arXiv - PHYS - Mesoscale and Nanoscale Physics最新文献_第2页

Probing band topology in ABAB and ABBA stacked twisted double bilayer graphene 探测 ABAB 和 ABBA 叠层扭曲双双层石墨烯的带拓扑结构

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-17 DOI: arxiv-2409.11023

Jundong Zhu, Le Liu, Yalong Yuan, Jinwei Dong, Yanbang Chu, Luojun Du, Kenji Watanabe, Takashi Taniguchi, Jianpeng Liu, Quansheng Wu, Dongxia Shi, Wei Yang, Guangyu Zhang

{"title":"Probing band topology in ABAB and ABBA stacked twisted double bilayer graphene","authors":"Jundong Zhu, Le Liu, Yalong Yuan, Jinwei Dong, Yanbang Chu, Luojun Du, Kenji Watanabe, Takashi Taniguchi, Jianpeng Liu, Quansheng Wu, Dongxia Shi, Wei Yang, Guangyu Zhang","doi":"arxiv-2409.11023","DOIUrl":"https://doi.org/arxiv-2409.11023","url":null,"abstract":"Twisted graphene moire superlattice has been demonstrated as an exotic\u0000platform for investigating correlated states and nontrivial topology. Among the\u0000moire family, twisted double bilayer graphene (TDBG) is a tunable flat band\u0000system expected to show stacking-dependent topological properties. However,\u0000electron correlations and the band topology are usually intertwined in the flat\u0000band limit, rendering the unique topological property due to stacking still\u0000elusive. Focusing on a large-angle TDBG with weak electron correlations, here\u0000we probe the Landau level (LL) spectra in two differently stacked TDBG, i.e.\u0000ABBA- and ABAB-TDBG, to unveil their distinct topological properties. For\u0000ABBA-TDBG, we observe non-trivial topology at zero electric displacement filed,\u0000evident from both the emergence of Chern bands from half fillings and the\u0000closure of gap at CNP above a critical magnetic field. For ABAB-TDBG, by\u0000contrast, we find that the moire band is topologically trivial, supported by\u0000the absence of LLs from half fillings and the persistence of the gap at CNP\u0000above the critical magnetic fields. In addition, we also observe an evolution\u0000of the trivial-to-nontrivial topological transition at finite D fields,\u0000confirmed by the emerged Landau fans originating from quarter filling v = 1.\u0000Our result demonstrates, for the first time, the unique stacking-dependent\u0000topology in TDBG, offering a promising avenue for future investigations on\u0000topological states in correlated systems.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142253552","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

Coherent Dipolar Coupling between Magnetoelastic Waves and Nitrogen Vacancy Centers 磁弹性波与氮空位中心之间的相干双极耦合

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-17 DOI: arxiv-2409.10862

Adi Jung, Samuel Margueron, Ausrine Bartasyte, Sayeef Salahuddin

引用次数: 0

Perturbation theory for dispersion relations of spacetime-periodic materials 时空周期材料频散关系的扰动理论

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-17 DOI: arxiv-2409.11514

Erik Orvehed Hiltunen

引用次数: 0

Intrinsic nonlinear Nernst and Seebeck effect 固有的非线性 Nernst 和 Seebeck 效应

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-17 DOI: arxiv-2409.11108

Harsh Varshney, Amit Agarwal

引用次数: 0

Chiral propagation of plasmons due to competing anisotropies in a twisted photonic heterostructure 扭曲光子异质结构中相互竞争的各向异性导致的质子手性传播

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-17 DOI: arxiv-2409.11066

Ze-Hua Tao, Icaro R. Lavor, Hai-Ming Dong, Andrey Chaves, David Neilson, Milorad V. Milosevic

引用次数: 0

Interplay of Electron Trapping by Defect Midgap State and Quantum Confinement to Optimize Hot Carrier Effect in a Nanowire Structure 缺陷中隙态电子捕获与量子禁锢的相互作用优化了纳米线结构中的热载流子效应

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-17 DOI: arxiv-2409.11544

Imam Makhfudz, Hamidreza Esmaielpour, Yaser Hajati, Gregor Koblmüller, Nicolas Cavassilas

{"title":"Interplay of Electron Trapping by Defect Midgap State and Quantum Confinement to Optimize Hot Carrier Effect in a Nanowire Structure","authors":"Imam Makhfudz, Hamidreza Esmaielpour, Yaser Hajati, Gregor Koblmüller, Nicolas Cavassilas","doi":"arxiv-2409.11544","DOIUrl":"https://doi.org/arxiv-2409.11544","url":null,"abstract":"Hot carrier effect, a phenomenon where charge carriers generated by photon\u0000absorption remain energetic by not losing much energy, has been one of the\u0000leading strategies in increasing solar cell efficiency. Nanostructuring offers\u0000an effective approach to enhance hot carrier effect via the spatial\u0000confinement, as occurring in a nanowire structure. The recent experimental\u0000study by Esmaielpour et al. [ACS Applied Nano Materials 7, 2817 (2024)] reveals\u0000a fascinating non-monotonic dependence of the hot carrier effect in nanowire\u0000array on the diameter of the nanowire, contrary to what might be expected from\u0000quantum confinement alone. We show that this non-monotonic behavior can be\u0000explained by a simple model for electron energy loss that involves two\u0000principal mechanisms. First, electron-phonon scattering, that increases with\u0000nanowire diameter, leading to hot carrier effect that decreases with increasing\u0000diameter. Second, electron capture by a defect level within band gap, that is,\u0000a midgap state, that decreases with nanowire diameter, leading to hot carrier\u0000effect that increases with increasing diameter. The two mechanisms balance at a\u0000certain diameter corresponding to optimal hot carrier effect. Our result offers\u0000a guideline to optimize hot carrier effect in nanowire solar cells and\u0000ultimately their efficiency by adjusting the dimensions and micro-structural\u0000properties of nanowires.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"192 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142253497","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

