Intrinsic magnetic topological insulators have been reported to exhibit novel physical phenomena such as the quantum anomalous Hall effect and axion insulator states,demonstrating potential for applications in spintro...Intrinsic magnetic topological insulators have been reported to exhibit novel physical phenomena such as the quantum anomalous Hall effect and axion insulator states,demonstrating potential for applications in spintronics and topological quantum computing.Here we perform low-temperature scanning tunneling microscopy(STM)investigations of the antiferromagnetic ground state of MnSb_(2)Te_(4),a predicted magnetic topological insulator isostructural with MnBi_(2)Te_(4).We visualize the hexagonal Te-terminated surface of MnSb_(2)Te_(4)and identify two distinct defects originating from different antisite substitutions.Notably,we identify an in-gap state above the Fermi energy where the tunneling spectrum exhibits a negative differential conductance behavior.This electronic state can be modulated by external electric and magnetic fields,suggesting effective pathways for electronic state manipulation.Spin-resolved STM measurements further reveal additional magnetic resonance peaks associated with Mn antisite defects.Our results provide novel insights into the investigation of magnetic topological insulators and demonstrate a promising approach to modulate the localized electronic states.展开更多
目的运用Meta分析方法研究加减射干麻黄汤治疗儿童咳嗽变异性哮喘的疗效及安全性。方法全面检索已发表中药射干麻黄汤为基础方或联合西药治疗儿童咳嗽变异性哮喘中干预措施为使用该方的临床随机对照试验的相关文献。两名评价人员分别进...目的运用Meta分析方法研究加减射干麻黄汤治疗儿童咳嗽变异性哮喘的疗效及安全性。方法全面检索已发表中药射干麻黄汤为基础方或联合西药治疗儿童咳嗽变异性哮喘中干预措施为使用该方的临床随机对照试验的相关文献。两名评价人员分别进行文献检索,用改良的Jadad量表进行文献质量评价、筛选出符合纳入条件的文献后对数据进行提取,最后采用Rev Man 5.3软件进行Meta分析。结果筛选并纳入13个随机对照试验,共1491例患者,经Meta分析显示,观察组有效率优于对照组,差异有统计学意义[RR=1.23,95%CI=(1.18,1.29),z=9.23,P<0.00001];咳嗽症状缓解时间短于对照组,差异有统计学意义[MD=-0.85,95%CI=(-0.94,-0.77),z=19.59,P<0.00001];不良反应发生率低于对照组,差异有统计学意义[RR=0.40,95%CI=(0.27,0.60),z=4.42,P<0.00001]。结论加减射干麻黄汤治疗儿童咳嗽变异性哮喘具有良好的疗效及安全性。展开更多
We investigate the evolution of magnetic properties as well as the content and distribution of Mn for Mn(Sb_(1-x)Bi_(x))_(2)Te_(4) single crystals grown by large-temperature-gradient chemical vapor transport method.It...We investigate the evolution of magnetic properties as well as the content and distribution of Mn for Mn(Sb_(1-x)Bi_(x))_(2)Te_(4) single crystals grown by large-temperature-gradient chemical vapor transport method.It is found that the ferromagnetic MnSb_(2)Te_(4) changes to antiferromagnetism with Bi doping when x≥0.25.Further analysis implies that the occupations of Mn ions at Sb/Bi site Mn_(Sb/Bi) and Mn site Mn_(Mn) have a strong influence on the magnetic ground states of these systems.With the decrease of Mn_(Mn) increase of Mn_(Sb/Bi),the system will favor the ferromagnetic ground state.In addition,the rapid decrease of T_(C/N) with increasing Bi content when x ≤0.25 and the insensitivity of T_(N) to x when x> 0.25 suggest that the main magnetic interaction may change from the Ruderman-Kittel-Kasuya-Yosida type at low Bi doping region to the van-Vleck type in high Bi doped samples.展开更多
基金Project supported by the National Key R&D Program of China(Grant Nos.2022YFA1403800 and 2023YFA1406500)the National Natural Science Foundation of China(Grant No.12274459)。
文摘Intrinsic magnetic topological insulators have been reported to exhibit novel physical phenomena such as the quantum anomalous Hall effect and axion insulator states,demonstrating potential for applications in spintronics and topological quantum computing.Here we perform low-temperature scanning tunneling microscopy(STM)investigations of the antiferromagnetic ground state of MnSb_(2)Te_(4),a predicted magnetic topological insulator isostructural with MnBi_(2)Te_(4).We visualize the hexagonal Te-terminated surface of MnSb_(2)Te_(4)and identify two distinct defects originating from different antisite substitutions.Notably,we identify an in-gap state above the Fermi energy where the tunneling spectrum exhibits a negative differential conductance behavior.This electronic state can be modulated by external electric and magnetic fields,suggesting effective pathways for electronic state manipulation.Spin-resolved STM measurements further reveal additional magnetic resonance peaks associated with Mn antisite defects.Our results provide novel insights into the investigation of magnetic topological insulators and demonstrate a promising approach to modulate the localized electronic states.
文摘目的运用Meta分析方法研究加减射干麻黄汤治疗儿童咳嗽变异性哮喘的疗效及安全性。方法全面检索已发表中药射干麻黄汤为基础方或联合西药治疗儿童咳嗽变异性哮喘中干预措施为使用该方的临床随机对照试验的相关文献。两名评价人员分别进行文献检索,用改良的Jadad量表进行文献质量评价、筛选出符合纳入条件的文献后对数据进行提取,最后采用Rev Man 5.3软件进行Meta分析。结果筛选并纳入13个随机对照试验,共1491例患者,经Meta分析显示,观察组有效率优于对照组,差异有统计学意义[RR=1.23,95%CI=(1.18,1.29),z=9.23,P<0.00001];咳嗽症状缓解时间短于对照组,差异有统计学意义[MD=-0.85,95%CI=(-0.94,-0.77),z=19.59,P<0.00001];不良反应发生率低于对照组,差异有统计学意义[RR=0.40,95%CI=(0.27,0.60),z=4.42,P<0.00001]。结论加减射干麻黄汤治疗儿童咳嗽变异性哮喘具有良好的疗效及安全性。
基金Project supported by the Beijing Natural Science Foundation (Grant No. Z200005)the National Key R&D Program of China (Grant Nos. 2022YFA1403800 and 2023YFA1406500)+1 种基金the National Natural Science Foundation of China (Grant No. 12274459)Collaborative Research Project of Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology。
文摘We investigate the evolution of magnetic properties as well as the content and distribution of Mn for Mn(Sb_(1-x)Bi_(x))_(2)Te_(4) single crystals grown by large-temperature-gradient chemical vapor transport method.It is found that the ferromagnetic MnSb_(2)Te_(4) changes to antiferromagnetism with Bi doping when x≥0.25.Further analysis implies that the occupations of Mn ions at Sb/Bi site Mn_(Sb/Bi) and Mn site Mn_(Mn) have a strong influence on the magnetic ground states of these systems.With the decrease of Mn_(Mn) increase of Mn_(Sb/Bi),the system will favor the ferromagnetic ground state.In addition,the rapid decrease of T_(C/N) with increasing Bi content when x ≤0.25 and the insensitivity of T_(N) to x when x> 0.25 suggest that the main magnetic interaction may change from the Ruderman-Kittel-Kasuya-Yosida type at low Bi doping region to the van-Vleck type in high Bi doped samples.
