Hyeonjun Baek
YOU?
Author Swipe
View article: Wavelength-tunable Zn1−xMgxO nanotube lasers on graphene films
Wavelength-tunable Zn1−xMgxO nanotube lasers on graphene films Open
Wavelength-tunable lasers on various substrates, such as silicon and metal, are crucial for emerging optoelectronic applications such as photonic chip communication and biological optical probes. Here, we report on Zn1−xMgxO (0≤x≤0.07) nan…
View article: Quadrupolar and Dipolar Excitons in Bilayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2</mml:mn><mml:mi>H</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mi>MoSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Quadrupolar and Dipolar Excitons in Bilayer Open
We report the experimental observation of quadrupolar exciton states in the reflectance contrast spectrum of 2H-stacked bilayer MoSe2. The application of a vertical electric field results in a quadratic energy redshift of these quadrupolar…
View article: MoTe<sub>2</sub> synaptic transistor and its application to physical reservoir computing
MoTe<sub>2</sub> synaptic transistor and its application to physical reservoir computing Open
This work demonstrated that MoTe 2 -based synaptic transistors can be utilized in physical reservoir computing, showing promise for energy-efficient AI.
View article: Highly tunable ground and excited state excitonic dipoles in multilayer 2H-MoSe2
Highly tunable ground and excited state excitonic dipoles in multilayer 2H-MoSe2 Open
The fundamental properties of an exciton are determined by the spin, valley, energy, and spatial wavefunctions of the Coulomb-bound electron and hole. In van der Waals materials, these attributes can be widely engineered through layer stac…
View article: The interplay of field-tunable strongly correlated states in a multi-orbital moiré system
The interplay of field-tunable strongly correlated states in a multi-orbital moiré system Open
The interplay of charge, spin, lattice and orbital degrees of freedom leads to a variety of emergent phenomena in strongly correlated systems. In transition-metal-dichalcogenide-based moiré heterostructures, recent observations of correlat…
View article: The interplay of field-tunable strongly correlated states in a multi-orbital moiré system
The interplay of field-tunable strongly correlated states in a multi-orbital moiré system Open
The interplay of charge, spin, lattice, and orbital degrees of freedom leads to a wide range of emergent phenomena in strongly correlated systems. In heterobilayer transition metal dichalcogenide moiré systems, recent observations of Mott …
View article: Highly Tunable Ground and Excited State Excitonic Dipoles in Multilayer 2H-MoSe$_2$
Highly Tunable Ground and Excited State Excitonic Dipoles in Multilayer 2H-MoSe$_2$ Open
The fundamental properties of an exciton are determined by the spin, valley, energy, and spatial wavefunctions of the Coulomb bound electron and hole. In van der Waals materials, these attributes can be widely engineered through layer stac…
View article: Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice
Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice Open
Two-dimensional moiré materials provide a highly tunable platform to investigate strongly correlated electronic states. Such emergent many-body phenomena can be optically probed in moiré systems created by stacking two layers of transition…
View article: 2×N twin-field quantum key distribution network configuration based on polarization, wavelength, and time division multiplexing
2×N twin-field quantum key distribution network configuration based on polarization, wavelength, and time division multiplexing Open
Developing quantum key distribution (QKD) has been recently directed toward distance extension and network expansion for real-world secure communications. Considering a recent report on a quantum communication network over 4,600 km, it see…
View article: Exciton-polarons in the presence of strongly correlated electronic states in a MoSe$_2$/WSe$_2$ moiré superlattice
Exciton-polarons in the presence of strongly correlated electronic states in a MoSe$_2$/WSe$_2$ moiré superlattice Open
Two-dimensional moiré materials provide a highly tunable platform to investigate strongly correlated electronic states. Such emergent many-body phenomena can be optically probed in moiré systems created by stacking two layers of transition…
View article: Electrically driven strain-induced deterministic single-photon emitters in a van der Waals heterostructure
Electrically driven strain-induced deterministic single-photon emitters in a van der Waals heterostructure Open
Deterministic single-photon emitters were demonstrated in an indented van der Waals heterostructure by electrical pumping.
