arXiv - PHYS - Other Condensed Matter最新文献

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-09-16 DOI: arxiv-2409.10290

Atreya Majumdar, Karin Everschor-Sitte

引用次数: 0

Corotation of two quantized vortices coupled with collective modes in self-gravitating Bose-Einstein condensates 自引力玻色-爱因斯坦凝聚体中与集体模式耦合的两个量子化涡旋的相关性

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-09-12 DOI: arxiv-2409.07860

Kenta Asakawa, Makoto Tsubota

{"title":"Corotation of two quantized vortices coupled with collective modes in self-gravitating Bose-Einstein condensates","authors":"Kenta Asakawa, Makoto Tsubota","doi":"arxiv-2409.07860","DOIUrl":"https://doi.org/arxiv-2409.07860","url":null,"abstract":"We numerically examine the corotation of two parallel quantized vortices in a\u0000self-gravitating Bose-Einstein condensate (BEC) employing the\u0000Gross-Pitaevskii-Poisson equations. The long-range gravitationally attractive\u0000interaction allows the BEC to self-confine without the need for external\u0000potentials, while the density-dependence of the gravitational potential induces\u0000intriguing behaviors in the quantized vortices. The aim of this study is to\u0000provide a clue for understanding the corotation of two quantized vortices under\u0000the influence of gravitational interactions. The corotation of two quantized\u0000vortices is coupled with collective modes of the BEC, which markedly differs\u0000from the behavior observed in typical BECs confined by an external potential.\u0000The rotational period increases linearly with the initial position from the\u0000center of the BEC. This deviation from the quadratic increase observed in a\u0000uniform BEC suggests that the gravitational interaction exerts a drag effect on\u0000the rotating quantized vortices. The two closely positioned quantized vortices\u0000rotate along elliptical orbits with radial fluctuations. However, when the\u0000quantized vortices are initially positioned beyond a critical radius comparable\u0000to their core sizes, their trajectory transitions into an outward spiral,\u0000implying the onset of effective dissipation. Our findings demonstrate that the\u0000radial fluctuations of the quantized vortex resonate with the quadrupole mode\u0000of the BEC, giving rise to a dissipation mechanism.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181820","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

Tuned ionic mobility by Ultrafast-laser pulses in Black Silicon 利用超快激光脉冲调节黑硅中的离子迁移率

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-09-11 DOI: arxiv-2409.07659

Christelle Inès K. Mebou, Martin E. Garcia, Tobias Zier

{"title":"Tuned ionic mobility by Ultrafast-laser pulses in Black Silicon","authors":"Christelle Inès K. Mebou, Martin E. Garcia, Tobias Zier","doi":"arxiv-2409.07659","DOIUrl":"https://doi.org/arxiv-2409.07659","url":null,"abstract":"Highly non-equilibrium conditions in femtosecond-laser excited solids cause a\u0000variety of ultrafast phenomena that are not accessible by thermal conditions,\u0000like sub-picosecond solid-to-liquid or solid-to-solid phase transitions. In\u0000recent years the microscopic pathways of various laser-induced crystal\u0000rearrangements could be identified and led to novel applications and/or\u0000improvements in optoelectronics, photonics, and nanotechnology. However, it\u0000remains unclear what effect a femtosecond-laser excitation has on ionic\u0000impurities within an altered crystal environment, in particular on the atomic\u0000mobility. Here, we performed ab-initio molecular dynamics (AIMD) simulations on\u0000laser-excited black silicon, a promising material for high-efficient solar\u0000cells, using the Code for Highly excIted Valence Electron Systems (CHIVES). By\u0000computing time-dependent Bragg peak intensities for doping densities of 0.16%\u0000and 2.31% we could identify the overall weakening of the crystal environment\u0000with increasing impurity density. The analysis of Si-S bond angles and lengths\u0000after different excitation densities, as well as computing interatomic forces\u0000allowed to identify a change in ion mobility with increasing impurity density\u0000and excitation strength. Our results indicate the importance of impurity\u0000concentrations for ionic mobility in laser-excited black silicon and could give\u0000significant insight for semiconductor device optimization and materials science\u0000advancement.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181821","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

Switchable Crystalline Islands in Super Lubricant Arrays 超级润滑剂阵列中的可切换晶岛

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-09-11 DOI: arxiv-2409.07225

Youngki Yeo, Yoav Sharaby, Nirmal Roy, Noam Raab, Watanabe Kenji, Takashi Taniguchi, Moshe Ben Shalom

