Journal of Physics: Condensed Matter最新文献_第2页

The initial stages of silver fluorination: a scanning tunneling microscopy investigation. 氟化银的初始阶段：扫描隧道显微镜研究。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-04-07 DOI: 10.1088/1361-648X/adc649

Jazmín Aragón Sánchez, Antonio Caporale, Ilya Degtev, Luciana Di Gaspare, Luca Persichetti, Maurizio Sansotera, Adrián Gómez Pueyo, Monica De Seta, José Lorenzana, Luca Camilli

{"title":"The initial stages of silver fluorination: a scanning tunneling microscopy investigation.","authors":"Jazmín Aragón Sánchez, Antonio Caporale, Ilya Degtev, Luciana Di Gaspare, Luca Persichetti, Maurizio Sansotera, Adrián Gómez Pueyo, Monica De Seta, José Lorenzana, Luca Camilli","doi":"10.1088/1361-648X/adc649","DOIUrl":"10.1088/1361-648X/adc649","url":null,"abstract":"We use low-temperature scanning tunneling microscopy (LT-STM) to characterize the early stages of silver fluorination. On Ag(100), we observe only one adsorbate species, which shows a bias-dependent STM topography. Notably, at negative bias voltages,VB<0, the apparent shape can be described as a round protrusion surrounded by a moat-like depression (sombrero). As the voltage increases, the apparent shape changes, eventually evolving into a round depression. From the STM images, we determine the adsorption site to be the hollow position. On Ag(110) we find adsorbates with three distinct STM topographies. One type exhibits the same shape change withVBas observed on Ag(100), that is, from asombreroshape to a round depression as the voltage changes from negative to positive values; the other two types are observed as round depressions regardless ofVB. From the STM images, we find the three adsorbates to be sitting on the short-bridge, hollow and top position on the Ag(110) surface, with a relative abundance of 60%, 35% and 5%.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143730602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Role of electron-electron interaction in the Mpemba effect in quantum dots. 电子-电子相互作用在量子点的姆彭巴效应中的作用

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-04-07 DOI: 10.1088/1361-648X/adc3e3

Juliane Graf, Janine Splettstoesser, Juliette Monsel

{"title":"Role of electron-electron interaction in the Mpemba effect in quantum dots.","authors":"Juliane Graf, Janine Splettstoesser, Juliette Monsel","doi":"10.1088/1361-648X/adc3e3","DOIUrl":"10.1088/1361-648X/adc3e3","url":null,"abstract":"The Mpemba effect has initially been noticed in macroscopic systems-namely that hot water can freeze faster than cold water-but recently its extension to open quantum systems has attracted significant attention. This phenomenon can be explained in the context of nonequilibrium thermodynamics of Markovian systems, relying on the amplitudes of different decay modes of the system dynamics. Here, we study the Mpemba effect in a single-level quantum dot coupled to a thermal bath, highlighting the role of the sign and magnitude of the electron-electron interaction in the occurrence of the Mpemba effect. We gain physical insights into the decay modes from a dissipative symmetry of this system called fermionic duality. Based on this analysis of the relaxation to equilibrium of the dot, we derive criteria for the occurrence of the Mpemba effect using two thermodynamically relevant measures of the distance to equilibrium, the nonequilibrium free energy and the dot energy. We furthermore compare this effect to a possible exponential speedup of the relaxation. Finally, we propose experimentally relevant schemes for the state preparation and explore different ways of observing the Mpemba effect in quantum dots in experiments.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143673440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Edge disorder and magnetism in graphene nanoribbons: an inverse modelling approach. 石墨烯纳米带的边缘无序性和磁性：一种逆建模方法。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-04-07 DOI: 10.1088/1361-648X/adc52c

