51 citations · 118 across the 9 of their papers we have counts for
10 papers
Entropy-driven transitions between extended integer and fractional quantum Hall regimes
Kyung-Su Kim, Steven A. Kivelson
Electronic states with coexisting Wigner-crystal order can sometimes exhibit a quantum Hall effect over a finite range of electron densities---i.e., exhibit ``extended'' quantum Ha…
Semi-classical theory of bipolaronic superconductivity in a bond-modulated electron-phonon model
Kyung-Su Kim, Zhaoyu Han, John Sous
We analyze the transition temperature of bipolaronic superconductivity in a bond Su-Schrieffer-Heeger (bond-SSH) model -- also known as a bond Peierls model -- where the elec…
Dynamical defects in a two-dimensional Wigner crystal: self-doping and kinetic magnetism
Kyung-Su Kim, Ilya Esterlis, Chaitanya Murthy +1
We study the quantum dynamics of interstitials and vacancies in a two-dimensional Wigner crystal (WC) using a semi-classical instanton method that is asymptotically exact at low de…
Two-fluid theory of composite bosons and fermions and the quantum Hall proximity effect
Zhaoyu Han, Kyung-Su Kim, Steven A. Kivelson +1
We propose a two-fluid description of fractional quantum Hall systems, in which one component is a condensate of composite bosons and the other a Fermi liquid formed by composite f…
Exact hole-induced flavor-singlets in certain Hubbard models
Kyung-Su Kim, Hosho Katsura
We prove that the motion of a single hole induces flavor-singlets in the (Fermi) Hubbard model on a Husimi-like tree graph. The result is also generalize…
Interstitial-induced ferromagnetism in a two-dimensional Wigner crystal
Kyung-Su Kim, Chaitanya Murthy, Akshat Pandey +1
The two-dimensional Wigner crystal (WC) occurs in the strongly interacting regime () of the two-dimensional electron gas (2DEG). The magnetism of a pure WC is determined…
Exact Hole-induced Resonating-Valence-Bond Ground State in Certain Hubbard Models
Kyung-Su Kim
We prove that the motion of a single hole induces the nearest-neighbor resonating-valence-bond ground state in the Hubbard model on a triangular cactus - a tree-like var…
Discovery of an insulating ferromagnetic phase of electrons in two dimensions
Kyung-Su Kim, Steven A. Kivelson
This is a commentary on two papers (PNAS 117 (51) 32244-32250 (2020) and arXiv:2011.06721), which observed a series of ordering transitions in a strongly correlated two-dimensional…
The Quantum Hall Effect in the Absence of Disorder
Kyung-Su Kim, Steven A. Kivelson
It is widely held that disorder is essential to the existence of a finite interval of magnetic field in which the Hall conductance is quantized, i.e. for the existence of `plateaus…
Magnon topology and thermal Hall effect in trimerized triangular lattice antiferromagnet
Kyung-Su Kim, Ki Hoon Lee, Suk Bum Chung +1
The non-trivial magnon band topology and its consequent responses have been extensively studied in two-dimensional magnetisms. However, the triangular lattice antiferromagnet (TLAF…