Hongki Min
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View article: Photoinduced dc Hall current in few-layer black phosphorus with a gate-tunable Floquet gap
Photoinduced dc Hall current in few-layer black phosphorus with a gate-tunable Floquet gap Open
We theoretically explore Floquet engineering in few-layer black phosphorus (fBP) under time-periodic driving. Motivated by the ability of circularly polarized light to induce nontrivial topological states at Dirac nodes, we investigate the…
View article: Unveiling three types of fermions in a nodal ring topological semimetal through magneto-optical transitions
Unveiling three types of fermions in a nodal ring topological semimetal through magneto-optical transitions Open
We investigate the quasiparticles of a single nodal ring semimetal SrAs$_3$ through axis-resolved magneto-optical measurements. We observe three types of Landau levels scaling as $\varepsilon \sim \sqrt{B}$, $\varepsilon \sim B^{2/3}$, and…
View article: Sub-MeV dark matter detection with bilayer graphene
Sub-MeV dark matter detection with bilayer graphene Open
The light dark matter mass regime has emerged as the next frontier in the direct detection experiment due to the lack of any detection signal in the higher mass range. In this paper, we propose a new detector material, a bilayer stack of g…
View article: Sliding-dependent electronic structures of alternating-twist tetralayer graphene
Sliding-dependent electronic structures of alternating-twist tetralayer graphene Open
We study the electronic structure of alternating-twist tetralayer graphene, especially near its magic angle $θ= 1.75^\circ$, for different AA, AB, and SP sliding geometries at their middle interface that divides two twisted bilayer graphen…
View article: Effect of trivial bands on chiral anomaly-induced longitudinal magnetoconductivity in Weyl semimetals
Effect of trivial bands on chiral anomaly-induced longitudinal magnetoconductivity in Weyl semimetals Open
Including the effect of the trivial band near Weyl nodes, we evaluate the longitudinal magnetoconductivity (LMC) of Weyl semimetals along the magnetic field direction using the Boltzmann magnetotransport theory, and study its dependence on…
View article: Sub-MeV Dark Matter Detection with Bilayer Graphene
Sub-MeV Dark Matter Detection with Bilayer Graphene Open
The light dark matter mass regime has emerged as the next frontier in the direct detection experiment due to the lack of any detection signal in the higher mass range. In this paper, we propose a new detector material, a bilayer stack of g…
View article: Role of Local Conductivities in the Plasmon Reflections at the Edges and Stacking Domain Boundaries of Trilayer Graphene
Role of Local Conductivities in the Plasmon Reflections at the Edges and Stacking Domain Boundaries of Trilayer Graphene Open
We employed infrared scattering-type scanning near-field optical microscopy (IR-sSNOM) to study surface plasmon polaritons (SPPs) in trilayer graphene (TLG). Our study reveals systematic differences in near-field IR spectra and SPP wavelen…
View article: Chirality and correlations in the spontaneous spin-valley polarization of rhombohedral multilayer graphene
Chirality and correlations in the spontaneous spin-valley polarization of rhombohedral multilayer graphene Open
We investigate the total energies of spontaneous spin-valley polarized states in bi-, tri-, and tetralayer rhombohedral graphene where the long-range Coulomb correlations are accounted for within the random phase approximation. Our analysi…
View article: Optical transitions of a single nodal ring in SrAs$_3$: radially and axially resolved characterization
Optical transitions of a single nodal ring in SrAs$_3$: radially and axially resolved characterization Open
SrAs$_3$ is a unique nodal-line semimetal that contains only a single nodal ring in the Brillouin zone, uninterrupted by any trivial bands near the Fermi energy. We performed axis-resolved optical reflection measurements on SrAs$_3$ and ob…
View article: Semiclassical Boltzmann magnetotransport theory in anisotropic systems with a nonvanishing Berry curvature
Semiclassical Boltzmann magnetotransport theory in anisotropic systems with a nonvanishing Berry curvature Open
Understanding the transport behavior of an electronic system under the influence of a magnetic field remains a key subject in condensed matter physics. Particularly in topological materials, their nonvanishing Berry curvature can lead to m…
View article: Electronic structure of biased alternating-twist multilayer graphene
Electronic structure of biased alternating-twist multilayer graphene Open
We theoretically study the energy and optical absorption spectra of alternating twist multilayer graphene (ATMG) under a perpendicular electric field. We obtain analytically the low-energy effective Hamiltonian of ATMG up to pentalayer in …
View article: Nearly flat bands in twisted triple bilayer graphene
Nearly flat bands in twisted triple bilayer graphene Open
We investigate the electronic structure of alternating-twist triple\nBernal-stacked bilayer graphene (t3BG) as a function of interlayer coupling\n$\\omega$, twist angle $\\theta$, interlayer potential difference $\\Delta$, and\ntop-bottom …
View article: Semiclassical magnetotransport including effects of Berry curvature and Lorentz force
Semiclassical magnetotransport including effects of Berry curvature and Lorentz force Open
In topological semimetals and insulators, negative longitudinal\nmagnetoresistance and angle-dependent planar Hall effect have been reported\narising from the Berry curvature. Using the Boltzmann transport theory, we\npresent a closed-form…
View article: Diffusive density response of electrons in anisotropic multiband systems
Diffusive density response of electrons in anisotropic multiband systems Open
We explicitly calculate the density-density response function with conserving vertex corrections for anisotropic multiband systems in the presence of impurities including long-range disorder. The direction-dependence of the vertex correcti…
View article: Topological multiband <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>s</mml:mi></mml:math>-wave superconductivity in coupled multifold fermions
