Manipulating emergent quantum phenomena is a key issue for understanding the underlying physics and contributing to possible applications.Here we study the evolution of insulating ground states of Ta_(2)Pu_(3)Te_(5) a...Manipulating emergent quantum phenomena is a key issue for understanding the underlying physics and contributing to possible applications.Here we study the evolution of insulating ground states of Ta_(2)Pu_(3)Te_(5) and Ta_(2)Ni_(3)Te_(5) under in-situ surface potassium deposition via angle-resolved photoemission spectroscopy.Our results confirm the excitonic insulator character of Ta_(2)d_(3)Te_(5).Upon surface doping,the size of its global gap decreases obviously.After a deposition time of more than 7 min,the potassium atoms induce a metal-insulator phase transition and make the system recover to a normal state.In contrast,our results show that the isostructural compound Ta_(2)Ni_(3)Te_(5) is a conventional insulator.The size of its global gap decreases upon surface doping,but persists positive throughout the doping process.Our results not only confirm the excitonic origin of the band gap in Ta_(2)Pd_(3)Te_(5),but also offer an effective method for designing functional quantum devices in the future.展开更多
To the Editor,Non-human primate(NHP)models are advantageous for mimicking human addiction with high behavioural validity.1 However,current NHP drug addiction models(eg,self-administration)often require a comprehensive...To the Editor,Non-human primate(NHP)models are advantageous for mimicking human addiction with high behavioural validity.1 However,current NHP drug addiction models(eg,self-administration)often require a comprehensive behavioural training paradigm,relatively expensive apparatus and invasive surgical procedures.展开更多
We report the laser-chirp controlled terahertz(THz) wave generation from two-color-laser-induced air plasma.Our experimental results reveal that the THz wave is affected by both the laser energy and chirp,leading to r...We report the laser-chirp controlled terahertz(THz) wave generation from two-color-laser-induced air plasma.Our experimental results reveal that the THz wave is affected by both the laser energy and chirp,leading to radiation minima that can be quantitatively reconstructed using the linear-dipole-array model.The phase difference between the two colors,determined by the chirp and intensity of the laser,can account for the radiation minima.Furthermore,we observe an asynchronous variation in the generated THz spectrum,which suggests a THz frequency-dependent phase matching between the laser pulse and THz wave.These results highlight the importance of laser chirp during the THz wave generation and demonstrate the possibility of modulating the THz yields and spectrum through chirping the incident laser pulse.This work can provide valuable insights into the mechanism of plasma-based THz wave generation and offer a unique means to control THz emissions.展开更多
BACKGROUND In a previous study,autologous bone marrow infusion(ABMI)was performed in patients with decompensated liver cirrhosis(DLC)and acquired immunodefi-ciency syndrome and achieved good results,but whether splene...BACKGROUND In a previous study,autologous bone marrow infusion(ABMI)was performed in patients with decompensated liver cirrhosis(DLC)and acquired immunodefi-ciency syndrome and achieved good results,but whether splenectomy affected outcome was unclear.AIM To investigate the efficacy of ABMI combined with splenectomy for treatment of DLC.METHODS Eighty-three patients with DLC were divided into an intervention group(43 cases)and control group(40 cases)according to whether splenectomy was performed.The control group was treated with ABMI through the right omental RESULTS After ABMI,the prothrombin time,serum total bilirubin levels,ascites volume and model for end-stage liver disease score in both groups were significantly lower,while the albumin levels were significantly higher than before ABMI(P<0.01),but there were no significant differences between the groups(P>0.05).After ABMI,the white blood cell and platelets counts in both groups were significantly higher than before ABMI(P<0.01),and the counts in the intervention group were significantly higher than in the control group(P<0.01).After ABMI the CD4+and CD8+T cell counts in both groups were significantly higher than before ABMI(P<0.01).The CD8+T cell counts in the intervention group increased continuously and the increase had a shorter duration compared with control group.CONCLUSION ABMI through the portal vein in patients with DLC can significantly improve liver synthetic and secretory functions,and splenectomy promotes improvement of bone marrow hematopoietic and cellular immune functions.展开更多
基金Project supported by the Ministry of Science and Technology of China (Grant No. 2022YFA1403800)the National Natural Science Foundation of China (Grant Nos. U2032204,12188101, and U22A6005)+2 种基金the Chinese Academy of Sciences (Grant No. XDB33000000)the Synergetic Extreme Condition User Facility (SECUF)the Center for Materials Genome。
文摘Manipulating emergent quantum phenomena is a key issue for understanding the underlying physics and contributing to possible applications.Here we study the evolution of insulating ground states of Ta_(2)Pu_(3)Te_(5) and Ta_(2)Ni_(3)Te_(5) under in-situ surface potassium deposition via angle-resolved photoemission spectroscopy.Our results confirm the excitonic insulator character of Ta_(2)d_(3)Te_(5).Upon surface doping,the size of its global gap decreases obviously.After a deposition time of more than 7 min,the potassium atoms induce a metal-insulator phase transition and make the system recover to a normal state.In contrast,our results show that the isostructural compound Ta_(2)Ni_(3)Te_(5) is a conventional insulator.The size of its global gap decreases upon surface doping,but persists positive throughout the doping process.Our results not only confirm the excitonic origin of the band gap in Ta_(2)Pd_(3)Te_(5),but also offer an effective method for designing functional quantum devices in the future.