View article: Optical read-out of Coulomb staircases in a moiré superlattice via trapped interlayer trions
Optical read-out of Coulomb staircases in a moiré superlattice via trapped interlayer trions Open
View article: Moiré-Trapped Interlayer Trions in a Charge-Tunable <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>WSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>/</mml:mo><mml:msub><mml:mrow><mml:mi>MoSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> Heterobilayer
Moiré-Trapped Interlayer Trions in a Charge-Tunable Heterobilayer Open
Transition metal dichalcogenide heterobilayers offer attractive opportunities\nto realize lattices of interacting bosons with several degrees of freedom. Such\nheterobilayers can feature moir\\'e patterns that modulate their electronic ban…
View article: Highly sensitive and flexible pressure sensors using position- and dimension-controlled ZnO nanotube arrays grown on graphene films
Highly sensitive and flexible pressure sensors using position- and dimension-controlled ZnO nanotube arrays grown on graphene films Open
A facile and novel technique for the fabrication of pressure sensors is reported based on the hybridization of one-dimensional nanomaterials and two-dimensional graphene film. In particular, piezoelectric pressure sensors are fabricated by…
View article: Electrically driven strain-induced deterministic single-photon emitters in a van der Waals heterostructure
Electrically driven strain-induced deterministic single-photon emitters in a van der Waals heterostructure Open
Quantum confinement in atomically-thin TMDCs enables the realization of deterministic single-photon emitters. The position and polarization control of single photons have been achieved via local strain engineering using nanostructures. How…
View article: Vertical monolithic integration of wide- and narrow-bandgap semiconductor nanostructures on graphene films
Vertical monolithic integration of wide- and narrow-bandgap semiconductor nanostructures on graphene films Open
We report monolithic integration of indium arsenide (InAs) nanorods and zinc oxide (ZnO) nanotubes using a multilayer graphene film as a suspended substrate, and the fabrication of dual-wavelength photodetectors with the hybrid configurati…
View article: Intracellular gallium nitride microrod laser
Intracellular gallium nitride microrod laser Open
We report laser emission from gallium nitride (GaN) microrods that are introduced into mammalian cells and the application of these microrods for cell labeling. GaN microrods were grown on graphene-coated SiO 2 /Si substrates by metal-orga…
View article: Highly energy-tunable quantum light from moiré-trapped excitons
Highly energy-tunable quantum light from moiré-trapped excitons Open
Photon antibunching, a hallmark of quantum light, is observed from moiré-trapped interlayer excitons in a 2D heterobilayer.
View article: Individually addressable, high-density vertical nanotube Schottky diode crossbar array
Individually addressable, high-density vertical nanotube Schottky diode crossbar array Open
We report on the fabrication of individually addressable, high-density vertical zinc oxide (ZnO) nanotube Schottky diode arrays. The individually addressable nanotube Schottky diode arrays were fabricated by arranging the top and bottom el…
View article: Highly tunable quantum light from moiré trapped excitons
Highly tunable quantum light from moiré trapped excitons Open
Photon antibunching, a hallmark of quantum light, has been observed in the correlations of light from isolated atomic and atomic-like solid-state systems. Two-dimensional semiconductor heterostructures offer a unique method to create a qua…
View article: ZnO nanotube waveguide arrays on graphene films for local optical excitation on biological cells
ZnO nanotube waveguide arrays on graphene films for local optical excitation on biological cells Open
We report on scalable and position-controlled optical nanoprobe arrays using ZnO nanotube waveguides on graphene films for use in local optical excitation. For the waveguide fabrication, position-controlled and well-ordered ZnO nanotube ar…
View article: Real-time device-scale imaging of conducting filament dynamics in resistive switching materials
Real-time device-scale imaging of conducting filament dynamics in resistive switching materials Open
View article: Direct observation of Li diffusion in Li-doped ZnO nanowires
Direct observation of Li diffusion in Li-doped ZnO nanowires Open
The direct observation of Li diffusion in Li-doped zinc oxide nanowires (NWs) was realized by using in situ heating in the scanning transmission electron microscope (STEM). A continuous increase of low atomic mass regions within a single N…
View article: Distinctive mapping of strain and quantum size effects using depth-resolved photoluminescence in ZnO nanoneedles
Distinctive mapping of strain and quantum size effects using depth-resolved photoluminescence in ZnO nanoneedles Open
In order to locate the spatially resolved influence of the strain, carrier localization, and quantum size effect (QSE) in tapered ZnO nanoneedles (NNs), the photoluminescence (PL) was measured as a function of the incident laser angle θ fr…
View article: Growth and optical characteristics of high-quality ZnO thin films on graphene layers
Growth and optical characteristics of high-quality ZnO thin films on graphene layers Open
We report the growth of high-quality, smooth, and flat ZnO thin films on graphene layers and their photoluminescence (PL) characteristics. For the growth of high-quality ZnO thin films on graphene layers, ZnO nanowalls were grown using met…