114 citations · 783 across the 24 of their papers we have counts for
21 papers · 1 filter
Ultrafast energy relaxation of quantum dot-generated 2D hot electrons
Dongsung T. Park, Dongkun Kim, Uhjin Kim +8
Through a series of transverse magnetic focusing experiments, we show that hot electrons in a two-dimensional electron gas system undergo an ultrafast relaxation when generated by…
Negative Excess Shot Noise by Anyon Braiding
Byeongmok Lee, Cheolhee Han, H. -S. Sim
Anyonic fractional charges have been detected by autocorrelation shot noise at a quantum point contact (QPC) between two fractional quantum Hall edges. We find that the autoc…
Non-Abelian Evolution of a Majorana Train in a Single Josephson Junction
Sang-Jun Choi, H. -S. Sim
Demonstration of non-Abelian anyon statistics often requires dynamical controls of a complicated device that are challenging in realistic situations. We propose a {\it single} Jose…
Topological vacuum bubble by anyon braiding
Cheolhee Han, Jinhong Park, Yuval Gefen +1
According to a basic rule of fermionic and bosonic many-body physics, known as the linked cluster theorem, physical observables are not affected by vacuum bubbles, which represent…
Phonon emission and arrival times of electrons from a single-electron source
C. Emary, A. Dyson, Sungguen Ryu +2
In recent charge-pump experiments, single electrons are injected into quantum Hall edge channels at energies significantly above the Fermi level. We consider here the relaxation of…
Topological dephasing in the fractional Quantum Hall Regime
Jinhong Park, Yuval Gefen, H. -S. Sim
We study dephasing in electron transport through a large quantum dot (a Fabry-Perot interferometer) in the fractional quantum Hall regime with filling factor . In the regime o…
Charge frustration in a triangular triple quantum dot
M. Seo, H. K. Choi, S. -Y. Lee +5
We experimentally investigate the charge (isospin) frustration induced by a geometrical symmetry in a triangular triple quantum dot. We observe the ground-state charge configuratio…
Geometric phase at graphene edge
Sang-Jun Choi, Sunghun Park, H. -S. Sim
We study the scattering phase shift of Dirac fermions at graphene edge. We find that when a plane wave of a Dirac fermion is reflected at an edge of graphene, its reflection phase…
Absence of Aharonov-Bohm effect of chiral Majorana fermion edge states
Sunghun Park, Joel E. Moore, H. -S. Sim
Majorana fermions in a superconductor hybrid system are charge neutral zero-energy states. For the detection of this unique feature, we propose an interferometry of a chiral Majora…
Detecting Perfect Transmission in Josephson Junctions on the Surface of Three Dimensional Topological Insulators
Roni Ilan, Jens H. Bardarson, H. -S. Sim +1
We consider Josephson junctions on surfaces of three dimensional topological insulator nanowires. We find that in the presence of a parallel magnetic field, short junctions on nano…
Visibility recovery by strong interaction in an electronic Mach-Zehnder interferometer
Soo-Yong Lee, Hyun-Woo Lee, H. -S. Sim
We study the evolution of a single-electron packet of Lorentzian shape along an edge of the integer quantum Hall regime or in a Mach-Zehnder interferometer, considering a capacitiv…
Local and Tunable Geometric Phase of Dirac Fermions in a Topological Junction
Sang-Jun Choi, Sunghun Park, H. -S. Sim
We discover a new type of geometric phase of Dirac fermions in solids, which is an electronic analogue of the Pancharatnam phase of polarized light. The geometric phase occurs in a…
Stabilization of single-electron pumps by high magnetic fields
J. D. Fletcher, M. Kataoka, S. P. Giblin +8
We study the effect of perpendicular magnetic fields on a single-electron system with a strongly time-dependent electrostatic potential. Continuous improvements to the current quan…
Klein Tunneling and Berry Phase in Bilayer Graphene with a Band Gap
Sunghun Park, H. -S. Sim
Klein tunneling in gapless bilayer graphene, perfect reflection of electrons injecting normal to a pn junction, is expected to disappear in the presence of energy band gap induced…
Capacitive interaction model for Aharonov-Bohm effects of a quantum Hall antidot
W. -R. Lee, H. -S. Sim
We derive a general capacitive interaction model for an antidot-based interferometer in the integer quantum Hall regime, and study Aharonov-Bohm resonances in a single antidot with…
Spectator Behavior in a Quantum Hall Antidot with Multiple Bound Modes
W. -R. Lee, H. -S. Sim
We theoretically study Aharonov-Bohm resonances in an antidot system with multiple bound modes in the integer quantum Hall regime, taking capacitive interactions between the modes…
Bilayer Graphene Interferometry : Phase Jump and Wave Collimation
Sunghun Park, H. -S. Sim
We theoretically study the phase of the reflection amplitude of an electron (massive Dirac fermion) at a lateral potential step in Bernal-stacked bilayer graphene. The phase shows…
Electron interactions in an antidot in the integer quantum Hall regime
H. -S. Sim, M. Kataoka, C. J. B. Ford
A quantum antidot, a submicron depletion region in a two-dimensional electron system, has been actively studied in the past two decades, providing a powerful tool for understanding…
Electron Pair Resonance in the Coulomb Blockade
Eran Sela, H. S. Sim, Yuval Oreg +2
We study many-body corrections to the cotunneling current via a localized state with energy at large bias voltages . We show that the transfer of {\em electron pairs}, ena…
Towards unified understanding of conductance of stretched monatomic contacts
H. -W. Lee, H. -S. Sim, D. -H. Kim +1
When monatomic contacts are stretched, their conductance behaves in qualitatively different ways depending on their constituent atomic elements. Under a single assumption of resona…
Even-odd behavior of conductance in monatomic sodium wires
H. -S. Sim, H. -W. Lee, K. J. Chang
With the aid of the Friedel sum rule, we perform first-principles calculations of conductances through monatomic Na wires, taking into account the sharp tip geometry and discrete a…