Gil‐Ho Lee
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View article: Correlated interlayer quantum Hall state in large-angle twisted trilayer graphene
Correlated interlayer quantum Hall state in large-angle twisted trilayer graphene Open
Trilayer graphene allows systematic control of its electronic structure through stacking sequence and twist geometry, providing a versatile platform for correlated states. Here we report magnetotransport in alternating twisted trilayer gra…
View article: Gated <i>PN</i> Junction in Ambipolar MoS<sub>2</sub> for Superior Self‐Powered Photodetection
Gated <i>PN</i> Junction in Ambipolar MoS<sub>2</sub> for Superior Self‐Powered Photodetection Open
Self‐powered photodetectors (SPPDs) have attracted significant attention as a key component of future technologies that require ultra‐low power consumption, such as mobile edge devices. Molybdenum disulfide (MoS 2 ), a representative van d…
View article: Preserving Twist-Angle in Marginally Twisted Double-Bilayer Graphene Devices during Fabrication: Implications for Highly Uniform Superlattice Device Applications
Preserving Twist-Angle in Marginally Twisted Double-Bilayer Graphene Devices during Fabrication: Implications for Highly Uniform Superlattice Device Applications Open
Twisted van der Waals heterostructures provide a platform for studying a wide range of electron correlation phenomena, including unconventional superconductivity and correlated insulating states. However, fabricating such devices is challe…
View article: Tunneling spectroscopy of Andreev bands in multiterminal graphene-based Josephson junctions
Tunneling spectroscopy of Andreev bands in multiterminal graphene-based Josephson junctions Open
Multiply connected electronic networks threaded by flux tubes have been proposed as a platform for adiabatic quantum transport and topological states. Multiterminal Josephson junction (MTJJ) has been suggested as a pathway to realize this …
View article: Ballistic transport in nanodevices based on single-crystalline Cu thin films
Ballistic transport in nanodevices based on single-crystalline Cu thin films Open
In ballistic transport, the movement of charged carriers remains unimpeded by scattering events. In this limit, microscopic parameters such as crystal momentum, spin and quantum phases are well conserved, allowing electrons to maintain the…
View article: Unveiling Topological Hinge States in the Higher-Order Topological Insulator WTe$_2$ Based on the Fractional Josephson Effect
Unveiling Topological Hinge States in the Higher-Order Topological Insulator WTe$_2$ Based on the Fractional Josephson Effect Open
Higher-order topological insulators (HOTIs) represent a novel class of topological materials, characterised by the emergence of topological boundary modes at dimensions two or more lower than those of bulk materials. Recent experimental st…
View article: Edge dependece of nonlocal transport in gapped bilayer graphene
Edge dependece of nonlocal transport in gapped bilayer graphene Open
The topological properties of gapped graphene have been explored for valleytronics applications. Prior transport experiments indicated their topological nature through large nonlocal resistance in Hall-bar devices, but the origin of this r…
View article: Engineering Superconducting Contacts Transparent to a Bipolar Graphene
Engineering Superconducting Contacts Transparent to a Bipolar Graphene Open
Graphene's exceptional electronic mobility, gate-tunability, and contact transparency with superconducting materials make it ideal for exploring the superconducting proximity effect. However, the work function difference between graphene a…
View article: Engineering superconducting contacts transparent to a bipolar graphene
Engineering superconducting contacts transparent to a bipolar graphene Open
Graphene's exceptional electronic mobility, gate-tunability, and contact transparency with superconducting materials make it ideal for exploring the superconducting proximity effect. However, the work function difference between graphene a…
View article: Full tomography of topological Andreev bands in graphene Josephson junctions
Full tomography of topological Andreev bands in graphene Josephson junctions Open
Multiply connected electronic networks threaded by flux tubes have been proposed as a platform for adiabatic quantum transport and topological states. Multi-terminal Josephson junction (MTJJ) has been suggested as a pathway to realize this…
View article: Graphene calorimetric single-photon detector
Graphene calorimetric single-photon detector Open
Single photon detectors (SPDs) are essential technology in quantum science, quantum network, biology, and advanced imaging. To detect the small quantum of energy carried in a photon, conventional SPDs rely on energy excitation across eithe…
View article: Synergistic polar states by selective atomic gradients
Synergistic polar states by selective atomic gradients Open
Materials that combine distinct properties within a single phase are of fundamental and technological interest1–9. However, it is challenging to harmoniously combine various properties, particularly since some physical properties are inher…
View article: Highly Efficient Room‐Temperature Spin‐Orbit‐Torque Switching in a Van der Waals Heterostructure of Topological Insulator and Ferromagnet
Highly Efficient Room‐Temperature Spin‐Orbit‐Torque Switching in a Van der Waals Heterostructure of Topological Insulator and Ferromagnet Open
