Quantum frontiers最新文献

{"title":"Group-theoretical study of band nodes and the emanating nodal structures in crystalline materials","authors":"F. Tang, Xiangang Wan","doi":"10.1007/s44214-024-00060-6","DOIUrl":"https://doi.org/10.1007/s44214-024-00060-6","url":null,"abstract":"","PeriodicalId":74629,"journal":{"name":"Quantum frontiers","volume":"29 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141926985","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":"<ArticleTitle xmlns:ns0=\"http://www.w3.org/1998/Math/MathML\">The origin of the large <ns0:math><ns0:msub><ns0:mi>T</ns0:mi> <ns0:mi>c</ns0:mi></ns0:msub> </ns0:math> variation in FeSe thin films probed by dual-beam pulsed laser deposition.","authors":"Zhongpei Feng, Hua Zhang, Jie Yuan, Xingyu Jiang, Xianxin Wu, Zhanyi Zhao, Qiuhao Xu, Valentin Stanev, Qinghua Zhang, Huaixin Yang, Lin Gu, Sheng Meng, Suming Weng, Qihong Chen, Ichiro Takeuchi, Kui Jin, Zhongxian Zhao","doi":"10.1007/s44214-024-00058-0","DOIUrl":"10.1007/s44214-024-00058-0","url":null,"abstract":"<p><p>FeSe is one of the most enigmatic superconductors. Among the family of iron-based compounds, it has the simplest chemical makeup and structure, and yet it displays superconducting transition temperature ( <math><msub><mi>T</mi> <mtext>c</mtext></msub> </math> ) spanning 0 to 15 K for thin films, while it is typically 8 K for single crystals. This large variation of <math><msub><mi>T</mi> <mtext>c</mtext></msub> </math> within one family underscores a key challenge associated with understanding superconductivity in iron chalcogenides. Here, using a dual-beam pulsed laser deposition (PLD) approach, we have fabricated a unique lattice-constant gradient thin film of FeSe which has revealed a clear relationship between the atomic structure and the superconducting transition temperature for the first time. The dual-beam PLD that generates laser fluence gradient inside the plasma plume has resulted in a continuous variation in distribution of edge dislocations within a single film, and a precise correlation between the lattice constant and <math><msub><mi>T</mi> <mtext>c</mtext></msub> </math> has been observed here, namely, <math><msub><mi>T</mi> <mtext>c</mtext></msub> <mo>∝</mo> <msqrt><mrow><mi>c</mi> <mo>-</mo> <msub><mi>c</mi> <mn>0</mn></msub> </mrow> </msqrt> </math> , where <i>c</i> is the <i>c</i>-axis lattice constant (and <math><msub><mi>c</mi> <mn>0</mn></msub> </math> is a constant). This explicit relation in conjunction with a theoretical investigation indicates that it is the shifting of the <math><msub><mi>d</mi> <mtext>xy</mtext></msub> </math> orbital of Fe which plays a governing role in the interplay between nematicity and superconductivity in FeSe.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at 10.1007/s44214-024-00058-0.</p>","PeriodicalId":74629,"journal":{"name":"Quantum frontiers","volume":"3 1","pages":"12"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11161545/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141297511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large positive magnetoresistance and high mobility in topological insulator candidate LaP","authors":"Desheng Wu, Jianlin Luo","doi":"10.1007/s44214-023-00038-w","DOIUrl":"https://doi.org/10.1007/s44214-023-00038-w","url":null,"abstract":"Abstract We reported herein the single crystal growth and the comprehensive study of basic physical properties including electronic transport, magnetic, specific heat of topological insulator candidate LaP. Single crystal LaP of rock salt type structure was synthesized by Sn flux method. Under low temperature and high magnetic field of $T= 2$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mi>T</mml:mi> <mml:mo>=</mml:mo> <mml:mn>2</mml:mn> </mml:math> K and $B= 9$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mi>B</mml:mi> <mml:mo>=</mml:mo> <mml:mn>9</mml:mn> </mml:math> T, large positive magnetoresistance (LMR) of 500% was discovered. The Hall effect measurements show that the conduction carriers are dominated by holes among the temperature range from 300 K to 2 K, the carrier concentration $n_{h} =4.94times 10^{19}$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msub> <mml:mi>n</mml:mi> <mml:mi>h</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>4.94</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>19</mml:mn> </mml:mrow> </mml:msup> </mml:math> cm −3 and $n_{e} =5.02times 10^{16}$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msub> <mml:mi>n</mml:mi> <mml:mi>e</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>16</mml:mn> </mml:mrow> </mml:msup> </mml:math> cm −3 and the mobility of LaP reached as high as $mu _{h}=1.57times 10^{4}$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msub> <mml:mi>μ</mml:mi> <mml:mi>h</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>1.57</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>4</mml:mn> </mml:mrow> </mml:msup> </mml:math> cm 2 V −1 S −1 and $mu _{e} = 1.55times 10^{3}$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msub> <mml:mi>μ</mml:mi> <mml:mi>e</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>1.55</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:msup> </mml:math> cm 2 V −1 S −1 obtained at 2 K, which can be explained by multiband model physics like other topological quantum material systems with large MR. LaP shows diamagnetism over a wide temperature range from 2 K to 300 K without any magnetic phase transition by susceptibility measurements. No evidence of phase transitions from 2 K to 300 K was observed in the specific heat measurement. The electronic specific heat coefficient is obtained 0.538 m J mol −1 K −2 for LaP single crystal, which responds to a small electron density state near the