Research on two-dimensional(2D) materials has been explosively increasing in last seventeen years in varying subjects including condensed matter physics, electronic engineering, materials science, and chemistry since ...Research on two-dimensional(2D) materials has been explosively increasing in last seventeen years in varying subjects including condensed matter physics, electronic engineering, materials science, and chemistry since the mechanical exfoliation of graphene in 2004. Starting from graphene, 2D materials now have become a big family with numerous members and diverse categories. The unique structural features and physicochemical properties of 2D materials make them one class of the most appealing candidates for a wide range of potential applications. In particular, we have seen some major breakthroughs made in the field of 2D materials in last five years not only in developing novel synthetic methods and exploring new structures/properties but also in identifying innovative applications and pushing forward commercialisation. In this review, we provide a critical summary on the recent progress made in the field of 2D materials with a particular focus on last five years. After a brief backgroundintroduction, we first discuss the major synthetic methods for 2D materials, including the mechanical exfoliation, liquid exfoliation, vapor phase deposition, and wet-chemical synthesis as well as phase engineering of 2D materials belonging to the field of phase engineering of nanomaterials(PEN). We then introduce the superconducting/optical/magnetic properties and chirality of 2D materials along with newly emerging magic angle 2D superlattices. Following that, the promising applications of 2D materials in electronics, optoelectronics, catalysis, energy storage, solar cells, biomedicine, sensors, environments, etc. are described sequentially. Thereafter, we present the theoretic calculations and simulations of 2D materials. Finally, after concluding the current progress, we provide some personal discussions on the existing challenges and future outlooks in this rapidly developing field.展开更多
Optical control of magnons in two-dimensional(2D)materials promises new functionalities for spintronics and magnonics in atomically thin devices.Here,we report control of magnon dynamics,using laser polarization,in a ...Optical control of magnons in two-dimensional(2D)materials promises new functionalities for spintronics and magnonics in atomically thin devices.Here,we report control of magnon dynamics,using laser polarization,in a ferromagnetic van der Waals(vdW)material,Fe3.6Co1.4GeTe2.The magnon amplitude,frequency,and lifetime are controlled and monitored by time-resolved pump-probe spectroscopy.We show substantial(over 25%)and continuous modulation of magnon dynamics as a function of incident laser polarization.Our results suggest that the modification of the effective demagnetization field and magnetic anisotropy by the pump laser pulses with different polarizations is due to anisotropic optical absorption.This implies that pump laser pulses modify the local spin environment,which enables the launch of magnons with tunable dynamics.Our first-principles calculations confirm the anisotropic optical absorption of different crystal orientations.Our findings suggest a new route for the development of opto-spintronic or opto-magnonic devices.展开更多
New viral infections,due to their rapid spread,lack of effective antiviral drugs and vaccines,kill millions of people every year.The global pandemic SARS-CoV-2 in 2019-2021 has shown that new strains of viruses can wi...New viral infections,due to their rapid spread,lack of effective antiviral drugs and vaccines,kill millions of people every year.The global pandemic SARS-CoV-2 in 2019-2021 has shown that new strains of viruses can widespread very quickly,causing disease and death,with significant socio-economic consequences.Therefore,the search for new methods of combating different pathogenic viruses is an urgent task,and strategies based on nanoparticles are of significant interest.This work demonstrates the antiviral adsorption(virucidal)efficacy of nanoparticles of porous silicon(PSi NPs)against various enveloped and non-enveloped pathogenic human viruses,such as Influenza A virus,Poliovirus,Human immunodeficiency virus,West Nile virus,and Hepatitis virus.PSi NPs sized 60 nm with the average pore diameter of 2 nm and specific surface area of 200 m^(2)/g were obtained by ball-milling of electrochemically-etched microporous silicon films.After interaction with PSi NPs,a strong suppression of the infectious activity of the virus-contaminated fluid was observed,which was manifested in a decrease in the infectious titer of all studied types of viruses by approximately 104 times,and corresponded to an inactivation of 99.99%viruses in vitro.This sorption capacity of PSi NPs is possible due to their microporous structure and huge specific surface area,which ensures efficient capture of virions,as confirmed by ELISA analysis,dynamic light scattering measurements and transmission electron microscopy images.The results obtained indicate the great potential of using PSi NPs as universal viral sorbents and disinfectants for the detection and treatment of viral diseases.展开更多
The detection of orbital angular momentum usually relies on optical techniques,which modify the original beam to convert the information carried on its phase into a specific intensity distribution in output.Moreover,t...The detection of orbital angular momentum usually relies on optical techniques,which modify the original beam to convert the information carried on its phase into a specific intensity distribution in output.Moreover,the exploitation of high-intensity beams can result destructive for standard optical elements and setups.A recent publication suggests a solution to overcome all those limitations,by probing highly-intense vortex pulses with a structured reference beam in a strong-field photoionization process.展开更多
文摘Research on two-dimensional(2D) materials has been explosively increasing in last seventeen years in varying subjects including condensed matter physics, electronic engineering, materials science, and chemistry since the mechanical exfoliation of graphene in 2004. Starting from graphene, 2D materials now have become a big family with numerous members and diverse categories. The unique structural features and physicochemical properties of 2D materials make them one class of the most appealing candidates for a wide range of potential applications. In particular, we have seen some major breakthroughs made in the field of 2D materials in last five years not only in developing novel synthetic methods and exploring new structures/properties but also in identifying innovative applications and pushing forward commercialisation. In this review, we provide a critical summary on the recent progress made in the field of 2D materials with a particular focus on last five years. After a brief backgroundintroduction, we first discuss the major synthetic methods for 2D materials, including the mechanical exfoliation, liquid exfoliation, vapor phase deposition, and wet-chemical synthesis as well as phase engineering of 2D materials belonging to the field of phase engineering of nanomaterials(PEN). We then introduce the superconducting/optical/magnetic properties and chirality of 2D materials along with newly emerging magic angle 2D superlattices. Following that, the promising applications of 2D materials in electronics, optoelectronics, catalysis, energy storage, solar cells, biomedicine, sensors, environments, etc. are described sequentially. Thereafter, we present the theoretic calculations and simulations of 2D materials. Finally, after concluding the current progress, we provide some personal discussions on the existing challenges and future outlooks in this rapidly developing field.
