107 citations · 579 across the 25 of their papers we have counts for
25 papers
Simulating the Dicke Model on Qubit-Based and hybrid Qubit-Boson-Based Quantum Computers
Aravind P. Babu, Seongjin Ahn, Jing Sun +3
The Dicke model provides a fundamental description of collective light-matter interactions and has long served as a testbed for exploring a wide range of physical phenomena in quan…
Qubit entanglement generated by classical light driving an optical cavity
Seongjin Ahn, Andrey S. Moskalenko, Vladimir Y. Chernyak +1
We study the generation of entanglement between two qubits which communicate through a single cavity mode of quantum light but have no direct interaction. We show that such entangl…
Density-tuned effective metal-insulator transitions in 2D semiconductor layers: Anderson localization or Wigner crystallization
Seongjin Ahn, Sankar Das Sarma
Electrons (or holes) confined in 2D semiconductor layers have served as model systems for studying disorder and interaction effects for almost 50 years. In particular, strong disor…
Hydrodynamics, viscous electron fluid, and Wiedeman-Franz law in 2D semiconductors
Seongjin Ahn, Sankar Das Sarma
Considering theoretically the transition between hydrodynamic and ballistic regimes in 2D semiconductors, we show that electrons in high-mobility 2D GaAs are by far the best system…
Anderson localization crossover in 2D Si systems: The past and the present
Seongjin Ahn, Sankar Das Sarma
Using Ioffe-Regel-Mott (IRM) criterion for strong localization crossover in disordered doped 2D electron systems, we theoretically study the relationships among the three key exper…
Temperature dependent resistivity in the doped two dimensional metallic phase of mTMD bilayers
Seongjin Ahn, Sankar Das Sarma
Two recent experiments from Cornell and Columbia have reported insulator-to-metal transitions in two-dimensional (2D) moiré transition metal dichalcogenides (mTMD) induced by dopin…
Planckian properties of 2D semiconductor systems
Seongjin Ahn, Sankar Das Sarma
We describe and discuss the low-temperature resistivity (and the temperature-dependent inelastic scattering rate) of several different doped 2D semiconductor systems from the persp…
Density-dependent two-dimensional optimal mobility in ultra-high-quality semiconductor quantum wells
Seongjin Ahn, Sankar Das Sarma
We calculate using the Boltzmann transport theory the density dependent mobility of two-dimensional (2D) electrons in GaAs, SiGe and AlAs quantum wells as well as of 2D holes in Ga…
Valley polarization transition in a two-dimensional electron gas
Seongjin Ahn, Sankar Das Sarma
We theoretically study transport signatures associated with a spontaneous 2-valley to 1-valley quantum phase transition in a two-dimensional electron gas (2DEG) tuned by decreasing…
Estimating disorder and its adverse effects in semiconductor Majorana nanowires
Seongjin Ahn, Haining Pan, Benjamin Woods +2
We use the available transport measurements in the literature to develop a dataset for the likely amount of disorder in semiconductor (InAs and InSb) materials which are used in fa…
Disorder induced 2D metal-insulator transition in moiré transition metal dichalcogenide multilayers
Seongjin Ahn, Sankar Das Sarma
We develop a minimal theory for the recently observed metal-insulator transition (MIT) in two-dimensional (2D) moiré multilayer transition metal dichalcogenides (mTMD) using Coulom…
Fragile versus stable two-dimensional fermionic quasiparticles
Seongjin Ahn, Sankar Das Sarma
We provide a comprehensive theoretical investigation of the Fermi liquid quasiparticle description in two-dimensional electron gas interacting via the long-range Coulomb interactio…
Dips in high-order harmonics spectra from a subcycle-driven two-level system reflected in the negativity structure of the time-frequency Wigner function
Seongjin Ahn, Andrey S. Moskalenko
We investigate high-order harmonics spectra radiated from a two-level model system driven by strong, ultrabroadband half- and single-cycle pulses, which are shorter than the invers…
Screening, Friedel oscillations, RKKY interaction, and Drude transport in anisotropic two-dimensional systems
Seongjin Ahn, S. Das Sarma
We investigate the effect of the mass anisotropy on Friedel Oscillations, Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, screening properties, and Boltzmann transport in two dim…
Anisotropic Fermionic Quasiparticles
Seongjin Ahn, S. Das Sarma
We have carried out a comprehensive investigation of the quasiparticle properties of a two-dimensional electron gas, interacting via the long-range Coulomb interaction, in the pres…
Theroy of anisotropic plasmons
Seongjin Ahn, S. Das Sarma
We develop the complete theory for the collective plasmon modes of an interacting electron system in the presence of explicit mass (or velocity) anisotropy in the corresponding non…
Microscopic bath effects on noise spectra in semiconductor quantum dot qubits
Seongjin Ahn, S. Das Sarma, J. P. Kestner
When a system is thermally coupled to only a small part of a larger bath, statistical fluctuations of the temperature (more precisely, the internal energy) of this "sub-bath" aroun…
Fermi-surface topology and renormalization of bare ellipticity in an interacting anisotropic electron gas
Seongjin Ahn, Sankar Das Sarma
We investigate effects of electron-electron interactions on the shape of the Fermi surface in an anisotropic two-dimensional electron gas using the `RPA-GW' self-energy approximati…
Optical conductivity of black phosphorus with a tunable electronic structure
Jiho Jang, Seongjin Ahn, Hongki Min
Black phosphorus (BP) is a two-dimensional layered material composed of phosphorus atoms. Recently, it was demonstrated that external perturbations such as an electric field close…
Optically-Controlled Orbitronics on a Triangular Lattice
Vo Tien Phong, Zachariah Addison, Seongjin Ahn +3
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 striki…
Type-II Dirac line node in strained Na3N
Dongwook Kim, Seongjin Ahn, Jong Hyun Jung +4
Dirac line node (DLN) semimetals are a class of topological semimetals that feature band-crossing lines in momentum space. We study the type-I and type-II classification of DLN sem…
Electrodynamics on Fermi Cyclides in Nodal Line Semimetals
Seongjin Ahn, E. J. Mele, Hongki Min
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…
Optical conductivity of multi-Weyl semimetals
Seongjin Ahn, E. J. Mele, Hongki Min
Multi-Weyl semimetals are new types of Weyl semimetals which have anisotropic non-linear energy dispersion and a topological charge larger than one, thus exhibiting a unique quantu…
Collective modes in multi-Weyl semimetals
Seongjin Ahn, E. H. Hwang, Hongki Min
We investigate collective modes in three dimensional (3D) gapless multi-Weyl semimetals with anisotropic energy band dispersions (i.e., ,…