Hyobin Yoo
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View article: In-situ fabrication of GaN/short-range ordered BN heterostructure light-emitting diodes
In-situ fabrication of GaN/short-range ordered BN heterostructure light-emitting diodes Open
We fabricated GaN/BN double heterostructure light-emitting diodes (LEDs) where the BN layer exhibited an amorphous-like short-range order and facilitated the in-situ epitaxial lateral overgrowth (ELOG) of GaN films. Using an identical meta…
View article: Double-sided van der Waals epitaxy of topological insulators across an atomically thin membrane
Double-sided van der Waals epitaxy of topological insulators across an atomically thin membrane Open
Atomically thin van der Waals (vdW) films provide a novel material platform for epitaxial growth of quantum heterostructures. However, unlike the remote epitaxial growth of three-dimensional bulk crystals, the growth of two-dimensional (2D…
View article: Nanoscale Investigation of the Effect of Annealing Temperature on the Polarization Switching Dynamics of Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub> Thin Films
Nanoscale Investigation of the Effect of Annealing Temperature on the Polarization Switching Dynamics of Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub> Thin Films Open
Recently, HfO 2 ‐based ferroelectric thin films have attracted widespread interest in developing next‐generation nonvolatile memories. To form a metastable ferroelectric orthorhombic phase in HfO 2 , a post‐annealing process is typically n…
View article: Unconventional domain tessellations in moiré-of-moiré lattices
Unconventional domain tessellations in moiré-of-moiré lattices Open
Imposing incommensurable periodicity on the periodic atomic lattice can lead to complex structural phases consisting of locally periodic structure bounded by topological defects. Twisted trilayer graphene (TTG) is an ideal material platfor…
View article: Time-reversal symmetry breaking superconductivity between twisted cuprate superconductors
Time-reversal symmetry breaking superconductivity between twisted cuprate superconductors Open
Twisted interfaces between stacked van der Waals (vdW) cuprate crystals present a platform for engineering superconducting order parameters by adjusting stacking angles. Using a cryogenic assembly technique, we construct twisted vdW Joseph…
View article: Replication Data for: Time-Reversal Symmetry Breaking Superconductivity between Twisted Cuprate Superconductors
Replication Data for: Time-Reversal Symmetry Breaking Superconductivity between Twisted Cuprate Superconductors Open
Replication Data for the article entitled "Time-Reversal Symmetry Breaking Superconductivity between Twisted Cuprate Superconductors"
View article: Source data for paper "Operando electron microscopy investigation of polar domain dynamics in twisted van der Waals homobilayers"
Source data for paper "Operando electron microscopy investigation of polar domain dynamics in twisted van der Waals homobilayers" Open
Source data for paper "Operando electron microscopy investigation of polar domain dynamics in twisted van der Waals homobilayers"
View article: Source data for paper "Operando electron microscopy investigation of polar domain dynamics in twisted van der Waals homobilayers"
Source data for paper "Operando electron microscopy investigation of polar domain dynamics in twisted van der Waals homobilayers" Open
Source data for paper "Operando electron microscopy investigation of polar domain dynamics in twisted van der Waals homobilayers"
View article: Torsional periodic lattice distortions and diffraction of twisted 2D materials
Torsional periodic lattice distortions and diffraction of twisted 2D materials Open
Twisted 2D materials form complex moiré structures that spontaneously reduce symmetry through picoscale deformation within a mesoscale lattice. We show twisted 2D materials contain a torsional displacement field comprised of three transver…
View article: Non-Abelian topological defects and strain mapping in 2D moiré materials
Non-Abelian topological defects and strain mapping in 2D moiré materials Open
We present a general method to analyze the topological nature of the domain boundary connectivity that appeared in relaxed moiré superlattice patterns at the interface of 2-dimensional (2D) van der Waals (vdW) materials. At large enough mo…
View article: Torsional Periodic Lattice Distortions and Diffraction of Twisted 2D Materials
Torsional Periodic Lattice Distortions and Diffraction of Twisted 2D Materials Open
Twisted 2D materials form complex moiré structures that spontaneously reduce symmetry through picoscale deformation within a mesoscale lattice. We show twisted 2D materials contain a torsional displacement field comprised of three transver…
View article: Torsional Periodic Lattice Distortions and Diffraction of Twisted 2D Materials
Torsional Periodic Lattice Distortions and Diffraction of Twisted 2D Materials Open
TorsionalPLD_SAEDs.zip: Raw Gatan format (.dm3, .dm4) selected area electron diffraction (SAED) patterns of several twisted materials, including twisted bilayer graphene. TorsionalPLD_SAED_Simulation.zip: These software parameter files si…