基金Research reported in this publication was supported in part by the NSF and SC EPSCoR/IDeA Program under NSF Award#OIA-1655740(GEAR CRP 20-GC02,23-GC01)and NSF Award No.2030128,2110033supported in part by the US Department of Energy,Office of Science,Office of Workforce Development for Teachers and Scientists(WDTS)under the Visiting Faculty Program(VFP)+1 种基金support from the Air Force Office of Scientific Research under Award No.FA9550-22-1-0349 and National Science Foundation under Award No.DMR-2326944 and No.DMR-2340773the support from the program of Educational Department of Liaoning Province(grant no.LQGD2020008).
文摘Optical control of magnons in two-dimensional(2D)materials promises new functionalities for spintronics and magnonics in atomically thin devices.Here,we report control of magnon dynamics,using laser polarization,in a ferromagnetic van der Waals(vdW)material,Fe3.6Co1.4GeTe2.The magnon amplitude,frequency,and lifetime are controlled and monitored by time-resolved pump-probe spectroscopy.We show substantial(over 25%)and continuous modulation of magnon dynamics as a function of incident laser polarization.Our results suggest that the modification of the effective demagnetization field and magnetic anisotropy by the pump laser pulses with different polarizations is due to anisotropic optical absorption.This implies that pump laser pulses modify the local spin environment,which enables the launch of magnons with tunable dynamics.Our first-principles calculations confirm the anisotropic optical absorption of different crystal orientations.Our findings suggest a new route for the development of opto-spintronic or opto-magnonic devices.
基金The research was funded by the Russian Science Foundation(Grant number 20-12-00297).
文摘New viral infections,due to their rapid spread,lack of effective antiviral drugs and vaccines,kill millions of people every year.The global pandemic SARS-CoV-2 in 2019-2021 has shown that new strains of viruses can widespread very quickly,causing disease and death,with significant socio-economic consequences.Therefore,the search for new methods of combating different pathogenic viruses is an urgent task,and strategies based on nanoparticles are of significant interest.This work demonstrates the antiviral adsorption(virucidal)efficacy of nanoparticles of porous silicon(PSi NPs)against various enveloped and non-enveloped pathogenic human viruses,such as Influenza A virus,Poliovirus,Human immunodeficiency virus,West Nile virus,and Hepatitis virus.PSi NPs sized 60 nm with the average pore diameter of 2 nm and specific surface area of 200 m^(2)/g were obtained by ball-milling of electrochemically-etched microporous silicon films.After interaction with PSi NPs,a strong suppression of the infectious activity of the virus-contaminated fluid was observed,which was manifested in a decrease in the infectious titer of all studied types of viruses by approximately 104 times,and corresponded to an inactivation of 99.99%viruses in vitro.This sorption capacity of PSi NPs is possible due to their microporous structure and huge specific surface area,which ensures efficient capture of virions,as confirmed by ELISA analysis,dynamic light scattering measurements and transmission electron microscopy images.The results obtained indicate the great potential of using PSi NPs as universal viral sorbents and disinfectants for the detection and treatment of viral diseases.
文摘The detection of orbital angular momentum usually relies on optical techniques,which modify the original beam to convert the information carried on its phase into a specific intensity distribution in output.Moreover,the exploitation of high-intensity beams can result destructive for standard optical elements and setups.A recent publication suggests a solution to overcome all those limitations,by probing highly-intense vortex pulses with a structured reference beam in a strong-field photoionization process.