Fermi level. Our results would be helpful in renewing interest in studying emergent phenomena arisen from topological semimetals. LaP offers a platform for understanding the interactions between large magnetoresistance, high mobility an","PeriodicalId":74629,"journal":{"name":"Quantum frontiers","volume":"119 33","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135137158","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":"Controllable phase transition of two-dimensional ferromagnetic chromium telluride thin films grown by molecular beam epitaxy","authors":"Haili Huang, Jinbo Shen, Jiayi Chen, Qia Shen, Gaoting Lin, Zhen Zhu, Jiangtao Wu, Jie Ma, Hao Yang, Xiaoxue Liu, Liang Liu, Dandan Guan, Shiyong Wang, Yaoyi Li, Canhua Liu, Hao Zheng, Yunhao Lu, Jinfeng Jia","doi":"10.1007/s44214-023-00037-x","DOIUrl":"https://doi.org/10.1007/s44214-023-00037-x","url":null,"abstract":"Abstract Two-dimensional (2D) Cr (1+ δ ) Te 2 materials exhibit strong magnetic ordering and high Curie temperatures, making them attractive for various applications. It is crucial to achieve controllable synthesis for their successful integration into device technologies. In this study, we present the synthesis of phase-controllable 2D Cr (1+ δ ) Te 2 films on the Si (111) substrate via molecular beam epitaxy. The composition and phase transition of the as-grown Cr (1+ δ ) Te 2 films are characterized by using in-situ reflection high-energy electron diffraction, scanning tunneling microscopy, ex-situ X-ray photoelectron spectroscopy, X-ray diffraction, and theoretical calculations. At low growth temperatures, by carefully adjusting the film thickness from 2 to more than 3 layers, we achieve precise control over the phase of Cr (1+ δ ) Te 2 , from CrTe 2 to Cr intercalated Cr 2 Te 3 . At a relatively elevated growth temperature, it is demonstrated that the Cr (1+ δ ) Te 2 phase is independent of the film thickness, only Cr 2 Te 3 forms and its growth mode is thickness-dependent. These phase transitions at low growth temperatures and growth mode changes at elevated growth temperatures are attributed to interfacial effects and the phase stability of Cr (1+ δ ) Te 2 compounds. Additionally, we utilize scanning tunneling spectroscopy and computations to gain insights into the electronic properties of Cr 2 Te 3 . The magnetic measurements reveal that the 30-nm Cr 2 Te 3 film exhibits ferromagnetic behavior with a Curie temperature of about 180 K. Our work offers a robust method for the controllable growth of high-quality 2D Cr (1+ δ ) Te 2 films on Si substrates, providing an ideal platform for investigating their intrinsic properties and advancing the development of 2D magnet-based spintronics devices.","PeriodicalId":74629,"journal":{"name":"Quantum frontiers","volume":"176 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135321432","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":"Interface-enhanced superconductivity in monolayer 1T′-MoTe2 on SrTiO3(001)","authors":"Bo Yang, Chenxiao Zhao, B. Xia, Haiyang Ma, Hongyuan Chen, Jie Cai, Hao Yang, Xiaoxue Liu, Liang Liu, D. Guan, Shiyong Wang, Yaoyi Li, Canhua Liu, Hao Zheng, Jinfeng Jia","doi":"10.1007/s44214-023-00034-0","DOIUrl":"https://doi.org/10.1007/s44214-023-00034-0","url":null,"abstract":"","PeriodicalId":74629,"journal":{"name":"Quantum frontiers","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47207635","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":"Ferromagnetic and insulating behavior in both half magnetic levitation and non-levitation LK-99 like samples","authors":"Pinyuan Wang, Xiaoqi Liu, Jun Ge, Chen Ji, Haoran Ji, Yanzhao Liu, Yiwen Ai, Gaoxing Ma, S. Qi, Jian Wang","doi":"10.1007/s44214-023-00035-z","DOIUrl":"https://doi.org/10.1007/s44214-023-00035-z","url":null,"abstract":"","PeriodicalId":74629,"journal":{"name":"Quantum frontiers","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45600219","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":"Correction: Topological superconductivity in multifold fermion metals","authors":"Zheshen Gao, Xue-Jian Gao, Wen-Yu He, Xiao Yan Xu, T. Ng, K. T. Law","doi":"10.1007/s44214-023-00032-2","DOIUrl":"https://doi.org/10.1007/s44214-023-00032-2","url":null,"abstract":"","PeriodicalId":74629,"journal":{"name":"Quantum frontiers","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42598906","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":"Correction: Some questions concerning Majorana fermions in 2D (p+ip) Fermi superfluids","authors":"Yiruo Lin, A. Leggett","doi":"10.1007/s44214-023-00033-1","DOIUrl":"https://doi.org/10.1007/s44214-023-00033-1","url":null,"abstract":"","PeriodicalId":74629,"journal":{"name":"Quantum frontiers","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49591268","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":"Magnetic bulk photovoltaic effect as a probe of magnetic structures of $mathrm{{EuSn_{2}As_{2}}}$","authors":"H. Pi, Shuai Zhang, H. Weng","doi":"10.1007/s44214-023-00029-x","DOIUrl":"https://doi.org/10.1007/s44214-023-00029-x","url":null,"abstract":"","PeriodicalId":74629,"journal":{"name":"Quantum frontiers","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46567867","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":"Magnetic field orientation dependence of planar tunneling spectroscopy in the superconducting state of NbSe2","authors":"Yuantao Ji, Zehao Dong, Hao Wang, Qingyang Li, S. Ye, Zhi-En Gao, Zhenqi Hao, Yayu Wang","doi":"10.1007/s44214-023-00031-3","DOIUrl":"https://doi.org/10.1007/s44214-023-00031-3","url":null,"abstract":"","PeriodicalId":74629,"journal":{"name":"Quantum frontiers","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42676610","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}