{"title":"Switchable Crystalline Islands in Super Lubricant Arrays","authors":"Youngki Yeo, Yoav Sharaby, Nirmal Roy, Noam Raab, Watanabe Kenji, Takashi Taniguchi, Moshe Ben Shalom","doi":"arxiv-2409.07225","DOIUrl":"https://doi.org/arxiv-2409.07225","url":null,"abstract":"Expanding the performance of field effect devices is a key challenge of the\u0000ever-growing chip industry at the core of current technologies. A highly\u0000desired nonvolatile response in tiny multiferroic transistors is expected by\u0000electric field control of atomic movements rather than the typical electronic\u0000redistribution. Recently, such field effect control of structural transitions\u0000was established in commensurate stacking configurations of honeycomb van der\u0000Waals (vdW) polytypes by sliding narrow boundary dislocations between\u0000oppositely polarized domains. The interfacial ferroelectric response, however,\u0000relied on preexisting boundary strips between relatively large micron-scale\u0000domains, severely limiting practical implementations. Here, we report the\u0000robust switching of single-domain polytypes in nm-scale islands embedded in\u0000super lubricant vdW arrays. We etch cavities into a thin layered spacer and\u0000then encapsulate it with parallel functional flakes. The incommensurate flakes\u0000above and under the spacer sag and touch at each cavity to form uniform\u0000crystalline islands free from interlayer deformations. By imaging the\u0000polytypes' ferroelectric response, we observe reversible nucleation and\u0000annihilation of boundary strips and geometry-adaptable hysteresis loops. Using\u0000mechanical stress, we accurately position the boundary strip, modify the\u0000interlayer twist angle, and nucleate intermediate polar domain patterns. By\u0000precisely designing the size, shape, symmetry, and distribution of the islands\u0000in these Super Lubricant Arrays of Polytype (SLAP), we envision numerous device\u0000functionalities and SlideTronics applications. These range from ultra-sensitive\u0000detectors of atomic-scale shifts to nonvolatile multi-ferroic tunneling\u0000transistors with tunable coercive switching fields, and even\u0000elastically-coupled memory cells for neuromorphic architectures.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181823","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

CAVERNAUTE: a design and manufacturing pipeline of a rigid but foldable indoor airship aerial system for cave exploration CAVERNAUTE：用于洞穴探索的刚性但可折叠的室内飞艇航空系统的设计和制造流水线

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-09-11 DOI: arxiv-2409.07591

Catar Louis, Tabiai Ilyass, St-Onge David

{"title":"CAVERNAUTE: a design and manufacturing pipeline of a rigid but foldable indoor airship aerial system for cave exploration","authors":"Catar Louis, Tabiai Ilyass, St-Onge David","doi":"arxiv-2409.07591","DOIUrl":"https://doi.org/arxiv-2409.07591","url":null,"abstract":"Airships, best recognized for their unique quality of payload/energy ratio,\u0000present a fascinating challenge for the field of engineering. Their\u0000construction and operation require a delicate balance of materials and rules,\u0000making them a compelling object of study. They embody a distinct intersection\u0000of physics, design, and innovation, offering a wide array of possibilities for\u0000future transportation and exploration. Thanks to their long-flight endurance,\u0000they are suited for long-term missions. To operate in complex environments such\u0000as indoor cluttered spaces, their membrane and mechatronics need to be\u0000protected from impacts. This paper presents a new indoor airship design\u0000inspired by origami and the Kresling pattern. The airship structure combines a\u0000carbon fiber exoskeleton and UV resin micro-lattices for shock absorption. Our\u0000design strengthens the robot while granting the ability to access narrow spaces\u0000by folding the structure - up to a volume expansion ratio of 19.8. To optimize\u0000the numerous parameters of the airship, we present a pipeline for design,\u0000manufacture, and assembly. It takes into account manufacturing constraints,\u0000dimensions of the target deployment area, and aerostatics, allowing for easy\u0000and quick testing of new configurations. We also present unique features made\u0000possible by combining origami with airship design, which reduces the chances of\u0000mission-compromising failures. We demonstrate the potential of the design with\u0000a complete simulation including an effective control strategy leveraging\u0000lightweight mechatronics to optimize flight autonomy in exploration missions of\u0000unstructured environments.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181822","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

Proposal to Observe Transverse Sound in Normal Liquid $^3$He in Aerogel 关于在气凝胶中观测常态液体 $^3$He 中横向声的建议

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-09-10 DOI: arxiv-2409.06363

Priya Sharma

引用次数: 0

Quasicrystalline 30$^{circ}$ twisted bilayer graphene: Fractal patterns and electronic localization properties 准结晶 30$^{/circ}$ 扭曲双层石墨烯：分形图案和电子定位特性

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-09-08 DOI: arxiv-2409.05126