View article: Emergent Interfacial Superconductivity between Twisted Cuprate Superconductors
Emergent Interfacial Superconductivity between Twisted Cuprate Superconductors Open
Twisted interfaces between stacked van der Waals cuprate crystals enable tunable Josephson coupling between in-plane anisotropic superconducting order parameters. Employing a novel cryogenic assembly technique, we fabricate Josephson junct…
View article: Dual-Gated Graphene Devices for Near-Field Nano-imaging
Dual-Gated Graphene Devices for Near-Field Nano-imaging Open
Graphene-based heterostructures display a variety of phenomena that are strongly tunable by electrostatic local gates. Monolayer graphene (MLG) exhibits tunable surface plasmon polaritons, as revealed by scanning nano-infrared experiments.…
View article: Imaging of 2-Dimensional Dislocation Networks in Twisted Bilayer Graphene and Beyond
Imaging of 2-Dimensional Dislocation Networks in Twisted Bilayer Graphene and Beyond Open
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View article: Nano-photocurrent Mapping of Local Electronic Structure in Twisted Bilayer Graphene
Nano-photocurrent Mapping of Local Electronic Structure in Twisted Bilayer Graphene Open
We report a combined nano-photocurrent and infrared nanoscopy study of twisted bilayer graphene (TBG) enabling access to the local electronic phenomena at length scales as short as 20 nm. We show that the photocurrent changes sign at carri…
View article: Reply to P. Ao's Comment on "Sign reversing Hall effect in atomically thin high temperature superconductors"
Reply to P. Ao's Comment on "Sign reversing Hall effect in atomically thin high temperature superconductors" Open
We respond to P. Ao's comment in arXiv:1907.09263, which suggests that vortex many-body effects are the origin of Hall sign reversal in few-unit-cell thick Bi-2212 cuprate crystals (Phys. Rev. Lett. 122, 247001 (2019)). Our experimental re…
View article: Photonic crystals for nano-light in moiré graphene superlattices
Photonic crystals for nano-light in moiré graphene superlattices Open
Graphene is an atomically thin plasmonic medium that supports highly confined plasmon polaritons, or nano-light, with very low loss. Electronic properties of graphene can be drastically altered when it is laid upon another graphene layer, …
View article: Photonic crystals for nano-light in moiré graphene superlattices
Photonic crystals for nano-light in moiré graphene superlattices Open
Twisting a route for surface plasmons Graphene is an atomically thin material that supports highly confined plasmon polaritons, or nano-light, with very low loss. The properties of graphene can be made richer by introducing and then rotati…
View article: Sign reversing Hall effect in atomically thin high temperature superconductors
Sign reversing Hall effect in atomically thin high temperature superconductors Open
We fabricate van der Waals heterostructure devices using few unit cell thick Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ for magnetotransport measurements. The superconducting transition temperature and carrier density in atomically thin samples can be …
View article: Measuring the Local Twist Angle and Layer Arrangement in Van der Waals Heterostructures
Measuring the Local Twist Angle and Layer Arrangement in Van der Waals Heterostructures Open
The properties of Van der Waals (VdW) heterostructures are determined by the twist angle and the interface between adjacent layers as well as their polytype and stacking. Here, the use of spectroscopic low energy electron microscopy (LEEM)…
View article: Atomic reconstruction at van der Waals interface in twisted bilayer graphene
Atomic reconstruction at van der Waals interface in twisted bilayer graphene Open
Interfaces between crystalline materials have been an essential engineering platform for modern electronics. At the interfaces in two-dimensional (2D) van der Waals (vdW) heterostructures, the twist-tunability offered by vdW crystals allow…
View article: Heterointerface effects in the electro-intercalation of van der Waals heterostructures
Heterointerface effects in the electro-intercalation of van der Waals heterostructures Open
Molecular-scale manipulation of electronic/ionic charge accumulation in materials is a preeminent challenge, particularly in electrochemical energy storage. Layered van der Waals (vdW) crystals exemplify a diverse family of materials that …
View article: Structural-relaxation-driven electron doping of amorphous oxide semiconductors by increasing the concentration of oxygen vacancies in shallow-donor states
Structural-relaxation-driven electron doping of amorphous oxide semiconductors by increasing the concentration of oxygen vacancies in shallow-donor states Open
The electronic states of oxygen vacancies (VO s) in amorphous oxide semiconductors are shallow donors, deep donors or electron traps; these are determined by the local atomic structure. Because the amorphous phase is metastable compared wi…