Johanna Zultak

ORCID: 0000-0003-0901-038X
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About
Contact & Profiles
Research Areas
  • 2D Materials and Applications
  • Graphene research and applications
  • Solid-state spectroscopy and crystallography
  • Quantum and electron transport phenomena
  • Neural Networks and Reservoir Computing
  • MXene and MAX Phase Materials
  • Quantum Computing Algorithms and Architecture
  • Perovskite Materials and Applications
  • Quantum Information and Cryptography
  • Advanced Semiconductor Detectors and Materials
  • Quantum Dots Synthesis And Properties
  • Chalcogenide Semiconductor Thin Films
  • Microfluidic and Capillary Electrophoresis Applications
  • Topological Materials and Phenomena
  • Thermal properties of materials
  • Microfluidic and Bio-sensing Technologies
  • Advancements in Semiconductor Devices and Circuit Design
  • Quantum optics and atomic interactions
  • Electronic and Structural Properties of Oxides
  • Metamaterials and Metasurfaces Applications
  • Advanced Thermoelectric Materials and Devices
  • Advanced Thermodynamics and Statistical Mechanics
  • Spectroscopy and Quantum Chemical Studies
  • Nanopore and Nanochannel Transport Studies
  • Photoreceptor and optogenetics research

University of Manchester
2019-2024

University of Colorado Boulder
2024

Praevium Research (United States)
2023

Henry Royce Institute
2019-2020

Ørsted (Denmark)
2017

Technical University of Denmark
2017

Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine
2016

We report efficient nonradiative energy transfer (NRET) from core-shell, semiconducting quantum dots to adjacent two-dimensional sheets of graphene and MoS2 single- few-layer thickness. observe quenching the photoluminescence (PL) individual enhanced PL decay rates in time-resolved PL, corresponding 1-10 ns(-1). Our measurements reveal contrasting trends NRET rate dot van der Waals material as a function The increases significantly with increasing layer thickness graphene, but decreases...

10.1021/acs.nanolett.5b05012 article EN Nano Letters 2016-03-01

When two-dimensional atomic crystals are brought into close proximity to form a van der Waals heterostructure, neighbouring can start influencing each others electronic properties. Of particular interest is the situation when periodicity of two closely match and moir\'e pattern forms, which results in specific electron scattering, reconstruction excitonic spectra, crystal reconstruction, many other effects. Thus, formation patterns viable tool controlling properties 2D materials. At same...

10.1126/sciadv.aay8897 article EN cc-by-nc Science Advances 2019-12-06

Atomically thin films of III–VI post-transition metal chalcogenides (InSe and GaSe) form an interesting class two-dimensional semiconductors that feature a strong variation their band gap as function the number layers in crystal and, specifically for InSe, expected crossover from direct bulk to weakly indirect monolayers bilayers. Here, we apply angle-resolved photoemission spectroscopy with submicrometer spatial resolution (μARPES) visualize layer-dependent valence structure mechanically...

10.1021/acsnano.8b08726 article EN ACS Nano 2019-01-25

Control over the electronic spectrum at low energy is heart of functioning modern advanced electronics: high electron mobility transistors, semiconductor and Capasso terahertz lasers, many others. Most those devices rely on meticulous engineering size quantization electrons in quantum wells. This avenue, however, hasn't been explored case 2D materials. Here we transfer this concept onto van der Waals heterostructures which utilize few-layers films InSe as The precise control subbands their...

10.1038/s41467-019-13893-w article EN cc-by Nature Communications 2020-01-08

Most biosensing techniques require complex processing steps that generate prolonged workflows and introduce potential points of error. Here, we report an acoustic pipette to purify label biomarkers in 70 minutes. A key aspect this technology is the use functional negative contrast particles (fNACPs), which display biorecognition motifs for specific capture from whole blood. Because their large size compressibility, fNACPs robustly trap along pressure antinodes a standing wave separate blood...

10.1126/sciadv.ado9018 article EN cc-by-nc Science Advances 2024-10-16

Abstract In two-dimensional heterostructures, crystalline atomic layers with differing lattice parameters can stack directly one on another. The resultant close proximity of lattices periodicity lead to new phenomena. For umklapp processes, this opens the possibility for interlayer scattering, where interactions are mediated by transfer momenta or from in neighbouring layer. Using angle-resolved photoemission spectroscopy study a graphene InSe heterostructure, we present evidence that...

10.1088/2053-1583/abc13e article EN cc-by 2D Materials 2020-10-29

Two-dimensional semiconductors offer a compelling platform for excitons with robust interaction light, owing to their confined nature and numerous manipulable degrees of freedom. In bilayers, interlayer (IX) combine these freedom high interactions due out-of-plane alignment. However, oscillator strength is often negligible. Interlayer hybridization provides IX significant strength. Here, we examine the ultrafast dynamics hybrid in bilayer trilayer MoSe<sub>2</sub>. We find that are...

10.1117/12.3022451 article EN 2024-06-10

Quantinuum’s trapped-ion quantum computer utilizes the QCCD architecture which exhibits high-fidelity operations, mid-circuit measurements, and full connectivity. This talk discusses how we can address scaling challenges with visible-light integrated photonics to facilitate large-scale computing. Full-text article not available; see video presentation

10.1364/ofc.2024.w4k.3 article EN Optical Fiber Communication Conference (OFC) 2022 2024-01-01

Integrated metasurfaces can miniaturize, stabilize, and scale optical systems for trappedion quantum computing. We demonstrate monolithic integration of with waveguide/grating devices, fabrication ITO visible frequencies, transparent polarization control beam forming.

10.1364/cleo_at.2024.ath5a.7 article EN 2024-01-01

Quantinuum has developed a trapped-ion quantum computer based on the QCCD architecture which exhibits high-delity operations, mid-circuit measurements and full connectivity. This talk will introduce discuss how we can address scaling challenges with integrated photonics for visible light to facilitate large-scale computing.

10.1117/12.3008419 article EN 2023-11-30

In two-dimensional heterostructures, crystalline atomic layers with differing lattice parameters can stack directly one on another. The resultant close proximity of lattices periodicity lead to new phenomena. For umklapp processes, this opens the possibility for interlayer scattering, where interactions are mediated by transfer momenta or from in neighbouring layer. Using angle-resolved photoemission spectroscopy study a graphene InSe heterostructure, we present evidence that processes cause...

10.48550/arxiv.2008.12079 preprint EN other-oa arXiv (Cornell University) 2020-01-01
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