Controlling collective electronic states holds great promise for the development of innovative devices. Here, we experimentally detect the modification of the charge density wave (CDW) phase transition within a 1T-TaS2 layer in a WS2/1T-TaS2 heterostructure using time-resolved ultrafast spectroscopy. Laser-induced charge transfer doping strongly suppresses the commensurate CDW (CCDW) phase, which results in a significant decrease in both the phase transition temperature (T c) and phase transition stiffness (PTS). We interpret that photo-induced hole doping, when surpassing a critical threshold value of ~1018/cm3, sharply decreases the phase transition energy barrier. Our results provide new insights into controlling the CDW phase transition, paving the way for optical-controlled novel devices based on CDW materials.
{"title":"Photodoping-modified charge density wave phase transition in WS2/1T-TaS2 heterostructure","authors":"Rui Wang, Jianwei Ding, Fei Sun, Jimin Zhao, Xiaohui Qiu","doi":"10.1088/0256-307x/41/5/057801","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/057801","url":null,"abstract":"\u0000 Controlling collective electronic states holds great promise for the development of innovative devices. Here, we experimentally detect the modification of the charge density wave (CDW) phase transition within a 1T-TaS2 layer in a WS2/1T-TaS2 heterostructure using time-resolved ultrafast spectroscopy. Laser-induced charge transfer doping strongly suppresses the commensurate CDW (CCDW) phase, which results in a significant decrease in both the phase transition temperature (T\u0000 c) and phase transition stiffness (PTS). We interpret that photo-induced hole doping, when surpassing a critical threshold value of ~1018/cm3, sharply decreases the phase transition energy barrier. Our results provide new insights into controlling the CDW phase transition, paving the way for optical-controlled novel devices based on CDW materials.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140671453","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 : 2024-04-23DOI: 10.1088/0256-307x/41/5/054201
Zipeng Xu, Xuan Wang, Chuan-Fei Yao, Lin-Jing Yang, Ping-Xue Li
An all-fiber polarization maintaining high-power laser system operating at 1.7 µm based on the Raman-induced soliton self-frequency shifting effect is demonstrated. The entirely fiberized system is built by erbium-doped oscillator and two-stage amplifiers with polarization maintaining commercial silica fibers and devices, which can provide robust and stable soliton generation. High power soliton laser with the average of 0.28 W, the repetition rate of 42.7 MHz, and pulse duration of 515 fs is generated directly from the main amplifier. Our experiment provides a feasible method for high-power all-fiber polarization maintaining femtosecond laser generation working at 1.7 μm.
{"title":"High power Raman soliton generation at 1.7 µm in all-fiber polarization-maintaining erbium-doped amplifier","authors":"Zipeng Xu, Xuan Wang, Chuan-Fei Yao, Lin-Jing Yang, Ping-Xue Li","doi":"10.1088/0256-307x/41/5/054201","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/054201","url":null,"abstract":"\u0000 An all-fiber polarization maintaining high-power laser system operating at 1.7 µm based on the Raman-induced soliton self-frequency shifting effect is demonstrated. The entirely fiberized system is built by erbium-doped oscillator and two-stage amplifiers with polarization maintaining commercial silica fibers and devices, which can provide robust and stable soliton generation. High power soliton laser with the average of 0.28 W, the repetition rate of 42.7 MHz, and pulse duration of 515 fs is generated directly from the main amplifier. Our experiment provides a feasible method for high-power all-fiber polarization maintaining femtosecond laser generation working at 1.7 μm.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140666924","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}
Compared with conventional solid-state electrolytes, halide solid-state electrolytes have several advantages such as a wider electrochemical window, better compatibility with oxide cathode materials, improved air stability, and easier preparation conditions making them conductive to industrial production. We focused on a typical halide solid-state electrolyte, Li3InCl6 and predicted the most stable structure after doping with Br, F, and Ga by using the Alloy Theoretic Automated Toolkit based on first-principles calculations, and verified the accuracy of the prediction model. To investigate the potential of three equivalently doped ground state configurations of Li3InCl6 as solidstate electrolytes for all-solid-state lithium-ion batteries, their specific properties such as crystal structure, band gap, convex packing energy, electrochemical stability window, and lithium-ion conductivity were computationally analyzed using first-principles calculations. After a comprehensive evaluation, it was determined that the F-doped ground state configuration Li3InCl2.5F3.5 exhibits better thermal stability, wider electrochemical stability window, and better lithium ion conductivity (1.80 mS cm-1 at room temperature). Therefore, Li3InCl2.5F3.5 has the potential to be used in the field of all-solid-state lithium-ion batteries as a new type of halide electrolyte.