Kevin J. U. Vidarte, Caio Lewenkopf

引用次数: 0

Engineering unique localization transition with coupled Hatano-Nelson chains 利用哈塔诺-尼尔森耦合链设计独特的定位转换

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-09-06 DOI: arxiv-2409.04417

Ritaban Samanta, Aditi Chakrabarty, Sanjoy Datta

{"title":"Engineering unique localization transition with coupled Hatano-Nelson chains","authors":"Ritaban Samanta, Aditi Chakrabarty, Sanjoy Datta","doi":"arxiv-2409.04417","DOIUrl":"https://doi.org/arxiv-2409.04417","url":null,"abstract":"The Hatano-Nelson (HN) Hamiltonian has played a pivotal role in catalyzing\u0000research interest in non-Hermitian systems, primarily because it showcases\u0000unique physical phenomena that arise solely due to non-Hermiticity. The\u0000non-Hermiticity in the HN Hamiltonian, driven by asymmetric hopping amplitudes,\u0000induces a delocalization-localization (DL) transition in a one-dimensional (1D)\u0000lattice with random disorder, sharply contrasting with its Hermitian\u0000counterpart. A similar DL transition occurs in a 1D quasiperiodic HN (QHN)\u0000lattice, where a critical quasiperiodic potential strength separates metallic\u0000and insulating states, akin to the Hermitian case. In these systems, all states\u0000below the critical potential are delocalized, while those above are localized.\u0000In this study, we reveal that coupling two 1D QHN lattices can significantly\u0000alter the nature of the DL transition. We identify two critical points, $V_{c1}\u0000< V_{c2}$, when the nearest neighbors of the two 1D QHN lattices are\u0000cross-coupled with strong hopping amplitudes under periodic boundary conditions\u0000(PBC). Generally, all states are completely delocalized below $ V_{c1}$ and\u0000completely localized above $V_{c2}$, while two mobility edges symmetrically\u0000emerge about $rm{Re[E]} = 0$ between $V_{c1}$ and $V_{c2}$. Notably, under\u0000specific asymmetric cross-hopping amplitudes, $V_{c1}$ approaches zero,\u0000resulting in localized states even for infinitesimally weak potential.\u0000Remarkably, we also find that the mobility edges precisely divide the\u0000delocalized and localized states in equal proportions. Furthermore, we observe\u0000that the conventional one-to-one correspondence between electronic states under\u0000PBC and open boundary conditions (OBC) in 1D HN lattices breaks","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181830","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

Bulk and surface electron scattering in disordered Bi$_{2}$Te$_{3}$ probed by quasiparticle interference 通过准粒子干涉探测无序 Bi$_{2}$Te$_{3}$ 中的块体和表面电子散射

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-09-06 DOI: arxiv-2409.04294

Vladislav Nagorkin, Sebastian Schimmel, Paul Gebauer, Anna Isaeva, Danny Baumann, Andreas Koitzsch, Bernd Büchner, Christian Hess

引用次数: 0

Electromagnetic field assisted exciton diffusion in moiré superlattices 摩尔纹超晶格中的电磁场辅助激子扩散

arXiv - PHYS - Other Condensed Matter Pub Date : 2024-09-06 DOI: arxiv-2409.04284

A. M. Shentsev, M. M. Glazov

{"title":"Electromagnetic field assisted exciton diffusion in moiré superlattices","authors":"A. M. Shentsev, M. M. Glazov","doi":"arxiv-2409.04284","DOIUrl":"https://doi.org/arxiv-2409.04284","url":null,"abstract":"We study exciton energy spectrum and their propagation in moir'e\u0000superlattices formed in transition metal dichalcogenide heterobilayers. In such\u0000structures, as a result of weak interlayer interaction, an effective, moir'e,\u0000potential acting on excitons arises. Usually, excitons are considered to be\u0000localized in such potential. Here we demonstrate that the coupling of optically\u0000active excitons with induced electromagnetic field produces linear in the\u0000wavevector energy dispersion even if the quantum mechanical tunneling between\u0000the localization sites is suppressed. The effect can be described as a result\u0000of the processes of virtual generation-recombination of excitons at the\u0000localization sites that results in the $ r^{-3}$ dependence of the transfer\u0000matrix element on the intersite distance $r$. Based on the calculated energy\u0000spectrum we study exciton propagation in moir'e superlattices with allowance\u0000for the light-exciton interaction. We consider semiclassical diffusion of\u0000excitons and take into account exciton-phonon and exciton-static defect\u0000scattering. For these mechanisms the diffusion coefficient decreases with\u0000increase of the temperature. We also analyze the hopping propagation regime and\u0000demonstrate that the temperature dependence of the exciton diffusion\u0000coefficient is described by the power-law rather than by an exponential\u0000function of the temperature.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181831","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