基金This study was financially supported by the National Natural Science Foundation of China(81822017,82171493,52003021)the Lingang Laboratory(LG-QS-202203-10)the Shanghai Municipal Education Commission-Gaofeng Clinical Medicine Grant Support(20181715).
文摘To the Editor,Non-human primate(NHP)models are advantageous for mimicking human addiction with high behavioural validity.1 However,current NHP drug addiction models(eg,self-administration)often require a comprehensive behavioural training paradigm,relatively expensive apparatus and invasive surgical procedures.
基金supported by the National Natural Science Foundation of China (Grant Nos.12174449,12225511,T2241002,12074250,11991073,12135009,61988102,and 61971397)the National Key Research and Development Program of China (Grant Nos.2019YFA0307703 and 2018YFB2202500)。
文摘We report the laser-chirp controlled terahertz(THz) wave generation from two-color-laser-induced air plasma.Our experimental results reveal that the THz wave is affected by both the laser energy and chirp,leading to radiation minima that can be quantitatively reconstructed using the linear-dipole-array model.The phase difference between the two colors,determined by the chirp and intensity of the laser,can account for the radiation minima.Furthermore,we observe an asynchronous variation in the generated THz spectrum,which suggests a THz frequency-dependent phase matching between the laser pulse and THz wave.These results highlight the importance of laser chirp during the THz wave generation and demonstrate the possibility of modulating the THz yields and spectrum through chirping the incident laser pulse.This work can provide valuable insights into the mechanism of plasma-based THz wave generation and offer a unique means to control THz emissions.
基金Supported by Shenkang Hospital Development Center of Shanghai,China,No.SHDC12016129.
文摘BACKGROUND In a previous study,autologous bone marrow infusion(ABMI)was performed in patients with decompensated liver cirrhosis(DLC)and acquired immunodefi-ciency syndrome and achieved good results,but whether splenectomy affected outcome was unclear.AIM To investigate the efficacy of ABMI combined with splenectomy for treatment of DLC.METHODS Eighty-three patients with DLC were divided into an intervention group(43 cases)and control group(40 cases)according to whether splenectomy was performed.The control group was treated with ABMI through the right omental RESULTS After ABMI,the prothrombin time,serum total bilirubin levels,ascites volume and model for end-stage liver disease score in both groups were significantly lower,while the albumin levels were significantly higher than before ABMI(P<0.01),but there were no significant differences between the groups(P>0.05).After ABMI,the white blood cell and platelets counts in both groups were significantly higher than before ABMI(P<0.01),and the counts in the intervention group were significantly higher than in the control group(P<0.01).After ABMI the CD4+and CD8+T cell counts in both groups were significantly higher than before ABMI(P<0.01).The CD8+T cell counts in the intervention group increased continuously and the increase had a shorter duration compared with control group.CONCLUSION ABMI through the portal vein in patients with DLC can significantly improve liver synthetic and secretory functions,and splenectomy promotes improvement of bone marrow hematopoietic and cellular immune functions.