与传统固态电解质相比，卤化物固态电解质具有多种优势，如电化学窗口更宽、与氧化物阴极材料的兼容性更好、空气稳定性更强、制备条件更简便等，因此可用于工业生产。我们以典型的卤化物固态电解质 Li3InCl6 为研究对象，利用基于第一性原理计算的合金理论自动工具包预测了掺杂 Br、F 和 Ga 后最稳定的结构，并验证了预测模型的准确性。为了研究三种等效掺杂基态构型的 Li3InCl6 作为全固态锂离子电池固态电解质的潜力，利用第一性原理计算分析了它们的晶体结构、带隙、凸堆积能、电化学稳定窗口和锂离子电导率等具体性质。经过综合评估，确定掺杂 F 的基态构型 Li3InCl2.5F3.5 具有更好的热稳定性、更宽的电化学稳定窗口和更高的锂离子电导率（室温下为 1.80 mS cm-1）。因此，Li3InCl2.5F3.5 作为一种新型卤化物电解质，有望应用于全固态锂离子电池领域。
{"title":"Prediction of Ground State Configurations and Electrochemical Properties of Li3InCl6 doped with F, Br and Ga","authors":"Zhengyu Lu, Le-Tian Chen, Xu Hu, Su-Ya Chen, Xu Zhang, Zhen Zhou","doi":"10.1088/0256-307x/41/5/058201","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/058201","url":null,"abstract":"\u0000 Compared with conventional solid-state electrolytes, halide solid-state electrolytes have several advantages such as a wider electrochemical window, better compatibility with oxide cathode materials, improved air stability, and easier preparation conditions making them conductive to industrial production. We focused on a typical halide solid-state electrolyte, Li3InCl6 and predicted the most stable structure after doping with Br, F, and Ga by using the Alloy Theoretic Automated Toolkit based on first-principles calculations, and verified the accuracy of the prediction model. To investigate the potential of three equivalently doped ground state configurations of Li3InCl6 as solidstate electrolytes for all-solid-state lithium-ion batteries, their specific properties such as crystal structure, band gap, convex packing energy, electrochemical stability window, and lithium-ion conductivity were computationally analyzed using first-principles calculations. After a comprehensive evaluation, it was determined that the F-doped ground state configuration Li3InCl2.5F3.5 exhibits better thermal stability, wider electrochemical stability window, and better lithium ion conductivity (1.80 mS cm-1 at room temperature). Therefore, Li3InCl2.5F3.5 has the potential to be used in the field of all-solid-state lithium-ion batteries as a new type of halide electrolyte.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140671915","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 : 2024-04-19DOI: 10.1088/0256-307x/41/5/057501
Xinxin Jiang, Zhikuan Wang, Chong Li, Xuelian Sun, Lei Yang, Dong-Xu Li, Bin Cui, Desheng Liu
Electrical control of magnetism in van der Waals semiconductors is a promising step toward developing two-dimensional ultralow-power-consumption spintronic devices for processing and storing information. Here, we propose a design for two-dimensional van der Waals heterostructures (vdWHs) that can host ferroelectricity and ferromagnetism simultaneously under hole doping. By contacting an InSe monolayer and forming an InSe/In2Se3 vdWH, the switchable built-in electric field from the reversible out-of-plane polarization enables robust control of the band alignment. Furthermore, switching between the two ferroelectric states (P↑ and P↓) of hole-doped In2Se3 with an external electric field can interchange the ON and OFF states of the nonvolatile magnetism. More interestingly, doping concentration and strain can effectively tune the magnetic moment and polarization energy. Therefore, this provides a platform for realizing multiferroics in ferroelectric heterostructures, showing great potential in nonvolatile memories and ferroelectric field-effect transistors.
