796 citations · 3.3k across the 42 of their papers we have counts for
20 papers · 1 filter
Orbitally controlled quantum Hall states in decoupled two-bilayer graphene sheets
Soyun Kim, Dohun Kim, Kenji Watanabe +3
We report on integer and fractional quantum Hall states in a stack of two twisted Bernal bilayer graphene sheets. By exploiting the momentum mismatch in reciprocal space, we suppre…
Observation of Electronic Modes in Open Cavity Resonator
Hwanchul Jung, Dongsung T. Park, Seokyeong Lee +9
The resemblance between electrons and optical waves has strongly driven the advancement of mesoscopic physics. However, electron waves have yet to be understood in open cavity stru…
Robust Interlayer-Coherent Quantum Hall States in Twisted Bilayer Graphene
Dohun Kim, Byungmin Kang, Yong-Bin Choi +5
We introduce a novel two-dimensional electronic system with ultrastrong interlayer interactions, namely twisted bilayer graphene with a large twist angle, as an ideal ground for re…
Wigner-molecularization-enabled dynamic nuclear field programming
Wonjin Jang, Jehyun Kim, Jaemin Park +8
Multielectron semiconductor quantum dots (QDs) provide a novel platform to study the role of Coulomb correlations in finite quantum systems and their impact on many-body energy spe…
Three individual two-axis control of singlet-triplet qubits in a micromagnet integrated quantum dot array
Wonjin Jang, Min-Kyun Cho, Jehyun Kim +3
We report individual confinement and two-axis qubit operations of two electron spin qubits in GaAs gate-defined sextuple quantum dot array with integrated micro-magnet. As a first…
Fast raster scan multiplexed charge stability measurements toward high-throughput quantum dot array calibration
Wonjin Jang, Min-Kyun Cho, Myungwon Lee +6
We report raster scan multiplexed charge-stability diagram measurements for tuning multiple gate-defined quantum dots in GaAs/AlGaAs heterostructures. We evaluate the charge sensit…
Attractive Coulomb interactions in a triple quantum dot
Changki Hong, Gwangsu Yoo, Jinhong Park +7
Electron pairing due to a repulsive Coulomb interaction in a triple quantum dot (TQD) is experimentally studied. It is found that electron pairing in two dots of a TQD is mediated…
Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit
J. C. Abadillo-Uriel, Brandur Thorgrimsson, Dohun Kim +11
We report anomalous behavior in the energy dispersion of a three-electron double-quantum-dot hybrid qubit and argue that it is caused by atomic-scale disorder at the quantum-well i…
Effects of charge noise on a pulse-gated singlet-triplet qubit
Zhenyi Qi, X. Wu, D. R. Ward +11
We study the dynamics of a pulse-gated semiconductor double quantum dot qubit. In our experiments, the qubit coherence times are relatively long, but the visibility of the quantum…
Extending the coherence of a quantum dot hybrid qubit
Brandur Thorgrimsson, Dohun Kim, Yuan-Chi Yang +10
Identifying and ameliorating dominant sources of decoherence are important steps in understanding and improving quantum systems. Here we show that the free induction decay time ($T…
State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot
D. R. Ward, Dohun Kim, D. E. Savage +5
Universal quantum computation requires high fidelity single qubit rotations and controlled two qubit gates. Along with high fidelity single qubit gates, strong efforts have been ma…
Ambipolar Surface State Thermoelectric Power of Topological Insulator Bi2Se3
Dohun Kim, Paul Syers, Nicholas P. Butch +2
We measure gate-tuned thermoelectric power of mechanically exfoliated Bi2Se3 thin films in the topological insulator regime. The sign of the thermoelectric power changes across the…
High fidelity resonant gating of a silicon based quantum dot hybrid qubit
Dohun Kim, D. R. Ward, C. B. Simmons +5
Isolated spins in semiconductors provide a promising platform to explore quantum mechanical coherence and develop engineered quantum systems. Silicon has attracted great interest a…
Microwave-driven coherent operations of a semiconductor quantum dot charge qubit
Dohun Kim, D. R. Ward, C. B. Simmons +8
A most intuitive realization of a qubit is a single electron charge sitting at two well-defined positions, such as the left and right sides of a double quantum dot. This qubit is n…
Two-axis control of a singlet-triplet qubit with an integrated micromagnet
Xian Wu, D. R. Ward, J. R. Prance +9
The qubit is the fundamental building block of a quantum computer. We fabricate a qubit in a silicon double quantum dot with an integrated micromagnet in which the qubit basis stat…
Quantum control and process tomography of a semiconductor quantum dot hybrid qubit
Dohun Kim, Zhan Shi, C. B. Simmons +9
The similarities between gated quantum dots and the transistors in modern microelectronics - in fabrication methods, physical structure, and voltage scales for manipulation - have…
High Mobility Ambipolar MoS2 Field-Effect Transistors: Substrate and Dielectric Effects
Wenzhong Bao, Xinghan Cai, Dohun Kim +2
We fabricate MoS2 field effect transistors on both SiO2 and polymethyl methacrylate (PMMA) dielectrics and measure charge carrier mobility in a four-probe configuration. For multil…
Coherent Topological Transport on the Surface of Bi2Se3
Dohun Kim, Paul Syers, Nicholas P. Butch +2
The two-dimensional (2D) surface state of the three-dimensional strong topological insulator (STI) is fundamentally distinct from other 2D electron systems in that the Fermi arc en…
Topological insulator quantum dot with tunable barriers
Sungjae Cho, Dohun Kim, Paul Syers +3
Thin (6-7 quintuple layer) topological insulator Bi2Se3 quantum dot devices are demonstrated using ultrathin (2~4 quintuple layer) Bi2Se3 regions to realize semiconducting barriers…
Surface conduction of topological Dirac electrons in bulk insulating Bi2Se3
Dohun Kim, Sungjae Cho, Nicholas P. Butch +5
The newly-discovered three-dimensional strong topological insulators (STIs) exhibit topologically-protected Dirac surface states. While the STI surface state has been studied spect…