253 citations · 665 across the 17 of their papers we have counts for
17 papers
An optimal superconducting hybrid machine
Rosa Lopez, Jong Soo Lim, Kun Woo Kim
Optimal engine performances are accomplished by quantum effects. Here we explore two routes towards ideal engines, namely (1) quantum systems that operate as hybrid machines being…
Floquet simulators for topological surface states in isolation
Kun Woo Kim, Dmitry Bagrets, Tobias Micklitz +1
We propose dynamical protocols allowing for the engineered realization of topological surface states in isolation. Our approach builds on the concept of synthetic dimensions genera…
Probing the topological Anderson transition with quantum walks
Dmitry Bagrets, Kun Woo Kim, Sonja Barkhofen +5
We consider one-dimensional quantum walks in optical linear networks with synthetically introduced disorder and tunable system parameters allowing for the engineered realization of…
Anomalous transport in a topological Wannier-Stark ladder
Kun Woo Kim, Alexei Andreanov, Sergej Flach
A dc (e.g. electric) field with commensurate lattice direction turns a single particle band structure in dimensions into an infinite set of equally spaced irreducible $(d-1)=…
Quantum Hall criticality in Floquet topological insulators
Kun Woo Kim, Dmitry Bagrets, Tobias Micklitz +1
The anomalous Floquet Anderson insulator (AFAI) is a two dimensional periodically driven system in which static disorder stabilizes two topologically distinct phases in the thermod…
Nanomechanical characterization of quantum interference in a topological insulator nanowire
Minjin Kim, Jihwan Kim, Yasen Hou +5
The discovery of two-dimensional gapless Dirac fermions in graphene and topological insulators (TI) has sparked extensive ongoing research toward applications of their unique elect…
Origin of High-Temperature Superconductivity in Compressed LaH
Liangliang Liu, Chongze Wang, Seho Yi +3
Room-temperature superconductivity has been one of the most challenging subjects in modern physics. Recent experiments reported that lanthanum hydride LaH (1) ra…
Floquet Topological Semimetal with Nodal Helix
Kun Woo Kim, Hyun Woong Kwon, Kwon Park
Topological semimetals with nodal line are a novel class of topological matter extending the concept of topological matter beyond topological insulators and Weyl/Dirac semimetals.…
Experimental realization of on-chip topological nanoelectromechanical metamaterials
Jinwoong Cha, Kun Woo Kim, Chiara Daraio
Topological mechanical metamaterials translate condensed matter phenomena, like non-reciprocity and robustness to defects, into classical platforms. At small scales, topological na…
Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems
Keita Hamamoto, Motohiko Ezawa, Kun Woo Kim +2
Spin current plays a central role in spintronics. In particular, finding more efficient ways to generate spin current has been an important issue and studied actively. For example,…
Quantum Phase Transition and Entanglement in Topological Quantum Wires
Jaeyoon Cho, Kun Woo Kim
We investigate the quantum phase transition of the Su-Schrieffer-Heeger (SSH) model by inspecting the two-site entanglements in the ground state. It is shown that the topological p…
Weyl nodes as topological defects of the Wannier-Stark ladder: From surface to bulk Fermi arcs
Kun Woo Kim, Woo-Ram Lee, Yong Baek Kim +1
A hallmark of Weyl semimetal is the existence of surface Fermi arcs connecting two surface-projected Weyl nodes with opposite chiralities. An intriguing question is what determines…
Shift charge and spin photocurrents in Dirac surface states of topological insulator
Kun Woo Kim, Takahiro Morimoto, Naoto Nagaosa
The generation of photocurrent in condensed matter is of main interest for photovoltaic and optoelectronic applications. Shift current, a nonlinear photoresponse, has attracted rec…
`Holographic' treatment of surface disorder on a topological insulator
Kun Woo Kim, Roger S. K. Mong, Marcel Franz +1
The effect of surface disorder on electronic systems is particularly interesting for topological phases with surface and edge states. Using exact diagonalization, it has been demon…
Semiclassical approach to 2d impurity bound states in Dirac systems
Kun W. Kim, T. Pereg-Barnea, G. Refael
The goal of this paper is to provide an intuitive and useful tool for analyzing the impurity bound state problem. We develop a semiclassical approach and apply it to an impurity in…
A non-perturbative expression for the transmission through a leaky chiral edge mode
Kun W. Kim, Israel Klich, Gil Refael
Chiral edge modes of topological insulators and Hall states exhibit non-trivial behavior of conductance in the presence of impurities or additional channels. We will present a simp…
Transport through a disordered topological-metal strip
Alexandra Junck, Kun W. Kim, Doron L. Bergman +2
Features of a topological phase, and edge states in particular, may be obscured by overlapping in energy with a trivial conduction band. The topological nature of such a conductor,…