对范德华半导体中的磁性进行电控制，是开发用于处理和存储信息的二维超低功耗自旋电子器件的一个很有前景的步骤。在此，我们提出了一种二维范德瓦尔斯异质结构（vdWHs）的设计方案，在空穴掺杂的情况下，它可以同时承载铁电性和铁磁性。通过接触 InSe 单层并形成 InSe/In2Se3 vdWH，可逆面外极化产生的可切换内置电场实现了对带排列的稳健控制。此外，在外加电场的作用下，在空穴掺杂的 In2Se3 的两种铁电状态（P↑ 和 P↓）之间切换，可以交换非易失性磁性的 ON 和 OFF 状态。更有趣的是，掺杂浓度和应变可以有效调节磁矩和极化能。因此，这为在铁电异质结构中实现多铁性提供了一个平台，在非易失性存储器和铁电场效应晶体管中显示出巨大的潜力。
{"title":"Hole doped nonvolatile and electrically controllable magnetism in van der Waals ferroelectric heterostructures","authors":"Xinxin Jiang, Zhikuan Wang, Chong Li, Xuelian Sun, Lei Yang, Dong-Xu Li, Bin Cui, Desheng Liu","doi":"10.1088/0256-307x/41/5/057501","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/057501","url":null,"abstract":"\u0000 Electrical control of magnetism in van der Waals semiconductors is a promising step toward developing two-dimensional ultralow-power-consumption spintronic devices for processing and storing information. Here, we propose a design for two-dimensional van der Waals heterostructures (vdWHs) that can host ferroelectricity and ferromagnetism simultaneously under hole doping. By contacting an InSe monolayer and forming an InSe/In2Se3 vdWH, the switchable built-in electric field from the reversible out-of-plane polarization enables robust control of the band alignment. Furthermore, switching between the two ferroelectric states (P↑ and P↓) of hole-doped In2Se3 with an external electric field can interchange the ON and OFF states of the nonvolatile magnetism. More interestingly, doping concentration and strain can effectively tune the magnetic moment and polarization energy. Therefore, this provides a platform for realizing multiferroics in ferroelectric heterostructures, showing great potential in nonvolatile memories and ferroelectric field-effect transistors.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140683473","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 : 2024-04-17DOI: 10.1088/0256-307x/41/5/057502
Guo-Liang Yu, Xin-Yan He, Sheng-Bin Shi, Yang Qiu, Mingmin Zhu, Jia-Wei Wang, Yan Li, Yuan-Xun Li, Jie Wang, Haomiao Zhou
Magnetic domain wall (DW), as one of the promising information carriers in spintronic devices, have been widely investigated owing to their nonlinear dynamics and tunable properties. Here, we have theoretically and numerically demonstrated the DW dynamics driven by the synergistic interaction between current-induced spintransfer torque (STT) and voltage-controlled strain gradient (VCSG) in multiferroic heterostructures. Through electromechanical and micromagnetic simulations, we have shown that a desirable strain gradient can be created and further modulated the equilibrium position and velocity of the current-driven DW motion. Meanwhile, an analytical Thiele’s model is developed to describe the steady motion of DW and the analytical results are quite consistent with the simulation one. Finally, we find that this combination effect can be leveraged to design DW-based biological neurons where the synergistic interaction between STT and VCSG-driven DW motion as integrating and leaking motivates mimicking leaky-integrate-and-fire (LIF) and self-reset function. Importantly, the firing response of the LIF neuron can be efficiently modulated, facilitating the exploration of tunable activation function generators, which can further help improve the computational capability of the neuromorphic system.
