The Institute of Physics, Chinese Academy of Sciences, is in charge of the construction of the Synergetic Extreme Condition User Facility （SECUF） in Huairou, Beijing. The SECUF is a comprehensive facility focused on...The Institute of Physics, Chinese Academy of Sciences, is in charge of the construction of the Synergetic Extreme Condition User Facility （SECUF） in Huairou, Beijing. The SECUF is a comprehensive facility focused on providing extreme physical conditions for scientific research, including an ultralow temperature, ultrahigh pressure, ultrahigh magnetic field, and ultrafast laser. The ultralow temperature will be realized by the sub-millikelvin （sub-mK） station, whose main component is an adiabatic nuclear demagnetization refrigerator （ANDR）. The refrigerator is designed to have a base temperature below 1 mK and a magnetic field up to 16 T for experiments, as well as a characteristic parameter of B/T ≥-104 T/K. In this review, we introduce adiabatic nuclear demagnetization refrigeration, thermometry from 10 mK to sub-mK, the properties and parameters of the ANDR of the SECUF, and related prospective research topics.展开更多
二维过渡金属硫族化合物(transition metal dichalcogenides, TMDCs)是继石墨烯之后的新型范德瓦耳斯材料,由于其天然的二维特性以及强自旋轨道耦合作用(spin-orbital coupling, SOC),导致诸如金属-绝缘体转变、电荷密度波(charge densi...二维过渡金属硫族化合物(transition metal dichalcogenides, TMDCs)是继石墨烯之后的新型范德瓦耳斯材料,由于其天然的二维特性以及强自旋轨道耦合作用(spin-orbital coupling, SOC),导致诸如金属-绝缘体转变、电荷密度波(charge density wave, CDW)、能谷电子学、非常规超导电性等新颖物理性质的出现,使得这类材料成为研究低维量子物理的又一理想平台.其中能谷电子学与拓扑超导已经成为近年来凝聚态物理前沿研究的热点方向.本文在综述TMDCs材料的结构与基本物理性质的基础上,重点介绍了最近发展的用于生长原子层厚度的TMDCs材料的熔盐辅助化学气相沉积方法、在Se掺杂的MoSexTe2-x薄膜中实现的Td相到1T′相再到2H相的结构相变与超导增强现象,以及在少层Td-MoTe2中发现的非对称性SOC作用引起的类伊辛超导现象.最后,展望了TMDCs材料的潜在应用与可能存在的拓扑超导.展开更多
基金Project supported by the National Basic Research Program of China(Grant Nos.2016YFA0300601,2015CB921402,2011CB921702,and 2009CB929101)the National Natural Science Foundation of China(Grant Nos.11527806,91221203,11174340,11174357,and 91421303)+1 种基金the Strategic Priority Research Program B of the Chinese Academy of Sciences(Grant No.XDB07010100)the support from Hundreds Talent Program,Chinese Academy of Sciences
文摘The Institute of Physics, Chinese Academy of Sciences, is in charge of the construction of the Synergetic Extreme Condition User Facility （SECUF） in Huairou, Beijing. The SECUF is a comprehensive facility focused on providing extreme physical conditions for scientific research, including an ultralow temperature, ultrahigh pressure, ultrahigh magnetic field, and ultrafast laser. The ultralow temperature will be realized by the sub-millikelvin （sub-mK） station, whose main component is an adiabatic nuclear demagnetization refrigerator （ANDR）. The refrigerator is designed to have a base temperature below 1 mK and a magnetic field up to 16 T for experiments, as well as a characteristic parameter of B/T ≥-104 T/K. In this review, we introduce adiabatic nuclear demagnetization refrigeration, thermometry from 10 mK to sub-mK, the properties and parameters of the ANDR of the SECUF, and related prospective research topics.
文摘二维过渡金属硫族化合物(transition metal dichalcogenides, TMDCs)是继石墨烯之后的新型范德瓦耳斯材料,由于其天然的二维特性以及强自旋轨道耦合作用(spin-orbital coupling, SOC),导致诸如金属-绝缘体转变、电荷密度波(charge density wave, CDW)、能谷电子学、非常规超导电性等新颖物理性质的出现,使得这类材料成为研究低维量子物理的又一理想平台.其中能谷电子学与拓扑超导已经成为近年来凝聚态物理前沿研究的热点方向.本文在综述TMDCs材料的结构与基本物理性质的基础上,重点介绍了最近发展的用于生长原子层厚度的TMDCs材料的熔盐辅助化学气相沉积方法、在Se掺杂的MoSexTe2-x薄膜中实现的Td相到1T′相再到2H相的结构相变与超导增强现象,以及在少层Td-MoTe2中发现的非对称性SOC作用引起的类伊辛超导现象.最后,展望了TMDCs材料的潜在应用与可能存在的拓扑超导.
