Quantum mechanical complementarity probed in a closed-loop Aharonov-Bohm interferometer (2008)
Chang, Dong-In, Khym, Gyong Luck, Kang, Kicheon, Chung, Yunchul, Lee, Hu-Jong, Seo, Minky, ...
According to Bohr's complementarity principle, a particle possesses wave-like properties only when the different paths the particle may take are indistinguishable. In a canonical example of a...
Beating of Aharonov-Bohm oscillations in a closed-loop interferometer (2008)
Jo, Sanghyun, Khym, Gyong Luck, Chang, Dong-In, Chung, Yunchul, Lee, Hu-Jong, Kang, Kicheon, ...
One of the points at issue with closed-loop-type interferometers is beating in the Aharonov-Bohm (AB) oscillations. Recent observations suggest the possibility that the beating results from the...
Edge-state Fabry-Perot interferometer as a high sensitivity charge detector (2008)
We present a scheme for high sensitivity charge detection in the integer quantum Hall regime using two point contacts in a series. The setup is an electronic analog of an optical Fabry-Perot...
Conditional relaxation of a charge state under continuous weak measurement (2008)
Khym, Gyong Luck, Kang, Kicheon
We investigate the conditional evolution of a charge state coupled to a mesoscopic detector under continuous weak measurement. The state suffers relaxation into a particular state with a definite...
Lee, Youngnae, Khym, Gyong Luck, Kang, Kicheon
We investigate the charge-detection-induced dephasing of a charge qubit interacting with an electronic beam collider composed of a quantum point contact. We report that, while the qubit is dephased...
Kang, Kicheon, Khym, Gyong Luck
We investigate various aspects of the Kondo singlet in a quantum dot (QD) electrostatically coupled to a mesoscopic detector. The two subsystems are represented by an entangled state between the...
Violation of Bell's inequality in electronic Mach-Zehnder interferometers (2007)
We propose a possible setup of testing the Bell's inequality in mesoscopic conductors. The particular implementation uses two coupled electronic Mach-Zehnder interferometers in which electrons are...
We investigate magnetic-field asymmetries in the linear transport of a mesoscopic conductor interacting with its environment. Interestingly, we find that the interaction between the two systems...
Fano Effect in a Few-Electron Quantum Dot (2007)
Otsuka, Tomohiro, Abe, Eisuke, Katsumoto, Shingo, Iye, Yasuhiro, Khym, Gyong Luck, Kang, Kicheon
We have studied the Fano effect in a few-electron quantum dot side-coupled to a quantum wire. The conductance of the wire, which shows an ordinal staircase-like quantization without the dot, is...
An Electronic Mach-Zehnder Quantum Eraser (2006)
We propose an electronic quantum eraser in which the electrons are injected into a mesoscopic conductor at the quantum Hall regime. The conductor is composed of a two-path interferometer which is an...
Charge Detection in a Closed-Loop Aharonov-Bohm Interferometer (2006)
Khym, Gyong Luck, Kang, Kicheon
We report on a study of complementarity in a two-terminal "closed-loop" Aharonov-Bohm interferometer. In this interferometer, the simple picture of two-path interference cannot be applied. We...
Dephasing and Measurement Efficiency via a Quantum Dot Detector (2006)
Khym, Gyong Luck, Lee, Youngnae, Kang, Kicheon
We study charge detection and controlled dephasing of a mesoscopic system via a quantum dot detector (QDD), where the mesoscopic system and the QDD are capacitively coupled. The QDD is considered to...
Decoherence of the Kondo Singlet via a Quantum Point Contact Detector (2005)
We investigate the effect of the charge state measurement of the Kondo singlet for a quantum dot transistor via a capacitively coupled quantum point contact detector. By employing the variational...
Charge State Measurement and Persistent Current in a Double-Dot Aharonov Bohm Ring (2005)
Khym, Gyong Luck, Cho, Sam Young, Kang, Kicheon
This paper has been withdrawn by the authors due to a crucial error.
Comment on "Josephson Current through a Nanoscale Magnetic Quantum Dot" (2005)
Choi, Mahn-Soo, Lee, Minchul, Kang, Kicheon, Belzig, Wolfgang
Anomalous Transmission Phase of a Kondo-Correlated Quantum Dot (2004)
We study phase evolution of transmission through a quantum dot with Kondo correlations. By considering a model that includes nonresonant transmission as well as the Anderson impurity, we explain...
Kondo effect and Josephson current through a quantum dot between two superconductors (2004)
Choi, Mahn-Soo, Lee, Minchul, Kang, Kicheon, Belzig, Wolfgang
We investigate the supercurrent through a quantum dot for the whole range of couplings using the numerical renormalization group method. We find that the Josephson current switches abruptly from a p-...
Kondo Effect and Josephson Current through a Quantum Dot between Two Superconductors (2003)
Choi, Mahn-Soo, Lee, Minchul, Kang, Kicheon, Belzig, W.
We investigate the supercurrent through a quantum dot for the whole range of couplings using the numerical renormalization group method. We find that the Josephson current switches abruptly from a...
Fano resonance in crossed carbon nanotubes (2003)
Kim, Jinhee, Kim, Jae-Ryoung, Lee, Jeong-O, Park, Jong Wan, So, Hye Mi, Kim, Nam, ...
We report the observation of the resonant transport in multiwall carbon nanotubes in a crossed geometry. The resonant transport is manifested by an asymmetric peak in the differential conductance...
We investigate resonant tunneling through molecular states of coupled double quantum dots embedded in an Aharonov-Bohm (AB) interferometer. The conductance through the system consists of two...
