M. Förstel, Nima‐Noah Nahvi, Kai Pollow, T. Studemund, Alice E. Green, A. Fielicke, S. Mackenzie, O. Dopfer
{"title":"Front Cover: The impact of optical excitation on the binding in complexes of the cationic gold dimer: Au\u0000 2\u0000 +\u0000 N\u0000 2\u0000 and Au\u0000 2\u0000 +\u0000 N\u0000 2\u0000 O","authors":"M. Förstel, Nima‐Noah Nahvi, Kai Pollow, T. Studemund, Alice E. Green, A. Fielicke, S. Mackenzie, O. Dopfer","doi":"10.1002/ntls.202310001","DOIUrl":"https://doi.org/10.1002/ntls.202310001","url":null,"abstract":"","PeriodicalId":74244,"journal":{"name":"Natural sciences (Weinheim, Germany)","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77314778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Review of “Molecules in superfluid helium nanodroplets: Spectroscopy, structure, and dynamics,” edited by Alkwin Slenczka and Jan Peter Toennies, Volume 145, Topics in Applied Physics, Springer Publishing Co., New York, 2022","authors":"D. Pratt","doi":"10.1002/ntls.20220063","DOIUrl":"https://doi.org/10.1002/ntls.20220063","url":null,"abstract":"","PeriodicalId":74244,"journal":{"name":"Natural sciences (Weinheim, Germany)","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78945650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We theoretically studied the phonon properties of the triangular-, stripe- and honeycomb-type electronic crystals recently found in two-dimensional semiconductor moir'e patterns. By analyzing the phonon dispersions, we found the interaction induced lattice deformation in the zigzag-stripe crystal results in a much higher dynamical stability than in the linear-stripe crystal. Moreover, chiral phonons with finite magnetizations and large Berry curvatures can emerge in triangular and honeycomb crystals under time-reversal or inversion symmetry breaking. The small effective mass of the electrons allows the selective and efficient generation of chiral phonons from the optical activity of zone-center phonons combined with the anharmonicity, facilitating the realization of the phonon Hall effect. These findings point to an exciting new platform for exploring chiral phonons and the related topological phononic devices.
{"title":"Phonons of electronic crystals in two‐dimensional semiconductor moiré patterns","authors":"Hongyi Yu, Jiyong Zhou","doi":"10.1002/ntls.20220065","DOIUrl":"https://doi.org/10.1002/ntls.20220065","url":null,"abstract":"We theoretically studied the phonon properties of the triangular-, stripe- and honeycomb-type electronic crystals recently found in two-dimensional semiconductor moir'e patterns. By analyzing the phonon dispersions, we found the interaction induced lattice deformation in the zigzag-stripe crystal results in a much higher dynamical stability than in the linear-stripe crystal. Moreover, chiral phonons with finite magnetizations and large Berry curvatures can emerge in triangular and honeycomb crystals under time-reversal or inversion symmetry breaking. The small effective mass of the electrons allows the selective and efficient generation of chiral phonons from the optical activity of zone-center phonons combined with the anharmonicity, facilitating the realization of the phonon Hall effect. These findings point to an exciting new platform for exploring chiral phonons and the related topological phononic devices.","PeriodicalId":74244,"journal":{"name":"Natural sciences (Weinheim, Germany)","volume":"87 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91302300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Pseudo‐embryology and personhood: How embryological pseudoscience helps structure the American abortion debate","authors":"S. Gilbert","doi":"10.1002/ntls.20220041","DOIUrl":"https://doi.org/10.1002/ntls.20220041","url":null,"abstract":"","PeriodicalId":74244,"journal":{"name":"Natural sciences (Weinheim, Germany)","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83662020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ke Xiao, Ruihuan Duan, Zheng Liu, Kenji Watanabe, T. Taniguchi, W. Yao, X. Cui
Hot excitons are usually neglected in optical spectroscopy in 2D semiconductors for the sake of momentum conservation, as the majority of hot excitons are out of light cones. In this letter, we elaborate the contribution of hot excitons to optical properties of monolayer MoSe2 with photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopy. With the excitation-intensity-dependent PL, temperature-dependent PL and PLE experiments combined with the simulations, we experimentally distinguish the influences of the exciton temperature and the lattice temperature in the PL spectrum. It is concluded that the acoustic phonon assisted photoluminescence accounts for the non-Lorentzian high energy tail in the PL spectrum and the hot exciton effect is significant to linear optical properties of TMDs. Besides, the effective exciton temperature is found to be several tens of Kelvin higher than the lattice temperature at non-resonant optical excitation. It indicates that the exciton temperature needs to be carefully taken into account when considering the exciton related quantum phase phenomena such as exciton condensation. It is experimentally demonstrated that the effective exciton temperature can be tuned by excitation energy.
{"title":"Hot exciton effect in photoluminescence of monolayer transition metal dichalcogenide","authors":"Ke Xiao, Ruihuan Duan, Zheng Liu, Kenji Watanabe, T. Taniguchi, W. Yao, X. Cui","doi":"10.1002/ntls.20220035","DOIUrl":"https://doi.org/10.1002/ntls.20220035","url":null,"abstract":"Hot excitons are usually neglected in optical spectroscopy in 2D semiconductors for the sake of momentum conservation, as the majority of hot excitons are out of light cones. In this letter, we elaborate the contribution of hot excitons to optical properties of monolayer MoSe2 with photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopy. With the excitation-intensity-dependent PL, temperature-dependent PL and PLE experiments combined with the simulations, we experimentally distinguish the influences of the exciton temperature and the lattice temperature in the PL spectrum. It is concluded that the acoustic phonon assisted photoluminescence accounts for the non-Lorentzian high energy tail in the PL spectrum and the hot exciton effect is significant to linear optical properties of TMDs. Besides, the effective exciton temperature is found to be several tens of Kelvin higher than the lattice temperature at non-resonant optical excitation. It indicates that the exciton temperature needs to be carefully taken into account when considering the exciton related quantum phase phenomena such as exciton condensation. It is experimentally demonstrated that the effective exciton temperature can be tuned by excitation energy.","PeriodicalId":74244,"journal":{"name":"Natural sciences (Weinheim, Germany)","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78372613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Adarsh Koovakattil Surendran, Guilherme L. Tripodi, Eva Pluhařová, A. Pereverzev, J. P. Bruekers, J. Elemans, E. Meijer, J. Roithová
{"title":"Host‐guest tuning of the CO\u0000 2\u0000 reduction activity of an iron porphyrin cage","authors":"Adarsh Koovakattil Surendran, Guilherme L. Tripodi, Eva Pluhařová, A. Pereverzev, J. P. Bruekers, J. Elemans, E. Meijer, J. Roithová","doi":"10.1002/ntls.20220019","DOIUrl":"https://doi.org/10.1002/ntls.20220019","url":null,"abstract":"","PeriodicalId":74244,"journal":{"name":"Natural sciences (Weinheim, Germany)","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77252076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The path to condensates—19th Wiley Prize in Biomedical Sciences laureates share their discovery stories","authors":"C. Brangwynne, A. Hyman, M. Rosen","doi":"10.1002/ntls.20210091","DOIUrl":"https://doi.org/10.1002/ntls.20210091","url":null,"abstract":"","PeriodicalId":74244,"journal":{"name":"Natural sciences (Weinheim, Germany)","volume":"320 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83917429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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