{"title":"The Combined Effect of Spin-transfer Torque and Voltage-controlled Strain Gradient on Magnetic Domain-wall Dynamics: Toward Tunable Spintronic Neuron","authors":"Guo-Liang Yu, Xin-Yan He, Sheng-Bin Shi, Yang Qiu, Mingmin Zhu, Jia-Wei Wang, Yan Li, Yuan-Xun Li, Jie Wang, Haomiao Zhou","doi":"10.1088/0256-307x/41/5/057502","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/057502","url":null,"abstract":"\u0000 Magnetic domain wall (DW), as one of the promising information carriers in spintronic devices, have been widely investigated owing to their nonlinear dynamics and tunable properties. Here, we have theoretically and numerically demonstrated the DW dynamics driven by the synergistic interaction between current-induced spintransfer torque (STT) and voltage-controlled strain gradient (VCSG) in multiferroic heterostructures. Through electromechanical and micromagnetic simulations, we have shown that a desirable strain gradient can be created and further modulated the equilibrium position and velocity of the current-driven DW motion. Meanwhile, an analytical Thiele’s model is developed to describe the steady motion of DW and the analytical results are quite consistent with the simulation one. Finally, we find that this combination effect can be leveraged to design DW-based biological neurons where the synergistic interaction between STT and VCSG-driven DW motion as integrating and leaking motivates mimicking leaky-integrate-and-fire (LIF) and self-reset function. Importantly, the firing response of the LIF neuron can be efficiently modulated, facilitating the exploration of tunable activation function generators, which can further help improve the computational capability of the neuromorphic system.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140690526","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 : 2024-04-17DOI: 10.1088/0256-307x/41/5/054701
Jing Xu, Rui Xiao, Hong Li
Searching and designing new materials play crucial roles in the development of energy storage devices. In today's world where machine learning technology has shown strong predictive ability for various tasks, the combination with machine learning technology will accelerate the process of material development. Herein, we develop ESM Cloud Toolkit for energy storage materials based on MatElab platform, which is designed as a convenient and accurate way to automatically record and save the raw data of scientific research. The ESM Cloud Toolkit includes multiple features such as automatic archiving of computational simulation data, post-processing of experimental data and machine learning applications. It makes the entire research workflow more automated and reduces the entry barrier for the application of machine learning technology in the domain of energy storage materials. It integrates data archive, traceability, processing, and reutilization, and allowing individual research data to play a greater role in the era of AI.
{"title":"ESM Cloud Toolkit: A copilot for energy storage material research","authors":"Jing Xu, Rui Xiao, Hong Li","doi":"10.1088/0256-307x/41/5/054701","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/054701","url":null,"abstract":"\u0000 Searching and designing new materials play crucial roles in the development of energy storage devices. In today's world where machine learning technology has shown strong predictive ability for various tasks, the combination with machine learning technology will accelerate the process of material development. Herein, we develop ESM Cloud Toolkit for energy storage materials based on MatElab platform, which is designed as a convenient and accurate way to automatically record and save the raw data of scientific research. The ESM Cloud Toolkit includes multiple features such as automatic archiving of computational simulation data, post-processing of experimental data and machine learning applications. It makes the entire research workflow more automated and reduces the entry barrier for the application of machine learning technology in the domain of energy storage materials. It integrates data archive, traceability, processing, and reutilization, and allowing individual research data to play a greater role in the era of AI.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140693226","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 : 2024-04-17DOI: 10.1088/0256-307x/41/5/057302
Lingling Gao, J. Lai, Dong Chen, Cuiying Pei, Qi Wang, Yi Zhao, Changhua Li, W. Cao, Juefei Wu, Yulin Chen, Xingqiu Chen, Yan Sun, C. Felser, Yanpeng Qi
Recently, the giant intrinsic anomalous Hall effect (AHE) has been observed in the materials with kagome lattice. In this study, we systematically investigate the influence of high pressure on the AHE in the ferromagnet LiMn6Sn6 with clean Mn kagome lattice. Our in-situ high-pressure Raman spectroscopy indicates that the crystal structure of LiMn6Sn6 maintains a hexagonal phase under high pressures up to 8.51 GPa. The anomalous Hall conductivity (AHC) σxy A remains around 150 Ω-1 cm-1, dominated by the intrinsic mechanism. Combined with theoretical calculations, our results indicate that the stable AHE under pressure in LiMn6Sn6 originates from the robust electronic and magnetic structure.