All‐Van der Waals (vdW)‐material‐based heterostructures with atomically sharp interfaces offer a versatile platform for high‐performing spintronic functionalities at room temperature. One of the key components is vdW topological insulators…
View article: Performance limits due to thermal transport in graphene single-photon bolometers
Performance limits due to thermal transport in graphene single-photon bolometers Open
In high-sensitivity bolometers and calorimeters, the photon absorption often occurs at a finite distance from the temperature sensor to accommodate antennas or avoid the degradation of superconducting circuitry exposed to radiation. As a r…
View article: Controllable Andreev Bound States in Bilayer Graphene Josephson Junction from Short to Long Junction Limits
Controllable Andreev Bound States in Bilayer Graphene Josephson Junction from Short to Long Junction Limits Open
We demonstrate that the mode number of Andreev bound states in bilayer graphene Josephson junctions can be modulated by in situ control of the superconducting coherence length. By exploiting the quadratic band dispersion of bilayer graphen…
View article: Performance limits due to thermal transport in graphene single-photon bolometers
Performance limits due to thermal transport in graphene single-photon bolometers Open
In high-sensitivity bolometers and calorimeters, the photon absorption often occurs at a finite distance from the temperature sensor to accommodate antennas or avoid the degradation of superconducting circuitry exposed to radiation. As a r…
View article: In-situ scanning tunneling microscopy observation of thickness-dependent air-sensitive layered materials and heterodevices
In-situ scanning tunneling microscopy observation of thickness-dependent air-sensitive layered materials and heterodevices Open
Quasi-two-dimensional (Quasi-2D) van der Waals (vdW) materials can be mechanically or chemically exfoliated down to monolayer because of their strong intralayer bonding and the weak interlayer vdW interaction. Thanks to this unique propert…
View article: Robust Interlayer-Coherent Quantum Hall States in Twisted Bilayer Graphene
Robust Interlayer-Coherent Quantum Hall States in Twisted Bilayer Graphene Open
We introduce a novel two-dimensional electronic system with ultrastrong interlayer interactions, namely, twisted bilayer graphene with a large twist angle, as an ideal ground for realizing interlayer-coherent excitonic condensates. In thes…
View article: Twisted van der Waals Josephson Junction Based on a High-<i>T</i><sub>c</sub> Superconductor
Twisted van der Waals Josephson Junction Based on a High-<i>T</i><sub>c</sub> Superconductor Open
Stacking two-dimensional van der Waals (vdW) materials rotated with respect to each other show versatility for studying exotic quantum phenomena. In particular, anisotropic layered materials have great potential for such twistronics applic…
View article: Twisted van der Waals Josephson junction based on high-Tc superconductor
Twisted van der Waals Josephson junction based on high-Tc superconductor Open
Stacking two-dimensional van der Waals (vdW) materials rotated with respect to each other show versatility for the study of exotic quantum phenomena. Especially, anisotropic layered materials have great potential for such twistronics appli…
View article: Characterization of Shapiro steps in the presence of a 4π-periodic Josephson current
Characterization of Shapiro steps in the presence of a 4π-periodic Josephson current Open
The Majorana zero-energy modes (MZMs) residing at the boundary of topological\nsuperconductors have attracted a great deal of interest recently, as they\nprovide a platform to explore fundamental physics such as non-Abelian\nstatistics, as…
View article: Steady Floquet-Andreev States Probed by Tunnelling Spectroscopy
Steady Floquet-Andreev States Probed by Tunnelling Spectroscopy Open
Engineering quantum states through light-matter interaction has created a new paradigm in condensed matter physics. A representative example is the Floquet-Bloch state, which is generated by time-periodically driving the Bloch wavefunction…
View article: Anisotropic Angstrom-Wide Conductive Channels in Black Phosphorus by Top-down Cu Intercalation
Anisotropic Angstrom-Wide Conductive Channels in Black Phosphorus by Top-down Cu Intercalation Open
Intercalation in black phosphorus (BP) can induce and modulate a variety of the properties including superconductivity like other two-dimensional (2D) materials. In this perspective, spatially controlled intercalation has the possibility t…
View article: Imaging Electrons in Two Dimensional Materials (Final report)
Imaging Electrons in Two Dimensional Materials (Final report) Open
Two-dimensional (2D) materials have extraordinary characteristics that offer promising new approaches for science and technology. Electrons in graphene can move ballistically through a sheet, even though it is only a single atom thick. And…
View article: Spin-orbit Torque Switching in an All-Van der Waals Heterostructure
Spin-orbit Torque Switching in an All-Van der Waals Heterostructure Open
Current-induced control of magnetization in ferromagnets using spin-orbit torque (SOT) has drawn attention as a new mechanism for fast and energy efficient magnetic memory devices. Energy-efficient spintronic devices require a spin-current…