290 citations · 1.2k across the 28 of their papers we have counts for
12 papers · 1 filter
Robust Super-Moiré in Large Angle Single-Twist Bilayers
Yanxing Li, Chuqiao Shi, Fan Zhang +19
Forming long wavelength moiré superlattices (MSL) at small-angle twist van der Waals (vdW) bilayers has been a key approach to creating moiré flat bands. The small-angle twist, how…
Real-Space Imaging of the Band Topology of Transition Metal Dichalcogenides
Madisen Holbrook, Julian Ingham, Daniel Kaplan +11
The topological properties of Bloch bands are intimately tied to the structure of their electronic wavefunctions within the unit cell of a crystal. Here, we show that scanning tunn…
Efficient light upconversion via resonant exciton-exciton annihilation of dark excitons in few-layer transition metal dichalcogenides
Yi-Hsun Chen, Ping-Yuan Lo, Kyle W. Boschen +15
In this work, we report a pronounced light upconversion in few-layer transition metal dichalcogenides. Our joint theory-experiment study attributes the upconversion photoluminescen…
Automated Grain Boundary Detection for Bright-Field Transmission Electron Microscopy Images via U-Net
Matthew J. Patrick, James K. Eckstein, Javier R. Lopez +6
Quantification of microstructures is crucial for understanding processing-structure and structure-property relationships in polycrystalline materials. Delineating grain boundaries…
Detecting Atomic Scale Surface Defects in STM of TMDs with Ensemble Deep Learning
Darian Smalley, Stephanie D. Lough, Luke Holtzman +6
Atomic-scale defect detection is shown in scanning tunneling microscopy images of single crystal WSe2 using an ensemble of U-Net-like convolutional neural networks. Standard deep l…
Two-step flux synthesis of ultrapure transition metal dichalcogenides
Song Liu, Yang Liu, Luke Nemetz Holtzman +10
Here, we describe synthesis of TMD crystals using a two-step flux growth method that eliminates a major potential source of contamination. Detailed characterization of TMDs grown b…
Relative Grain Boundary Energies from Triple Junction Geometry: Limitations to Assuming the Herring Condition in Nanocrystalline Thin Films
Matthew J. Patrick, Gregory S. Rohrer, Ooraphan Chirayutthanasak +5
Grain boundary character distributions (GBCD) are routinely measured from bulk microcrystalline samples by electron backscatter diffraction (EBSD) and serial sectioning can be used…
Grain Growth and the Effect of Different Time Scales
Katayun Barmak, Anastasia Dunca, Yekaterina Epshteyn +2
Many technologically useful materials are polycrystals composed of a myriad of small monocrystalline grains separated by grain boundaries. Dynamics of grain boundaries play a cruci…
WSe2/WS2 moiré superlattices: a new Hubbard model simulator
Yanhao Tang, Lizhong Li, Tingxin Li +8
The Hubbard model, first formulated by physicist John Hubbard in the 1960s, is a simple theoretical model of interacting quantum particles in a lattice. The model is thought to cap…
Statistics of grain growth: experiment versus the Phase-Field-Crystal and Mullins models
Gabriel Martine La Boissoniere, Rustum Choksi, Katayun Barmak +1
We present a detailed comparison of multiple statistical grain metrics for previously reported experimental thin film samples of aluminum with 2D simulations obtained from the Phas…
Hundredfold Enhancement of Light Emission via Defect Control in Monolayer Transition-Metal Dichalcogenides
D. Edelberg, D. Rhodes, A. Kerelsky +18
Two dimensional (2D) transition-metal dichalcogenide (TMD) based semiconductors have generated intense recent interest due to their novel optical and electronic properties, and pot…
Grain growth beyond the Mullins model, capturing the complex physics behind universal grain size distributions
Rainer Backofen, Katayun Barmak, Ken Elder +1
Grain growth experiments on thin metallic films have shown the geometric and topological characteristics of the grain structure to be universal and independent of many experimental…