{"title":"Pressure-tunable large anomalous Hall effect in ferromagnetic metal LiMn6Sn6","authors":"Lingling Gao, J. Lai, Dong Chen, Cuiying Pei, Qi Wang, Yi Zhao, Changhua Li, W. Cao, Juefei Wu, Yulin Chen, Xingqiu Chen, Yan Sun, C. Felser, Yanpeng Qi","doi":"10.1088/0256-307x/41/5/057302","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/057302","url":null,"abstract":"\u0000 Recently, the giant intrinsic anomalous Hall effect (AHE) has been observed in the materials with kagome lattice. In this study, we systematically investigate the influence of high pressure on the AHE in the ferromagnet LiMn6Sn6 with clean Mn kagome lattice. Our in-situ high-pressure Raman spectroscopy indicates that the crystal structure of LiMn6Sn6 maintains a hexagonal phase under high pressures up to 8.51 GPa. The anomalous Hall conductivity (AHC) σxy\u0000 A remains around 150 Ω-1 cm-1, dominated by the intrinsic mechanism. Combined with theoretical calculations, our results indicate that the stable AHE under pressure in LiMn6Sn6 originates from the robust electronic and magnetic structure.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140692393","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}
Ethylene, the simplest model of a carbon-carbon double bond system, is pivotal in numerous chemical and biological processes. By employing intense infrared (IR) laser pump-probe techniques alongside coincidence measurements, we investigated the ultrafast non-adiabatic dynamics involved in the breakage of carbon-carbon double bonds and hydrogen elimination in ethylene's dissociation. Our study entailed analyzing the dynamic Kinetic Energy Release (KER) spectra to assess three bond-breaking scenarios, the movements of nuclei, and the structural changes around the carbon atoms. This allowed us to evaluate the relaxation dynamics and characteristics of various dissociative states. Notably, we observed a significant rise in the yield of fragments resulting from CH bond breakage as the delay time extended, suggesting non-adiabatic coupling through conical intersections from CC bond breakage as a probable cause.
乙烯是碳碳双键系统的最简单模型，在许多化学和生物过程中起着关键作用。通过采用强红外（IR）激光泵浦探针技术和巧合测量，我们研究了乙烯解离过程中碳碳双键断裂和氢消除所涉及的超快非绝热动力学。我们的研究包括分析动态动能释放（KER）光谱，以评估三种断键情况、原子核的运动以及碳原子周围的结构变化。这使我们能够评估各种解离状态的弛豫动力学和特征。值得注意的是，随着延迟时间的延长，我们观察到 CH 键断裂产生的碎片产量显著增加，这表明 CC 键断裂通过锥形交叉产生的非绝热耦合可能是一个原因。
{"title":"Direct observation on H-elimination enhancement from C2H4 through non-adiabatic process by femtosecond laser induced Coulomb explosion","authors":"Wuwei Jin, Chuncheng Wang, Xiaoge Zhao, Yizhang Yang, D. Ren, Zejin Liu, Xiaokai Li, Sizuo Luo, Dajun Ding","doi":"10.1088/0256-307x/41/5/053101","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/053101","url":null,"abstract":"\u0000 Ethylene, the simplest model of a carbon-carbon double bond system, is pivotal in numerous chemical and biological processes. By employing intense infrared (IR) laser pump-probe techniques alongside coincidence measurements, we investigated the ultrafast non-adiabatic dynamics involved in the breakage of carbon-carbon double bonds and hydrogen elimination in ethylene's dissociation. Our study entailed analyzing the dynamic Kinetic Energy Release (KER) spectra to assess three bond-breaking scenarios, the movements of nuclei, and the structural changes around the carbon atoms. This allowed us to evaluate the relaxation dynamics and characteristics of various dissociative states. Notably, we observed a significant rise in the yield of fragments resulting from CH bond breakage as the delay time extended, suggesting non-adiabatic coupling through conical intersections from CC bond breakage as a probable cause.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140695092","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 : 2024-04-12DOI: 10.1088/0256-307x/41/5/050301
Ziheng Lan, Wenquan Liu, Yang Wu, Xiangyu Ye, Zhesen Yang, Chang-Kui Duan, Ya Wang, Xing Rong
Lee-Yang theory clearly demonstrate where the phase transition of many-body systems occurs and the asymptotic behavior near the phase transition using the partition function under complex parameters. The complex parameters make the direct investigation of Lee-Yang theory in practical systems challenging. Here we construct a non-Hermitian quantum system that can correspond to the one-dimensional Ising model with imaginary parameters through the equality of partition functions. By adjusting the non-Hermitian parameter, we successfully obtained the partition function under different imaginary magnetic fields and observed the Lee-Yang zeros. We also observe the critical behavior of free energy in vicinity of Lee-Yang zero that is consistent with theoretical prediction. Our work provides a protocol to study Lee-Yang zeros of the one-dimensional Ising model using a single-qubit non-Hermitian system.