Magnetic Polarization Currents in Double Quantum Dot Devices (2002)
Cho, Sam Young, McKenzie, Ross H., Kang, Kicheon, Kim, Chul Koo
We investigate coherent electron transport through a parallel circuit of two quantum dots, each of which has a single tunable energy level. Electrons tunneling via each dot from the left lead...
Spin Fluctuation Induced Dephasing in a Mesoscopic Ring (2002)
Kang, Kicheon, Cho, Sam Young, Park, Kyoung Wan
We investigate the persistent current in a hybrid Aharonov-Bohm ring - quantum dot system coupled to a reservoir which provides spin fluctuations. It is shown that the spin exchange interaction...
Effect of Charge Fluctuations on the Persistent Current through a Quantum Dot (2001)
Kang, Kicheon, Cho, Sam Young, Kim, Ju-Jin
We study coherent charge transfer between an Aharonov-Bohm ring and a side-attached quantum dot. The charge fluctuation between the two sub-structures is shown to give rise to algebraic suppression...
Phase-dependent Kondo Resonance in a Quantum Dot Connected to a Mesoscopic Ring (2001)
Phase-sensitive transport through a quantum dot coupled to an Aharonov-Bohm ring is analyzed. In this geometry the spectral density of states is directly related to the conductance. It is shown that...
Anti-Kondo resonance in transport through a quantum wire with a side-coupled quantum dot (2001)
Kang, Kicheon, Cho, Sam-Young, Shin, Sung-Chul
An interacting quantum dot side-coupled to a perfect quantum wire is studied. Transport through the quantum wire is investigated by using an exact sum rule and the slave-boson mean field treatment....
Mesoscopic Kondo Effect in an Aharonov-Bohm Ring (2000)
Kang, Kicheon, Shin, Sung-Chul
An interacting quantum dot inserted in a mesoscopic ring is investigated. A variational ansatz is employed to describe the ground state of the system in the presence of the Aharonov-Bohm flux. It is...
Spin Fluctuation and Persistent Current in a Mesoscopic Ring Coupled to a Quantum Dot (2000)
Cho, Sam Young, Kang, Kicheon, Kim, Chul Koo, Ryu, Chang-Mo
We investigate the persistent current influenced by the spin fluctuations in a mesoscopic ring weakly coupled to a quantum dot. It is shown that the Kondo effect gives rise to some unusual features...
Anti-Kondo resonance in transport through a quantum wire with a side-coupled quantum dot (2000)
Kang, Kicheon, Cho, Sam Young, Kim, Ju-Jin, Shin, Sung-Chul
An interacting quantum dot side-coupled to a perfect quantum wire is studied. Transport through the quantum wire is investigated by using an exact sum rule and the slave-boson mean field treatment....
Parity Effect in a mesoscopic superconducting ring (2000)
We study a mesoscopic superconducting ring threaded by a magnetic flux when the single particle level spacing is not negligible. It is shown that, for a superconducting ring with even parity, the...
Kim, Jinhee, Kang, Kicheon, Lee, Jeong-O, Yoo, Kyung-Hwa, Kim, Jae-Ryoung, Park, Jong Wan, ...
Luttinger liquid behavior was observed in a crossed junction formed with two metallic multi-wall carbon nanotubes whose differential conductance vanished with the power of bias voltage and...
Cho, Sam Young, Kang, Kicheon, Ryu, Chang-Mo
Resonant tunneling through a quantum dot coupled to superconducting reservoirs in the presence of time-dependent external voltage has been studied. A general formula of the current is derived based...
Mesoscopic Kondo Effect in an Aharonov-Bohm Ring (1999)
Kang, Kicheon, Shin, Sung-Chul
An interacting quantum dot inserted in a mesoscopic ring is investigated. A variational ansatz is employed to describe the ground state of the system in the presence of the Aharonov-Bohm flux. It is...
Coherent Transport through a Quantum Dot Embedded in an Aharonov-Bohm Ring (1998)
We study the coherent transport in multi-terminal mesoscopic Aharonov-Bohm ring with a quantum dot embedded in an arm. Employing the Friedel sum rule for the effective single-particle levels in the...
A new perturbation treatment applied to the transport through a quantum dot (1998)
Resonant tunnelling through an Anderson impurity is investigated by employing a new perturbation scheme at nonequilibrium. This new approach gives the correct weak and strong coupling limit in $U$ by...
Kondo-resonance, Coulomb blockade, and Andreev transport through a quantum dot (1998)
We study resonant tunneling through an interacting quantum dot coupled to normal metallic and superconducting leads. We show that large Coulomb interaction gives rise to novel effects in Andreev...
Transport through an Interacting Quantum Dot Coupled to Two Superconducting Leads (1998)
We derive a formula for the current through an interacting quantum dot coupled to two supercouducting leads, using the non-equilibrium Green's function formalism. It is shown that the formula takes...
Linear Chain of Coupled Quantum Dots (1997)
Kang, Kicheon, Cha, Min-Chul, Yang, S. -R. Eric
A linearly coupled chain of spin-polarized quantum dots is investigated under the condition that the number of electrons is equal to or less than the number of the dots. The chemical potential of the...
Effect of Quantum Confinement on Electron Tunneling through a Quantum Dot (1997)
Employing the Anderson impurity model, we study tunneling properties through an ideal quantum dot near the conductance minima. Considering the Coulomb blockade and the quantum confinement on an equal...
The Finite-$U$ Impurity Anderson Model in the presence of an external magnetic field (1996)
We have investigated effects of an external magnetic field in the impurity Anderson model with a finite on-site Coulomb repulsion $U$. Large $N_f$ expansion is employed in the slave boson...