Topological multiband -wave superconductivity in coupled multifold fermions Open
We study three-dimensional time-reversal-invariant topological\nsuperconductivity in noncentrosymmetric materials such as RhSi, CoSi, and AlPt\nwhich host coupled multifold nodes energetically split by the spin-orbit\ncoupling at the same …
View article: Semiclassical Boltzmann magnetotransport theory in anisotropic systems with a nonvanishing Berry curvature
Semiclassical Boltzmann magnetotransport theory in anisotropic systems with a nonvanishing Berry curvature Open
Understanding the transport behavior of an electronic system under the influence of a magnetic field remains a key subject in condensed matter physics. Particularly in topological materials, their nonvanishing Berry curvature can lead to m…
View article: $s_{+}\oplus s_{-}$ Topological Superconductivity in Coupled Multifold Fermions
$s_{+}\oplus s_{-}$ Topological Superconductivity in Coupled Multifold Fermions Open
We study a three-dimensional time-reversal-invariant topological superconductivity in materials with the noncentrosymmetric B20 cubic structure such as RhSi, CoSi, and AlPt which host coupled multifold nodes energetically split by the spin…
View article: Quasi-One-Dimensional Higher-Order Topological Insulators
Quasi-One-Dimensional Higher-Order Topological Insulators Open
Quasi-1D materials Bi$_{4}$X$_{4}$ (X=Br,I) are prototype weak topological insulators (TI) in the $β$ phase. For the $α$ phases, recent high-throughput database screening suggests that Bi$_{4}$Br$_{4}$ is a rare higher-order TI (HOTI) wher…
View article: Optically Controlled Orbitronics on a Triangular Lattice
Optically Controlled Orbitronics on a Triangular Lattice Open
The propagation of electrons in an orbital multiplet dispersing on a lattice can support anomalous transport phenomena deriving from an orbitally induced Berry curvature. In striking contrast to the related situation in graphene, we find t…
View article: Emergent Anisotropic Non-Fermi Liquid at a Topological Phase Transition in Three Dimensions
Emergent Anisotropic Non-Fermi Liquid at a Topological Phase Transition in Three Dimensions Open
Understanding correlation effects in topological phases and their transitions is a cutting-edge area of research in recent condensed matter physics. We study topological quantum phase transitions (TQPTs) between double-Weyl semimetals (DWS…
View article: Vertex corrections to the dc conductivity in anisotropic multiband systems
Vertex corrections to the dc conductivity in anisotropic multiband systems Open
For an isotropic single-band system, it is well known that the semiclassical\nBoltzmann transport theory within the relaxation time approximation and the\nKubo formula with the vertex corrections provide the same result with the\n$(1-\\cos…
View article: Emergent Anisotropic Non-Fermi Liquid
Emergent Anisotropic Non-Fermi Liquid Open
Understanding correlation effects in topological phases and their transitions is a cutting-edge area of research in recent condensed matter physics. We study topological quantum phase transitions (TQPTs) between double-Weyl semimetals (DWS…
View article: Optically-Controlled Orbitronics on a Triangular Lattice
Optically-Controlled Orbitronics on a Triangular Lattice Open
The propagation of electrons in an orbital multiplet dispersing on a lattice can support anomalous transport phenomena deriving from an orbitally-induced Berry curvature. In striking contrast to the related situation in graphene, we find t…
View article: Diluted magnetic Dirac-Weyl materials: Susceptibility and ferromagnetism in three-dimensional chiral gapless semimetals
Diluted magnetic Dirac-Weyl materials: Susceptibility and ferromagnetism in three-dimensional chiral gapless semimetals Open
We theoretically investigate the temperature-dependent static susceptibility and long-range magnetic coupling of three-dimensional (3D) chiral gapless electron-hole systems (semimetals) with arbitrary band dispersion [i.e., $\varepsilon(k)…
View article: Phase Transitions of the Polariton Condensate in 2D Dirac Materials
Phase Transitions of the Polariton Condensate in 2D Dirac Materials Open
For the quantum well in an optical microcavity, the interplay of the Coulomb interaction and the electron-photon (e-ph) coupling can lead to the hybridizations of the exciton and the cavity photon known as polaritons, which can form the Bo…
View article: Electrodynamics on Fermi Cyclides in Nodal Line Semimetals
Electrodynamics on Fermi Cyclides in Nodal Line Semimetals Open
We study the frequency-dependent conductivity of nodal line semimetals (NLSMs), focusing on the effects of carrier density and energy dispersion on the nodal line. We find that the low-frequency conductivity has a rich spectral structure w…
View article: Erratum: Collective modes in multi-Weyl semimetals
Erratum: Collective modes in multi-Weyl semimetals Open
Scientific Reports 6: Article number: 34023; published online: 30 September 2016; updated: 21 June 2017. This Article contains typographical errors, where all instances of \bm k should read k .
View article: Semiclassical Boltzmann transport theory for multi-Weyl semimetals
Semiclassical Boltzmann transport theory for multi-Weyl semimetals Open
Multi-Weyl semimetals (m-WSMs) are a new type of Weyl semimetal that have linear dispersion along one symmetry direction but anisotropic nonlinear dispersion along the two transverse directions with a topological charge larger than one. Us…
View article: Optical conductivity of multi-Weyl semimetals
Optical conductivity of multi-Weyl semimetals Open
Multi-Weyl semimetals are new types of Weyl semimetals which have anisotropic nonlinear energy dispersion and a topological charge larger than one, thus exhibiting a unique quantum response. Using a unified lattice model, we calculate the …
View article: Ferromagnetism in chiral multilayer two-dimensional semimetals
Ferromagnetism in chiral multilayer two-dimensional semimetals Open
We calculate the temperature dependent long-range magnetic coupling in the\npresence of dilute concentrations of random magnetic impurities in chiral\nmultilayer two-dimensional semimetals, i.e., undoped intrinsic multilayer\ngraphene. Ass…