98 citations · 208 across the 25 of their papers we have counts for
27 papers
Physics-constrained machine learning for decoding multi-nanobubble configurations in graphene
Jihye Kim, Taegeun Song, Nojoon Myoung
Identifying multiple graphene nanobubbles from electronic spectra is challenging because their strain-induced features overlap. We develop a physics-constrained machine-learning fr…
Strain-Induced Detuning of a Dressed Nitrogen-Vacancy Qubit: Effective Two-Level Theory and Its Validity
Jihyeon Jeon, Donghun Lee, Seok-Kyun Son +1
The nitrogen-vacancy (NV) center in diamond can be operated as a microwave-dressed qubit. In the ideal two-level limit, its transition frequency is first-order insensitive to stati…
Defying Diamagnetism: Anomalous Redshift and Robust Chiral Spin Mixing in 2D Perovskites under High Magnetic Fields up to 50 T
D. Y. Park, S. Park, Yongmin Kim +4
We report circularly polarized magneto-photoluminescence (MPL) measurements on the enantiomeric pair of two-dimensional chiral perovskites R- and S-(C4H9NH3)2PbI4 in pulsed magneti…
Electrically tunable spin qubits in strain-engineered graphene p-n junctions
Myung-Chul Jung, Nojoon Myoung
Strain engineering enables quantum confinement in pristine graphene without degrading its intrinsic mobility and spin coherence. Here, we extend previously proposed strain-induced…
Radio-Frequency Detection of Fabry-Pérot Interference and Quantum Capacitance in Long-Channel Three-Dimensional Dirac Semimetal Cd3As2 Nanowires
Sung Jin An, Jisu Kim, Myung-Chul Jung +10
We demonstrate phase-coherent transport in suspended long-channel Cd3As2 nanowire devices using both direct current (DC) transport and radio-frequency (RF) reflectometry measuremen…
Asymmetric-gate Mach--Zehnder interferometry in graphene: Multi-path conductance oscillations and visibility characteristics
Taegeun Song, Nojoon Myoung
Graphene provides an excellent platform for investigating electron quantum interference due to its outstanding coherent properties. In the quantum Hall regime, Mach--Zehnder (MZ) e…
Quantum-Hall Spectroscopy of Elliptically Deformed Graphene Nanobubble Qubits
Myung-Chul Jung, Nojoon Myoung
With recent advances in strain-engineering technology of graphene and 2D materials, graphene quantum dots (QDs) defined by the strain-induced pseudo-magnetic fields (PMFs) have bee…
Magnetic steganography based on wide field diamond quantum microscopy
Jungbae Yoon, Jugyeong Jeong, Hyunjun Jang +5
We experimentally demonstrate magnetic steganography using wide field quantum microscopy based on diamond nitrogen vacancy centers. The method offers magnetic imaging capable of re…
Nanowrinkle Waveguide in Graphene for Enabling Secure Dirac Fermion Transport
Seunghyun Jun, Myung-Chul Jung, Nojoon Myoung
Localized states in graphene have garnered significant attention in quantum information science due to their potential applications. Despite graphene's superior transport and elect…
Neural network-based recognition of multiple nanobubbles in graphene
Subin Kim, Nojoon Myoung, Seunghyun Jun +1
We present a machine learning method for swiftly identifying nanobubbles in graphene, crucial for understanding electronic transport in graphene-based devices. Nanobubbles cause lo…
Detecting Strain Effects due to Nanobubbles in Graphene Mach-Zehnder Interferometers
Nojoon Myoung, Taegeun Song, Hee Chul Park
We investigate the effect of elastic strain on a Mach-Zehnder (MZ) interferometer created by graphene p-n junction in quantum Hall regime. We demonstrate that a Gaussian-shaped nan…
Electronic Mach-Zehnder interference in a bipolar hybrid monolayer-bilayer graphene junction
M. Mirzakhani, N. Myoung, F. M. Peeters +1
Graphene matter in a strong magnetic field, realizing one-dimensional quantum Hall channels, provides a unique platform for studying electron interference. Here, using the Landauer…
A strain-engineered graphene qubit in a nanobubble
Nojoon Myoung, JungYun Han, Hee Chul Park
We propose a controllable qubit in a graphene nanobubble with emergent two-level systems induced by pseudo-magnetic fields. We found that double quantum dots can be created by the…
Topological edge states in bowtie ladders with different cutting edges
Jung-Wan Ryu, Sungjong Woo, Nojoon Myoung +1
We have studied topological edge states in bowtie ladders with various edge truncations. The symmetric bowtie ladder, which comprises two trivial Su-Schrieffer-Heeger (SSH) lattice…
Chiral states around a mass-inverted quantum dot in graphene
Nojoon Myoung
Topologically protected chiral states at a mass-inverted quantum dot in graphene are studied by analyzing both tight-binding and kernal polynomial method calculations. The mass-inv…
Non-orientability induced PT phase transition in Moebius ladder lattices
Jung-Wan Ryu, Nojoon Myoung, Martina Hentschel +1
We study parity-time (PT) phase transitions in the energy spectra of ladder lattices caused by the interplay between non-orientability and non-Hermitian PT symmetry. The energy spe…
Manipulation of Valley Isospins in Strained Graphene for Valleytronics
Nojoon Myoung, Hyungkook Choi, Hee Chul Park
Graphene's outstanding mechanical properties lend to strain engineering, allowing for future valleytronics and nanoelectromechanic applications. In this work, we have found that a…
Emergent localized states at the interface of a twofold -symmetric lattice
Jung-Wan Ryu, Nojoon Myoung, Sungjong Woo +3
We consider the role of non-triviality resulting from a non-Hermitian Hamiltonian that conserves twofold PT-symmetry assembled by interconnections between a PT-symmetric lattice an…
Splitting of conductance resonance through a magnetic quantum dot in graphene
Nojoon Myoung, Jung-Wan Ryu, Hee Chul Park +2
We report a dual resonance feature in ballistic conductance through a quantum Hall graphene nanoribbon with a magnetic quantum dot. Such a magnetic quantum dot localizes Dirac ferm…
Flat-band localization and self-collimation of light in photonic crystals
Nojoon Myoung, Hee Chul Park, Ajith Ramachandran +2
We investigate the optical properties of a photonic crystal composed of a quasi-one-dimensional flat-band lattice array through finite-difference time-domain simulations. The photo…
Antiresonance induced by symmetry-broken contacts in quasi-one-dimensional lattices
Jung-Wan Ryu, Nojoon Myoung, Hee Chul Park
We report the effect of symmetry-broken contacts on quantum transport in quasi-one-dimensional lattices. In contrast to 1D chains, transport in quasi-one-dimensional lattices, whic…
Reconfiguration of quantum states in -symmetric quasi-one dimensional lattices
Jung-Wan Ryu, Nojoon Myoung, Hee Chul Park
We demonstrate mesoscopic transport through quantum states in quasi-1D lattices maintaining the combination of parity and time-reversal symmetries by controlling energy gain and lo…
Conductance oscillations in Chern insulator junctions: valley-isospin dependence and Aharonov-Bohm effects
Nojoon Myoung, Hee Chul Park
The transport properties of Chern insulator junctions generated by bipolar junctions in quantum Hall graphene are theoretically studied in the coherent regime. Coherent transport a…
Gate-Tunable Spin Transport and Giant Electroresistance in Ferromagnetic Graphene Vertical Heterostructures
Nojoon Myoung, Hee Chul Park, Seung Joo Lee
We investigate spin transport through ferromagnetic graphene vertical heterostructures where a sandwiched tunneling layer is either a normal or ferroelectric insulator. We show tha…