Shardul Mukim, Meric E Kucukbas, Stephen R Power, Mauro S Ferreira

{"title":"Edge disorder and magnetism in graphene nanoribbons: an inverse modelling approach.","authors":"Shardul Mukim, Meric E Kucukbas, Stephen R Power, Mauro S Ferreira","doi":"10.1088/1361-648X/adc52c","DOIUrl":"10.1088/1361-648X/adc52c","url":null,"abstract":"It is difficult to completely eliminate disorder during the fabrication of graphene-based nanodevices. From a simulation perspective, it is straightforward to determine the electronic transport properties of disordered devices if complete information about the disorder and the Hamiltonian describing it is available. However, to do the reverse and determine information about the nature of the disorder purely from transport measurements is a far more difficult task. In this work, we apply a recently developed inversion technique to identify important structural information about edge-disordered zigzag graphene nanoribbons. The inversion tool decodes the electronic transmission spectrum to obtain the overall level of edge vacancies in this type of device. We also consider the role of spin-polarised states at the ribbon edges and demonstrate that, in addition to edge roughness, the inversion procedure can also be used to detect the presence of magnetism in such nanoribbons. We finally show that if the transmission for both spin orientations is available, for example by using ferromagnetic contacts in a transport measurement, then additional structural information about the relative concentration of defects on each edge can be derived.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143710388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strain tuning of the nonlinear anomalous Hall effect inMoS2monolayer. 二硫化钼单层中非线性反常霍尔效应的应变调谐。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-04-07 DOI: 10.1088/1361-648X/adc64a

Yuebei Xiong, Zhirui Gong, Hao Jin

引用次数: 0

Unlocking magnetic ferro-rotational functionalities. 解锁铁磁旋转功能。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-04-07 DOI: 10.1088/1361-648X/adc5c3

Junjie Yang, Fei-Ting Huang, Sang-Wook Cheong

{"title":"Unlocking magnetic ferro-rotational functionalities.","authors":"Junjie Yang, Fei-Ting Huang, Sang-Wook Cheong","doi":"10.1088/1361-648X/adc5c3","DOIUrl":"10.1088/1361-648X/adc5c3","url":null,"abstract":"Ferro-rotation (FR) phenomena-arising from intrinsic crystallographic rotational distortions-have only recently gained significant attention, despite the long-known presence of FR distortions in various compounds. Such phenomena include multiferroicity linked to helical spin order and electric field-induced optical activity. However, the broader relationship between FR and magnetic ordering remains largely unexplored and poorly understood. This study delves into the interplay between magnetic order and FR identifies potential materials capable of hosting magnetic FR and explores the interaction between magnetic FR and external stimuli. Our analysis reveals that out of the 122 magnetic point groups, 43 of them exhibit magnetic FR. Materials belonging to these magnetic point groups hold promise for demonstrating magnetic order-induced FR. Notably, the combination of parity/time reversal-odd antiferromagnetic order and FR can lead to the emergence of directionally nonreciprocal spin waves, as exemplified in MnTiO3. Moreover, our investigation uncovers novel magnetic order-induced switchable chirality, when magnetic FR objects are exposed to external electric fields or temperature gradients. Overall, this research elucidates the intricate relationship between FR, magnetic order, and external perturbations, revealing the untapped potential and functionalities of magnetic FR materials.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143730605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spiral folding of a flexible chain of chiral active particles. 手性活性粒子柔性链的螺旋折叠。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-04-07 DOI: 10.1088/1361-648X/adc5c1

Shalabh K Anand

引用次数: 0

Pressure dependence of ultrafast carrier dynamics in excitonic insulator Ta₂NiSe₅. 激子绝缘体Ta2NiSe5中超快载流子动力学的压力依赖性。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-04-07 DOI: 10.1088/1361-648X/adc64b

Vikas Arora, D V S Muthu, Arijit Sinha, Luminita Harnagea, U V Waghmare, A K Sood

{"title":"Pressure dependence of ultrafast carrier dynamics in excitonic insulator Ta2NiSe5.","authors":"Vikas Arora, D V S Muthu, Arijit Sinha, Luminita Harnagea, U V Waghmare, A K Sood","doi":"10.1088/1361-648X/adc64b","DOIUrl":"10.1088/1361-648X/adc64b","url":null,"abstract":"An excitonic insulator (EI) phase is a consequence of collective many-body effects where an optical band gap is formed by the condensation of electron-hole pairs or excitons. We report pressure-dependent optical pump-optical probe spectroscopy of EI Ta2NiSe5up to 5 GPa. The differential reflectivity as a function of delay time between the pump and probe pulses shows two relaxation processes with their time constants and amplitudes revealing changes at PC1∼1 GPa (transition from EI phase to semiconductor) and PC2∼3 GPa (from semiconductor to semimetallic phase). The pressure dependence of the fast relaxation time and corresponding amplitude in the EI phase are captured by the Rothwarf-Taylor model, bringing out the decrease of the bandgap under pressure, with a pressure coefficient of 65 meV GPa-1, closely agreeing with our first principle calculations. The decrease of the slow relaxation time in the EI phase with pressure is due to enhanced electron-phonon coupling as confirmed by our calculations. The fluence dependence of the relaxation parameters at different pressures corroborates the semi-metallic nature above PC2. Our experiments combined with first principle calculations thus provide additional insights into different high-pressure phases of Ta2NiSe5.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143730530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Space-group approach to the Ginzburg-Landau phase winding in topological superconductors: application to Sr₂RuO₄. 拓扑超导体中Ginzburg-Landau相绕组的空间群方法：在Sr2RuO4中的应用。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-04-07 DOI: 10.1088/1361-648X/adc5d0

