arXiv - PHYS - Other Condensed Matter最新文献_第6页

Coexistence of Topological Dirac and Dirac Nodal line semimetal in SrCaP belonging to Nodal line semimetal family SrCaX(X= Bi, Sb, As, P) 属于 Nodal line semimetal family SrCaX（X= Bi、Sb、As、P）的 SrCaP 中拓扑狄拉克和狄拉克 Nodal line semimetal 的共存现象

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-06-06 DOI: arxiv-2406.03952

Shivendra Kumar Gupta, Ashish Kore, Saurabh Kumar Sen, Poorva Singh

{"title":"Coexistence of Topological Dirac and Dirac Nodal line semimetal in SrCaP belonging to Nodal line semimetal family SrCaX(X= Bi, Sb, As, P)","authors":"Shivendra Kumar Gupta, Ashish Kore, Saurabh Kumar Sen, Poorva Singh","doi":"arxiv-2406.03952","DOIUrl":"https://doi.org/arxiv-2406.03952","url":null,"abstract":"Nodal line semimetals represent precursor states for various topological\u0000phases, exhibiting intrinsic topological characteristics and intriguing\u0000properties. These materials host rare and distinctive topological features,\u0000which can give rise to exotic phenomena, thereby garnering significant\u0000attention in both fundamental research and technological applications. In this\u0000study, we conduct ab-initio calculations to explore the properties of SrCaX (X\u0000= Bi, Sb, As, P), identifying these as multiple Dirac nodal line semimetals\u0000protected by Z2 quantized Berry phases and manifesting multiple drum-head-like\u0000surface states. The nodal lines in these compounds are situated at the M point\u0000when kz = 0 and at the A point when kz = {pi}. Notably, SrCaX family exhibits\u0000a unique characteristic wherein they host both type II Dirac point and\u0000topological nodal line semimetal within a single crystal structure, hence\u0000providing an excellent platform for studying the interplay between different\u0000topological properties. Additionally, in SrCaP topological Dirac semimetal,\u0000Type II Dirac point and topological nodal line semimetal features coexist in a\u0000single crystal. These special features in this series of materials make them\u0000ideal candidates for further investigation by experimental means.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141520117","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}

引用次数: 0

Stoichiometry-induced ferromagnetism in altermagnetic candidate MnTe 变磁性候选材料锰碲中由化学计量引发的铁磁性

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-06-06 DOI: arxiv-2406.04474

Michael Chilcote, Alessandro R. Mazza, Qiangsheng Lu, Isaiah Gray, Qi Tian, Qinwen Deng, Duncan Moseley, An-Hsi Chen, Jason Lapano, Jason S. Gardner, Gyula Eres, T. Zac Ward, Erxi Feng, Huibo Cao, Valeria Lauter, Michael A. McGuire, Raphael Hermann, David Parker, Myung-Geun Han, Asghar Kayani, Gaurab Rimal, Liang Wu, Timothy R. Charlton, Robert G. Moore, Matthew Brahlek