The tuning of para- and diamagnetic cavity photon excitations in a square array of quantum dots in a magnetic field 方形量子点阵列在磁场中的顺磁腔和二磁腔光子激发调谐

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-16 DOI: arxiv-2409.09936

Vidar Gudmundsson, Vram Mughnetsyan, Hsi-Sheng Goan, Jeng-Da Chai, Nzar Rauf Abdullah, Chi-Shung Tang, Valeriu Moldoveanu, Andrei Manolescu

{"title":"The tuning of para- and diamagnetic cavity photon excitations in a square array of quantum dots in a magnetic field","authors":"Vidar Gudmundsson, Vram Mughnetsyan, Hsi-Sheng Goan, Jeng-Da Chai, Nzar Rauf Abdullah, Chi-Shung Tang, Valeriu Moldoveanu, Andrei Manolescu","doi":"arxiv-2409.09936","DOIUrl":"https://doi.org/arxiv-2409.09936","url":null,"abstract":"We employ a ``real-time'' excitation scheme to calculate the excitation\u0000spectra of a two-dimensional electron system in a square array of quantum dots\u0000placed in a circular cylindrical far-infrared photon cavity subjected to a\u0000perpendicular homogeneous external magnetic field. The Coulomb interaction of\u0000the electrons is handled via spin density functional theory and the para- and\u0000the diamagnetic parts of the electron-photon coupling are updated according to\u0000a configuration interaction method in each iteration of the density functional\u0000calculation. The results show that an excitation scheme built on using the\u0000symmetry of the lateral square superlattice of the dots and the cylindrical\u0000cavity produces both para- and diamagnetic resonance peaks with oscillator\u0000strengths that can be steered by the excitation pulse parameters. The\u0000excitation method breaks the conditions for the generalized Kohn theorem and\u0000allows for insight into the subband structure of the electron system and can be\u0000used both in and outside the linear response regime.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142253555","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

Quantum light generation with ultra-high spatial resolution in 2D semiconductors via ultra-low energy electron irradiation 通过超低能量电子辐照在二维半导体中产生具有超高空间分辨率的量子光

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-16 DOI: arxiv-2409.10321

Ajit Kumar Dash, Sharad Kumar Yadav, Sebastien Roux, Manavendra Pratap Singh, Kenji Watanabe, Takashi Taniguchi, Akshay Naik, Cedric Robert, Xavier Marie, Akshay Singh

{"title":"Quantum light generation with ultra-high spatial resolution in 2D semiconductors via ultra-low energy electron irradiation","authors":"Ajit Kumar Dash, Sharad Kumar Yadav, Sebastien Roux, Manavendra Pratap Singh, Kenji Watanabe, Takashi Taniguchi, Akshay Naik, Cedric Robert, Xavier Marie, Akshay Singh","doi":"arxiv-2409.10321","DOIUrl":"https://doi.org/arxiv-2409.10321","url":null,"abstract":"Single photon emitters (SPEs) are building blocks of quantum technologies.\u0000Defect engineering of 2D materials is ideal to fabricate SPEs, wherein\u0000spatially deterministic and quality-preserving fabrication methods are critical\u0000for integration into quantum devices and cavities. Existing methods use\u0000combination of strain and electron irradiation, or ion irradiation, which make\u0000fabrication complex, and limited by surrounding lattice damage. Here, we\u0000utilise only ultra-low energy electron beam irradiation (5 keV) to create\u0000dilute defect density in hBN-encapsulated monolayer MoS2, with ultra-high\u0000spatial resolution (< 50 nm, extendable to 10 nm). Cryogenic photoluminescence\u0000spectra exhibit sharp defect peaks, following power-law for finite density of\u0000single defects, and characteristic Zeeman splitting for MoS2 defect complexes.\u0000The sharp peaks have low spectral jitter (< 200 {mu}eV), and are tuneable with\u0000gate-voltage and electron beam energy. Use of low-momentum electron\u0000irradiation, ease of processing, and high spatial resolution, will disrupt\u0000deterministic creation of high-quality SPEs.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"206 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142253559","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

Engineering topological states and quantum-inspired information processing using classical circuits 工程拓扑状态和使用经典电路的量子启发式信息处理

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-16 DOI: arxiv-2409.09919

Tian Chen, Weixuan Zhang, Deyuan Zou, Yifan Sun, Xiangdong Zhang

引用次数: 0

Temporal and spatial attenuation of inertial spin waves driven by spin-transfer torques 自旋传递扭矩驱动的惯性自旋波的时空衰减

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-16 DOI: arxiv-2409.10457

Peng-Bin He, Mikhail Cherkasskii

引用次数: 0