E A Teplyakov, V G Yarzhemsky

{"title":"Space-group approach to the Ginzburg-Landau phase winding in topological superconductors: application to Sr2RuO4.","authors":"E A Teplyakov, V G Yarzhemsky","doi":"10.1088/1361-648X/adc5d0","DOIUrl":"10.1088/1361-648X/adc5d0","url":null,"abstract":"SOP (superconducting order parameter) in topological superconductors is characterized by an IR (irreducible representation) of a point group and a phase winding. In the Ginzburg-Landau theory and in phenomenological symmetry approaches wavefunction of a Cooper pair is identified as a SOP, which is expressed in terms of Legendre polynomials ink-space. In the space-group approach a Cooper pair wavefunction is constructed on the basis of exact one-electron functions ink-space. In the present work a connection between an IR of individual pair and possible phase winding in a pair condensate is investigated group-theoretically. It has been shown that the nodal structure of SOP forD4hsymmetry is defined group-theoretically for one-dimensional IRs and for two-dimensional IRs in the basal plane. For two-dimensional IRs nodes in vertical planes are defined by the additional quantum numbers, i.e. the intermediate group and the labels of its IRs. Experimental nodal structure of SOP in Sr2RuO4with nodal basal plane and nodes and dips in vertical planes corresponds to IREg. It has been shown using group theory, that when the Ginzburg-Landau theory is extended on two-dimensional IRs of point groups each one of the basis functions has a half of phase winding±πmand total phase winding may be equal to zero or to2πm. Phase winding2πmcorresponds to the magnetic group4/mm'm'. Our results explain a possibility of half quantized flux in Sr2RuO4in the presence of external magnetic field and may be used for description of recently obtained phase winding0.3×2πin Ba1-xKxFe2As2.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143730579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hatsugai-Kohmoto models: exactly solvable playground for Mottness and non-Fermi liquid. Hatsugai-Kohmoto模型：Mottness和非费米液体的完全可解游乐场。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-04-07 DOI: 10.1088/1361-648X/adc64c

Miaomiao Zhao, Wei-Wei Yang, Yin Zhong

引用次数: 0

Oscillatory magnetic field-dependent critical temperatures of ultraclean Type-I superconductors. 超甲骨文 I 型超导体的振荡磁场临界温度。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-04-07 DOI: 10.1088/1361-648X/adc5d1

Aiying Zhao, Richard A Klemm, Qiang Gu

{"title":"Oscillatory magnetic field-dependent critical temperatures of ultraclean Type-I superconductors.","authors":"Aiying Zhao, Richard A Klemm, Qiang Gu","doi":"10.1088/1361-648X/adc5d1","DOIUrl":"10.1088/1361-648X/adc5d1","url":null,"abstract":"The influence of the Zeeman energy and the Landau levels (LLs) arising from an applied magnetic fieldBupon the critical temperatureTcis studied using a fully quantum mechanical method within the framework of the Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity that forms from an ultraclean metal. As in semiclassical treatments, we found that two electrons can form Cooper pairs with opposite spins and momenta in theBdirection while either in the same or in neighboring LLs. However, the fully quantum mechanical treatment of the LLs causesTc(B) for electrons paired on the same LL to oscillate about the critical temperature of the BCS theory, similar to that of the de Haas-van Alphen effect. The Zeeman energy causesTc(B) to decrease in an oscillatory fashion with increasingBfor electrons paired either on the same or on neighboring LLs. For the Zeemang > 1, pairing on neighboring LLs results in the highestTc(B). Forg < 1, pairing on the same LLs gives the highestTc(B). In addition,Tc(B) for electrons paired on neighboring LLs exhibits an apparent symmetry aroundg = 2, as the oscillatory critical temperature behaviors are nearly identical forg=2±δ.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143730529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0