{"title":"Stoichiometry-induced ferromagnetism in altermagnetic candidate MnTe","authors":"Michael Chilcote, Alessandro R. Mazza, Qiangsheng Lu, Isaiah Gray, Qi Tian, Qinwen Deng, Duncan Moseley, An-Hsi Chen, Jason Lapano, Jason S. Gardner, Gyula Eres, T. Zac Ward, Erxi Feng, Huibo Cao, Valeria Lauter, Michael A. McGuire, Raphael Hermann, David Parker, Myung-Geun Han, Asghar Kayani, Gaurab Rimal, Liang Wu, Timothy R. Charlton, Robert G. Moore, Matthew Brahlek","doi":"arxiv-2406.04474","DOIUrl":"https://doi.org/arxiv-2406.04474","url":null,"abstract":"The field of spintronics has seen a surge of interest in altermagnetism due\u0000to novel predictions and many possible applications. MnTe is a leading\u0000altermagnetic candidate that is of significant interest across spintronics due\u0000to its layered antiferromagnetic structure, high Neel temperature (TN ~ 310 K)\u0000and semiconducting properties. We present results on molecular beam epitaxy\u0000(MBE) grown MnTe/InP(111) films. Here, it is found that the electronic and\u0000magnetic properties are driven by the natural stoichiometry of MnTe. Electronic\u0000transport and in situ angle-resolved photoemission spectroscopy show the films\u0000are natively metallic with the Fermi level in the valence band and the band\u0000structure is in good agreement with first principles calculations for\u0000altermagnetic spin-splitting. Neutron diffraction confirms that the film is\u0000antiferromagnetic with planar anisotropy and polarized neutron reflectometry\u0000indicates weak ferromagnetism, which is linked to a slight Mn-richness that is\u0000intrinsic to the MBE grown samples. When combined with the anomalous Hall\u0000effect, this work shows that the electronic response is strongly affected by\u0000the ferromagnetic moment. Altogether, this highlights potential mechanisms for\u0000controlling altermagnetic ordering for diverse spintronic applications.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500872","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}

引用次数: 0

Direct observation of the vanishing EELS cross section in graphene 直接观察石墨烯中消失的 EELS 截面

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-06-05 DOI: arxiv-2406.02998

Alberto Guandalini, Ryosuke Senga, Yung-Chang Lin, Kazu Suenaga, Paolo Barone, Francesco Mauri, Thomas Pichler, Christian Kramberger

引用次数: 0

Memory effects on the current induced propagation of spin textures in NdCo$_5$/Ni$_8$Fe$_2$ bilayers 电流诱导自旋纹理在钕钴元_5元/镍元_8元铁元_2元双层膜中传播的记忆效应

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-06-03 DOI: arxiv-2406.01091

Victoria Vega Fernández, Alicia Estela Herguedas-Alonso, Javier Hermosa, Lucía Aballe, Andrea Sorrentino, Ricardo Valcarcel, Carlos Quiros, Jose Ignacio Martín, Eva Pereiro, Salvador Ferrer, Aurelio Hierro-Rodríguez, María Vélez

{"title":"Memory effects on the current induced propagation of spin textures in NdCo$_5$/Ni$_8$Fe$_2$ bilayers","authors":"Victoria Vega Fernández, Alicia Estela Herguedas-Alonso, Javier Hermosa, Lucía Aballe, Andrea Sorrentino, Ricardo Valcarcel, Carlos Quiros, Jose Ignacio Martín, Eva Pereiro, Salvador Ferrer, Aurelio Hierro-Rodríguez, María Vélez","doi":"arxiv-2406.01091","DOIUrl":"https://doi.org/arxiv-2406.01091","url":null,"abstract":"Bilayers of NdCo$_5$/Ni$_8$Fe$_2$ can act as reconfigurable racetracks thanks\u0000to the parallel stripe domain configuration present in the hard magnetic\u0000material with weak perpendicular anisotropy (NdCo$_5$), and its imprint on the\u0000soft magnetic layer (Ni$_8$Fe$_2$). This pattern hosts spin textures with well\u0000defined topological charges and establishes paths for their deterministic\u0000propagation under the effect of pulsed currents, which has been studied as a\u0000function of externally applied fields by using Magnetic Transmission X-ray\u0000Microscopy. The experiments show guided vortex/antivortex propagation events\u0000within the Ni$_8$Fe$_2$ above a threshold current of $3cdot10^{11}$ A/m$^2$.\u0000Opposite propagation senses have been observed depending on the topological\u0000charge of the spin texture, both in the remnant state and under an applied\u0000external field. Micromagnetic simulations of our multilayer reveal that the\u0000guiding effect and asymmetric propagation sense are due to the magnetic history\u0000of the hard magnetic layer. An exchange-bias-based memory effect acts as a\u0000magnetic spring and controls the propagation sense by favoring a specific\u0000orientation of the in plane magnetization, leading to a system which behaves as\u0000a hard-soft magnetic composite with reconfigurable capabilities for a\u0000controlled propagation of magnetic topological textures.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256505","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}

