zhang, Xiang-Yang Miao
Abstract The harmonic emission from bichromatic periodic potential has been investigated by numerically solving the time-dependent Schrödinger equation in velocity gauge. The results show that the harmonic minimum is sensitive to the wavelength. Moreover, distinct crystal momentum states contribute differently to harmonic generation. In momentum space, the electron dynamics reveals a close relationship between the spectral minimum and the electron distribution in higher conduction bands. Additionally, by introducing an ultraviolet pulse to the fundamental laser field, the suppression of harmonic minimum occurs as a result of heightened electron populations in higher conduction bands. This work can shed light on the harmonic emission originating from solid with a two-atom basis.
{"title":"Modifying the electron dynamics in high-order harmonic generation via two-color laser field","authors":"Cai-Ping Zhang, Xiang-Yang Miao","doi":"10.1088/0256-307x/40/12/124201","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/124201","url":null,"abstract":"Abstract The harmonic emission from bichromatic periodic potential has been investigated by numerically solving the time-dependent Schrödinger equation in velocity gauge. The results show that the harmonic minimum is sensitive to the wavelength. Moreover, distinct crystal momentum states contribute differently to harmonic generation. In momentum space, the electron dynamics reveals a close relationship between the spectral minimum and the electron distribution in higher conduction bands. Additionally, by introducing an ultraviolet pulse to the fundamental laser field, the suppression of harmonic minimum occurs as a result of heightened electron populations in higher conduction bands. This work can shed light on the harmonic emission originating from solid with a two-atom basis.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136381331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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