{"title":"Experimental investigation of Lee-Yang criticality using non-Hermitian quantum system","authors":"Ziheng Lan, Wenquan Liu, Yang Wu, Xiangyu Ye, Zhesen Yang, Chang-Kui Duan, Ya Wang, Xing Rong","doi":"10.1088/0256-307x/41/5/050301","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/050301","url":null,"abstract":"\u0000 Lee-Yang theory clearly demonstrate where the phase transition of many-body systems occurs and the asymptotic behavior near the phase transition using the partition function under complex parameters. The complex parameters make the direct investigation of Lee-Yang theory in practical systems challenging. Here we construct a non-Hermitian quantum system that can correspond to the one-dimensional Ising model with imaginary parameters through the equality of partition functions. By adjusting the non-Hermitian parameter, we successfully obtained the partition function under different imaginary magnetic fields and observed the Lee-Yang zeros. We also observe the critical behavior of free energy in vicinity of Lee-Yang zero that is consistent with theoretical prediction. Our work provides a protocol to study Lee-Yang zeros of the one-dimensional Ising model using a single-qubit non-Hermitian system.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140712477","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 : 2024-04-10DOI: 10.1088/0256-307x/41/5/056101
Shi-Wei Ye, Song-Yuan Geng, Han-Pu Liang, Xie Zhang, Su-Huai Wei
Transmutation is an efficient approach for material design. For example, ternary compound CuGaSe2 in chalcopyrite structure is a promising material for novel optoelectronic and thermoelectric device applications. It can be considered as formed from the binary host compound ZnSe in zinc-blende structure by cation transmutation (i.e., replacing two Zn by one Cu and one Ga). While cation-transmutated materials are common, anion-transmutated ternary materials are rare, for example, Zn2AsBr (i.e., replacing two Se by one As and one Br) is not reported. The physical origin for this puzzling disparity is unclear. In this work, we employ first-principles calculations to address this issue, and find that the distinct differences in stability between cation-transmutated (mix-cation) and anion-transmutated (mix-anion) compounds originate from their different trend of ionic radii as function of their ionic state, i.e., for cations, the radius decreases with the increasing ionic state, whereas for anions, the radius increase with the increasing absolute ionic state. Therefore, for mix-cation compounds, the strain energy and Coulomb energy can be simultaneously optimized to make these materials stable. In contrast, for mix-anion systems, minimization of Coulomb energy will increase the strain energy, thus the system becomes unstable or less stable. Thus, the trend of decreasing strain energy and Coulomb energy is consistent in mix-cation compounds, while it is opposite in mix-anion compounds. Furthermore, the study suggests that the stability strategy for mixanion compounds can be controlled by the ratio of ionic radii r 3/r 1, with a smaller ratio indicating greater stability. Our work, thus, elucidates the intrinsic stability trend of transmutated materials and provides guidelines for the design of novel ternary materials for various device applications.
嬗变是一种有效的材料设计方法。例如，黄铜矿结构的三元化合物 CuGaSe2 是一种很有前途的新型光电和热电器件应用材料。它可以看作是由锌蓝晶结构的二元主化合物 ZnSe 通过阳离子嬗变（即用一个铜和一个镓取代两个锌）形成的。阳离子嬗变的材料很常见，但阴离子嬗变的三元材料却很少见，例如，Zn2AsBr（即用一个 As 和一个 Br 取代两个 Se）就未见报道。造成这种令人费解的差异的物理原因尚不清楚。在这项工作中，我们利用第一原理计算来解决这个问题，并发现阳离子变异（混合阳离子）和阴离子变异（混合阴离子）化合物在稳定性方面的明显差异源于它们的离子半径随离子状态变化的不同趋势，即阳离子的半径随离子状态的增加而减小，而阴离子的半径则随绝对离子状态的增加而增大。因此，对于混合阳离子化合物，可以同时优化应变能和库仑能，使这些材料变得稳定。相反，对于阴阳离子混合体系，库仑能最小化会增加应变能，从而使体系变得不稳定或不太稳定。因此，在混合阳离子化合物中，应变能和库仑能的降低趋势是一致的，而在混合阴离子化合物中则相反。此外，研究还表明，混合阴离子化合物的稳定性策略可由离子半径 r 3/r 1 的比值控制，比值越小，稳定性越强。因此，我们的工作阐明了转化材料的内在稳定性趋势，并为设计新型三元材料在各种设备中的应用提供了指导。
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