引用次数: 0

Nonreciprocal singularities dominated by the dissipative photon-magnon coupling in non-Hermitian systems 非赫米提系统中耗散光磁耦合主导的非互易奇点

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-05-28 DOI: arxiv-2405.17869

Yongzhang Shi, Chi Zhang, Zhenhui Hao, Changjun Jiang, C. K. Ong, Guozhi Chai

引用次数: 0

Enhanced fractional quantum Hall gaps in a two-dimensional electron gas coupled to a hovering split-ring resonator 耦合到悬浮分环谐振器的二维电子气中的增强型分数量子霍尔隙

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-05-28 DOI: arxiv-2405.18362

Josefine Enkner, Lorenzo Graziotto, Dalin Boriçi, Felice Appugliese, Christian Reichl, Giacomo Scalari, Nicolas Regnault, Werner Wegscheider, Cristiano Ciuti, Jérôme Faist

{"title":"Enhanced fractional quantum Hall gaps in a two-dimensional electron gas coupled to a hovering split-ring resonator","authors":"Josefine Enkner, Lorenzo Graziotto, Dalin Boriçi, Felice Appugliese, Christian Reichl, Giacomo Scalari, Nicolas Regnault, Werner Wegscheider, Cristiano Ciuti, Jérôme Faist","doi":"arxiv-2405.18362","DOIUrl":"https://doi.org/arxiv-2405.18362","url":null,"abstract":"The magnetotransport of a high-mobility two-dimensional electron gas coupled\u0000to a hovering split-ring resonator with controllable distance is studied in the\u0000quantum Hall regime. The measurements reveal an enhancement by more than a\u0000factor 2 of the quantum Hall energy gaps at the fractional filling factors 4/3,\u00005/3, and 7/5, alongside a concurrent reduction in exchange splitting at odd\u0000integer filling factors. Theoretically, we show the strength of both effects to\u0000be quantitatively compatible with the emergence of an effective\u0000electron-electron long-range attractive interaction mediated by the exchange of\u0000virtual cavity photons in the presence of significant spatial gradients of the\u0000cavity electric vacuum fields. These results unveil a compelling interplay\u0000between cavity quantum electrodynamics and electronic correlations in\u0000two-dimensional systems, with profound implications for the manipulation and\u0000control of quantum phases in 2D materials.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"133 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141170798","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}

引用次数: 0

Determining Domain of Machine Learning Models using Kernel Density Estimates: Applications in Materials Property Prediction 使用核密度估计确定机器学习模型的领域：材料特性预测中的应用

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-05-28 DOI: arxiv-2406.05143

Lane E. Schultz, Yiqi Wang, Ryan Jacobs, Dane Morgan

{"title":"Determining Domain of Machine Learning Models using Kernel Density Estimates: Applications in Materials Property Prediction","authors":"Lane E. Schultz, Yiqi Wang, Ryan Jacobs, Dane Morgan","doi":"arxiv-2406.05143","DOIUrl":"https://doi.org/arxiv-2406.05143","url":null,"abstract":"Knowledge of the domain of applicability of a machine learning model is\u0000essential to ensuring accurate and reliable model predictions. In this work, we\u0000develop a new approach of assessing model domain and demonstrate that our\u0000approach provides accurate and meaningful designation of in-domain versus\u0000out-of-domain when applied across multiple model types and material property\u0000data sets. Our approach assesses the distance between a test and training data\u0000point in feature space by using kernel density estimation and shows that this\u0000distance provides an effective tool for domain determination. We show that\u0000chemical groups considered unrelated based on established chemical knowledge\u0000exhibit significant dissimilarities by our measure. We also show that high\u0000measures of dissimilarity are associated with poor model performance (i.e.,\u0000high residual magnitudes) and poor estimates of model uncertainty (i.e.,\u0000unreliable uncertainty estimation). Automated tools are provided to enable\u0000researchers to establish acceptable dissimilarity thresholds to identify\u0000whether new predictions of their own machine learning models are in-domain\u0000versus out-of-domain.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141531457","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}

