2024

Electronic rotons and Wigner crystallites in a two-dimensional dipole liquid

Soobin Park, Minjae Huh, Chris Jozwiak, Eli Rotenberg, Aaron Bostwick and Keun Su Kim*.

Nature 634, 813-817 (2024)
See also, [KBS] , [MBC] , [SBS] , [ChosunBiz] , [Dongailbo] , [Yonhapnews] , [Kukminilbo] , [Maeil Shinmun] ,
[Seoul Economic Daily] , [News1] , [Ohmynews] , [Dongascience]

Dark states of electrons in a quantum system with two pairs of sublattices

Yoonah Chung^†, Minsu Kim^†, Yeryn Kim^†, Seyeong Cha, Joon Woo Park, Jeehong Park, Yeonjin Yi, Dongjoon Song, Jung Hyun Ryu, Kimoon Lee, Timur K. Kim, Cephise Cacho, Jonathan Denlinger, Chris Jozwiak, Eli Rotenberg, Aaron Bostwick & Keun Su Kim*

Nature Physics 20, 1582-1588 (2024)
See also, [Research Briefing] , [New Scientist] , [Phys.org] , [Yahoo!] , [MSN] , [MBC] , [Chosunilbo] , [Dongailbo] , [Hankookilbo] , [Kyunghyang] , [kukminilbo] , [Yonhapnews] , [Maeilbusiness] , [Ohmynews]

Double Dirac nodal lines enforced by multiple nonsymmorphic symmetries

Gijeong An^†, Yoonseok Hwang^†, Yunjae Kim^†, Changmo Kang, Yoonah Chung, Minsu Kim, Seyeong Cha, Changmin Jin, Yeryn Kim, Suklyun Hong*, Bohm-Jung Yang* &  Keun Su Kim*

Phys. Rev. B 109, 155146 (2024)

2023

Order-disorder phase transition driven by interlayer sliding in lead iodides

Seyeong Cha^†, Giyeok Lee^†, Sol Lee, Sae Hee Ryu, Yeongsup Sohn, Gijeong An, Changmo Kang, Minsu Kim, Kwanpyo Kim, Aloysius Soon* & Keun Su Kim*

Nature Communications 14, 1981 (2023)

2022

Quantum transport evidence of isolatees topological nodal-line fermions

Hoil Kim, Jong Mok Ok, Seyeong Cha, Bo Gyu Jang, Chang Il Kwon, Yoshimitsu Kohama,
Koichi Kindo, Won Joon Cho, Eun Sang Choi, Youn Jung Jo, Woun Kang, Ji Hoon Shim ,
Keun Su Kim & Jun Sung Kim

Nature Communications 13, 7188 (2022)

Three-Terminal Ovonic Threshold Switch (3T-OTS) with Tunable Threshold Voltage for Versatile Artificial Sensory Neurons

Hyejin Lee, Seong Won Cho, Seon Jeong Kim, Jaesang Lee, Keun Su Kim, Inho Kim,
Jong-Keuk Park, Joon Young Kwak, Jaewook Kim, Jongkil Park, YeonJoo Jeong,
Gyu Weon Hwang, Kyeong-Seok Lee, Daniele Ielmini, and Suyoun Lee*

Nano Letters 22, 733-739 (2022)

2021

Pseudogap in a crystalline insulator doped by disordered metals

Sae Hee Ryu^†, Minjae Huh^†, Do Yun Park^†, Chris Jozwiak, Eli Rotenberg, Aaron Bostwick and
Keun Su Kim*.

Nature 596, 68-73 (2021)
See also, [MBC] , [Hankyoreh] , [Hankookilbo] , [Yonhapnews] , [YTN] , [HanKyung] , [Newsis] , [News1]

Electronic band structure of Bi-intercalate layers in graphene and SiC(0001)

Yeongsup Sohn, Sung Won Jung, Fabian Göhler, Woo Jong Shin, Seyeong Cha, Thomas Seyller and Keun Su Kim*.

Journal of the Korean Physical Society 78, 157-163 (2021)

Graphene p-n junction formed on SiC(0001) by Au intercalation

Yeongsup Sohn, Woo Jong Shin, