G-H. Kim | Searcharxiv

arXiv2024

New Beam Dynamics Code for Cyclotron Analysis

This paper describes the beam dynamic simulation with transfer matrix method for cyclotron. Starting from a description on the equation of motion in the cyclotron, lattice functions were determined from transfer matrix method and the solutions for the 2nd-order nonlinear Hamiltonian were introduced and used in phase space particle tracking. Based on the description of beam dynamics in the cyclotron, simulation code was also developed for cyclotron design.

physics.acc-ph↗

arXiv2021

Signature of spin-resolved quantum point contact in p-type trilayer WSe$_{2}$ van der Waals heterostructure

In this study, the electrostatically induced quantum confinement structure, quantum point contact, has been realized in p-type trilayer tungsten diselenide-based van der Waals heterostructure with modified van der Waals contact method with degenerately doped transition metal dichalcogenide crystals. Clear quantized conductance and pinch-off state through the one-dimensional confinement were observed by dual-gating of split gate electrodes and top gate. Conductance plateaus were observed at step of 0.5 $\times$ 2e$^{2}$/h at zero and high magnetic field in addition to quarter plateaus at a finite bias voltage condition indicating the signature of spin-polarized quantum point contact realization.

cond-mat.mes-hall↗