引用次数: 0

Geodesic nature and quantization of shift vector 偏移矢量的测地性质和量化

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-05-22 DOI: arxiv-2405.13355

Hua Wang, Kai Chang

{"title":"Geodesic nature and quantization of shift vector","authors":"Hua Wang, Kai Chang","doi":"arxiv-2405.13355","DOIUrl":"https://doi.org/arxiv-2405.13355","url":null,"abstract":"Recently, Xu et al. introduced the concept of an interband character for a\u0000time-dependent quantum system. This quantity is gauge invariant and quantized\u0000as integer values, analogous to the Euler characteristic based on the\u0000Gauss-Bonnet theorem for a manifold with a smooth boundary. In this work, we\u0000find that the geometric shift vector in momentum space from shift currents in\u0000the bulk photovoltaic effect is equivalent to the quantum geometric potential\u0000and plays the role of geodesic curvature, that is, of a quantum system whose\u0000parameter space is the Bloch momentum. We reveal the intricate relationships\u0000among geometric quantities such as the shift vector, Berry curvature, and\u0000quantum metric. Additionally, we present the Wilson representation for the\u0000quantized interband character and extend our analysis to bosonic photon and\u0000phonon drag shift vectors with non-vertical transitions. The application of\u0000Wilson loop method facilitates first-principles calculations, providing\u0000insights into the geometric underpinnings of these interband gauge invariant\u0000quantities and shedding light on their nonlinear optical manifestations in real\u0000materials.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141146426","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}

引用次数: 0

Formation of Iron-Helium Compounds under High Pressure 高压下铁氦化合物的形成

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-05-20 DOI: arxiv-2405.11810

Haruki Takezawa, Han Hsu, Kei Hirose, Fumiya Sakai, Suyu Fu, Hitoshi Gomi

引用次数: 0

Mean-field and cumulant approaches to modelling organic polariton physics 有机极化子物理学建模的均场和累积方法

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-05-16 DOI: arxiv-2405.09812

Piper Fowler-Wright

{"title":"Mean-field and cumulant approaches to modelling organic polariton physics","authors":"Piper Fowler-Wright","doi":"arxiv-2405.09812","DOIUrl":"https://doi.org/arxiv-2405.09812","url":null,"abstract":"In this thesis we develop methods for many-body open quantum systems and\u0000apply them to systems of organic polaritons. The methods employ a mean-field\u0000approach to reduce the dimensionality of large-scale problems. Initially\u0000assuming the absence of correlations in the many-body state, this approach is\u0000built upon in two ways. First, we show how the mean-field approximation can be combined with matrix\u0000product operator methods to efficiently simulate the non-Markovian dynamics of\u0000a many-body system with strong coupling to multiple environments. We apply this\u0000method to calculate the threshold and photoluminescence for a realistic model\u0000of an organic laser. Second, we extend the mean-field description by systematically including\u0000higher-order correlations via cumulant expansions of the Heisenberg equations\u0000of motion. We investigate the validity and convergence properties of these\u0000expansions, both with respect to expansion order and system size, for many-body\u0000systems with many-to-one network structures. We then show how the cumulant\u0000expansions may be used to calculate spatially resolved dynamics of organic\u0000polaritons. This enables a study of organic polariton transport in which we\u0000observe reversible conversion to dark exciton states and sub-group-velocity\u0000propagation. The methods established in this work offer versatile tools for analysing\u0000large, many-body open quantum systems and investigating finite-size effects.\u0000Their application reveals the intricate dynamics of organic polaritons\u0000resulting from the interplay of strong light-matter coupling and vibrational\u0000effects.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141059901","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}

引用次数: 0