Runnan Zhang

ORCID: 0000-0001-6115-2479
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Research Areas
  • Topological Materials and Phenomena
  • Digital Holography and Microscopy
  • 2D Materials and Applications
  • Magnetic properties of thin films
  • Force Microscopy Techniques and Applications
  • Diamond and Carbon-based Materials Research
  • Advanced X-ray Imaging Techniques
  • Advanced Materials Characterization Techniques
  • Graphene research and applications
  • Crystallization and Solubility Studies
  • Adaptive optics and wavefront sensing
  • Microfluidic and Bio-sensing Technologies
  • X-ray Diffraction in Crystallography
  • Optical Coherence Tomography Applications
  • Image Processing Techniques and Applications
  • Multiferroics and related materials
  • Advanced Thermoelectric Materials and Devices
  • Optical measurement and interference techniques
  • Photoacoustic and Ultrasonic Imaging

The University of Tokyo
2023-2025

Nanjing University of Science and Technology
2021-2024

Southern University of Science and Technology
2019-2022

The heterostructures of the ferromagnet (Cr2Te3) and topological insulator (Bi2Te3) have been grown by molecular beam epitaxy. Hall effect as evidence existence magnetic skyrmions has observed in samples which Cr2Te3 was on top Bi2Te3. Detailed structural characterizations unambiguously revealed presence intercalated Bi bilayer nanosheets right at interface those samples. atomistic spin-dynamics simulations further confirmed such systems. that host may provide an important building block for...

10.1021/acs.nanolett.9b02191 article EN Nano Letters 2019-08-23

Achieving atomic-level characterization of the diamond (001) surface has been a persistent goal over recent decades. This pursuit aims to understand smooth growth diamonds and investigate defects adsorbates relevant applications. However, inherently low conductivity short C–C bonds present significant challenges for atomic resolution imaging. Here, we successfully addressed these using near-contact force microscopy with reactive Si tips, achieving resolution, even at room temperature....

10.1021/acs.nanolett.4c05395 article EN Nano Letters 2025-01-08

The potential of diamond films for future semiconductor applications is partly limited by current growth techniques. This limitation can be addressed achieving an atomic-level understanding the processes. Using atomic force microscopy with resolution, we examined surfaces and observed specific structures, where odd numbers dimers form ribbonlike configurations. Formed in nonequilibrium environment plasma, these structures were evaluated as most stable configurations through...

10.1103/physrevresearch.7.023036 article EN cc-by Physical Review Research 2025-04-10

Topological Hall effect is an abnormal response arising from the scalar spin chirality of chiral magnetic textures. Up to now, such only observed in certain special materials, but rarely traditional ferromagnets. In this work, we have implemented molecular beam epitaxy technique successfully embed black-phosphorus-like bismuth nanosheets with strong spin-orbit coupling into bulk chromium telluride Cr2Te3, as evidenced by atomically resolved energy dispersive X-ray spectroscopy mapping....

10.1021/acsami.0c04447 article EN ACS Applied Materials & Interfaces 2020-04-27

Abstract Lens-free on-chip microscopy (LFOCM) has been widely utilized in digital pathology, drug screening, point-of-care testing (POCT), and quantitative phase imaging (QPI) due to its high throughput capability compactness. Initially, coherent laser sources were used LFOCM generate interference fringes reconstruct the intensity information of an object. The use partially light-emitting diodes (LEDs) offers a more portable cost-effective alternative conventional illumination sources....

10.1038/s44310-024-00015-8 article EN cc-by Deleted Journal 2024-06-28

We implement the molecular beam epitaxy method to embed black-phosphorus-like bismuth nanosheets into bulk ferromagnet Cr$_2$Te$_3$. As a typical surfactant, lowers surface tensions and mediates layer-by-layer growth of Meanwhile, atoms precipitate with lateral size several tens nanometers. In Cr$_2$Te$_3$ embedded Bi-nanosheets, we observe simultaneously large topological Hall effect together magnetic susceptibility plateau magnetoresistivity anomaly. control experiment, none these signals...

10.48550/arxiv.1903.06486 preprint EN other-oa arXiv (Cornell University) 2019-01-01

To achieve atomic-level characterization of the diamond (001) surface, persistent efforts have been made over past few decades. The motivation behind pursuit extends beyond investigating surface defects and adsorbates; it also involves unraveling mystery smooth growth diamond. However, inherently low conductivity short C-C bonds render atomic resolution imaging exceptionally challenging. Here, we successfully overcame these challenges by employing non-contact force microscopy with reactive...

10.48550/arxiv.2403.17427 preprint EN arXiv (Cornell University) 2024-03-26

A delicate superlattice structure of Cr2Te3/Bi2/Bi2Te3 has been constructed based on the chemical reduction at interface. The growth was conducted by molecular beam epitaxy, and structural characterizations have provided solid evidence designed structure. interfaces between Cr2Te3, Bi2 Bi2Te3 are sharp. ferromagnetism introduced in this system as revealed negative magnetoresistance curve anomalous Hall effect.

10.1063/5.0081367 article EN Applied Physics Letters 2022-02-28

Abstract Computational microscopy, as a subfield of computational imaging, combines optical manipulation and image algorithmic reconstruction to recover multi-dimensional microscopic images or information micro-objects. In recent years, the revolution in light-emitting diodes (LEDs), low-cost consumer sensors, modern digital computers, smartphones provide fertile opportunities for rapid development microscopy. Consequently, diverse forms microscopy have been invented, including holographic...

10.21203/rs.3.rs-599112/v1 preprint EN cc-by Research Square (Research Square) 2021-06-12

We report a new coherence retrieval method based on transport of intensity stack. capture images at different focal planes, corresponding to phase-space shearing projection, into four-dimensional (4D) phase space create both high spatial and frequency resolution space. represent the optical field an arbitrary coherent mode with help typical function in space, i.e., Wigner distribution function. Previous studies mainly focus measurement by means interferometry. In addition, despite sacrifice...

10.1109/ogc55558.2022.10050985 article EN 2022-12-06
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