225 citations · 1.7k across the 33 of their papers we have counts for
35 papers
In-situ scanning tunneling microscopy observation of thickness-dependent air-sensitive layered materials and heterodevices
Hyoung Kug Kim, Dowook Kim, Dong Guk Lee +5
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 wea…
Robust Interlayer-Coherent Quantum Hall States in Twisted Bilayer Graphene
Dohun Kim, Byungmin Kang, Yong-Bin Choi +5
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 re…
Twisted van der Waals Josephson junction based on high-Tc superconductor
Jongyun Lee, Wonjun Lee, Gi-Yeop Kim +8
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 layere…
Impact angle control of local intense d/d variations during shock-induced substorms
Denny M. Oliveira, James M. Weygand, Eftyhia Zesta +7
The impact of interplanetary shocks on the magnetosphere can trigger magnetic substorms that intensify auroral electrojet currents. These currents enhance ground magnetic field per…
Steady Floquet-Andreev States Probed by Tunnelling Spectroscopy
Sein Park, Wonjun Lee, Seong Jang +7
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 ge…
Characterization of Shapiro steps in the presence of a 4π-periodic Josephson current
Jinho Park, Yong-Bin Choi, Gil-Ho Lee +1
The Majorana zero-energy modes (MZMs) residing at the boundary of topological superconductors have attracted a great deal of interest recently, as they provide a platform to explor…
Spin-orbit Torque Switching in an All-Van der Waals Heterostructure
Inseob Shin, Won Joon Cho, Eun-Su An +14
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.…
Angstrom-wide conductive channels in black phosphorus by Cu intercalation
Suk Woo Lee, Lu Qiu, Jong Chan Yoon +8
Intercalation is an effective method to improve and modulate properties of two-dimensional materials. Even so, spatially controlled intercalation at atomic scale, which is importan…
Josephson-junction infrared single-photon detector
Evan D. Walsh, Woochan Jung, Gil-Ho Lee +9
Josephson junctions (JJs) are ubiquitous superconducting devices, enabling high sensitivity magnetometers and voltage amplifiers, as well as forming the basis of high performance c…
Strongly-bound excitons and trions in anisotropic 2D semiconductors
Sangho Yoon, Taeho Kim, Seung-Young Seo +9
Monolayer and few-layer phosphorene are anisotropic quasi-two-dimensional (quasi-2D) van der Waals (vdW) semiconductors with a linear-dichroic light-matter interaction and a widely…
Imaging Andreev Reflection in Graphene
S. Bhandari, G. -H. Lee, K. Watanabe +3
Coherent charge transport along ballistic paths can be introduced into graphene by Andreev reflection, for which an electron reflects from a superconducting contact as a hole, whil…
Lattice dynamics and spin-phonon interaction in strained NiO films
Alireza Kashir, Veronica Goian, Daseob Yoon +4
NiO thin films with various strains were grown on SrTiO3 (STO) and MgO substrates using a pulsed laser deposition technique. The films were characterized using an x-ray diffractome…
GLIMPSE: Graphene-based super-Light Invisible Matter Particle SEarch
Doojin Kim, Jong-Chul Park, Gil-Ho Lee +1
We propose a new dark-matter detection strategy that will potentially enable the search for super-light dark matter keV, improving the minimum detectable mass by mo…
Imaging the Flow of Holes from a Collimating Contact in Graphene
Sagar Bhandari, Mary Kreidel, Alexander Kelser +5
A beam of holes formed in graphene by a collimating contact is imaged using a liquid-He cooled scanning probe microscope (SPM). The mean free path of holes is greater than the devi…
Evidence of Higher Order Topology in Multilayer WTe from Josephson Coupling through Anisotropic Hinge States
Yong-Bin Choi, Yingming Xie, Chui-Zhen Chen +12
The noncentrosymmetric Td-WTe, previously known as a type-II Weyl semimetal, is expected to have higher order topological phases with topologically protected, helical one-dimen…
Graphene-based Josephson junction microwave bolometer
Gil-Ho Lee, Dmitri K. Efetov, Woochan Jung +8
Sensitive microwave detectors are critical instruments in radioastronomy, dark matter axion searches, and superconducting quantum information science. The conventional strategy tow…
Spin-phonon interaction increased by compressive strain in antiferromagnetic MnO thin films
Alireza Kashir, Veronica Goian, Oliva Pacherova +3
MnO thin films with various thicknesses and strains were grown on MgO substrates by pulsed laser deposition, then characterized using x-ray diffraction and infrared reflectance spe…
Strain-induced increase of dielectric constant in EuO thin film
Alireza Kashir, Hyeon-Woo Jeong, Woochan Jung +2
Recently, lattice dynamics of the highly strained europium monoxide, as a promising candidate for strong ferroelectric-ferromagnet material, applied in the next-generation storage…
Dielectric properties of strained NiO thin films
Alireza Kashir, Hyeon-Woo Jeong, Gil-ho Lee +2
The dielectric properties of NiO thin films grown by pulsed laser deposition have been studied as a function of strain at temperature from 10 to 300 K. Above 150 K, the contributio…
Pulsed Laser Deposition of Rocksalt Magnetic Binary Oxides
Alireza Kashir, Hyeon-Woo Jeong, Gil-ho Lee +2
Here we systematically explore the use of pulsed laser deposition technique (PLD) to grow three basic oxides that have rocksalt structure but different chemical stability in the am…
Impact of geometry and non-idealities on electron 'optics' based graphene p-n junction devices
Mirza M. Elahi, K. M. Masum Habib, Ke Wang +3
We articulate the challenges and opportunities of unconventional devices using the photon like flow of electrons in graphene, such as Graphene Klein Tunnel (GKT) transistors. The u…
Asymmetric Josephson Effect in Inversion Symmetry Breaking Topological Materials
Chui-Zhen Chen, James Jun He, Mazhar Ali +3
Topological materials which possess topologically protected surface states have attracted much attention in recent years. In this work, we study the critical current of superconduc…
Short Ballistic Josephson Coupling in Planar Graphene Junctions with Inhomogeneous Carrier Doping
Jinho Park, Jae Hyeong Lee, Gil-Ho Lee +5
We report on short ballistic (SB) Josephson coupling in junctions embedded in a planar heterostructure of graphene. Ballistic Josephson coupling is confirmed by the Fabry-Perot-typ…
Logarithmic singularities and quantum oscillations in magnetically doped topological insulators
Debaleena Nandi, Inti Sodemann, Kevin Shain +9
We report magnetotransport measurements on magnetically doped (Bi,Sb)Te films grown by molecular beam epitaxy. In Hallbar devices, logarithmic dependence on temperature and…