Publications by authors named "Anne Tan"

The objective of this case presentation is to identify factors that hinder home deaths after patients have been compassionately discharged from the hospital. It aims to shed light on modifiable factors that could facilitate a home death. Compassionate discharges differ from routine discharges as they are done to support the wishes of terminally ill patients to pass on at home.

View Article and Find Full Text PDF

The functionality of atomic quantum emitters is intrinsically linked to their host lattice coordination. Structural distortions that spontaneously break the lattice symmetry strongly impact their optical emission properties and spin-photon interface. Here we report on the direct imaging of charge state-dependent symmetry breaking of two prototypical atomic quantum emitters in mono- and bilayer MoS by scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM).

View Article and Find Full Text PDF

Ultrathin MoS has shown remarkable characteristics at the atomic scale with an immutable disorder to weak external stimuli. Ion beam modification unlocks the potential to selectively tune the size, concentration, and morphology of defects produced at the site of impact in 2D materials. Combining experiments, first-principles calculations, atomistic simulations, and transfer learning, it is shown that irradiation-induced defects can induce a rotation-dependent moiré pattern in vertically stacked homobilayers of MoS by deforming the atomically thin material and exciting surface acoustic waves (SAWs).

View Article and Find Full Text PDF
Article Synopsis
  • - The study explores how defects in two-dimensional materials, specifically single-layer WS, can enhance properties like photoluminescence (PL) and enable applications like single-photon emission by using nitrogen plasma exposure.
  • - Researchers discovered a unique low-energy PL peak at 1.59 eV, influenced by the nitrogen substitution for sulfur, which varies with sulfur deficiency levels, peaking at a 2.0% deficiency and disappearing at higher levels.
  • - First-principles calculations support the findings, indicating the potential of the nitrogen defects in WS as isolated artificial atoms for single-photon emitters, while also providing a method to track nitrogen doping concentration through PL intensity.
View Article and Find Full Text PDF

Reliable, controlled doping of 2D transition metal dichalcogenides will enable the realization of next-generation electronic, logic-memory, and magnetic devices based on these materials. However, to date, accurate control over dopant concentration and scalability of the process remains a challenge. Here, a systematic study of scalable in situ doping of fully coalesced 2D WSe films with Re atoms via metal-organic chemical vapor deposition is reported.

View Article and Find Full Text PDF

Modeling isolated dislocations is challenging due to their long-ranged strain fields. Flexible boundary condition methods capture the correct long-range strain field of a defect by coupling the defect core to an infinite harmonic bulk through the lattice Green function (LGF). To improve the accuracy and efficiency of flexible boundary condition methods, we develop a numerical method to compute the LGF specifically for a dislocation geometry; in contrast to previous methods, where the LGF was computed for the perfect bulk as an approximation for the dislocation.

View Article and Find Full Text PDF

A PHP Error was encountered

Severity: Warning

Message: fopen(/var/lib/php/sessions/ci_sessionrhkgmddkoodp8b4avoouujams8q3drh7): Failed to open stream: No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 177

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)

Filename: Session/Session.php

Line Number: 137

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once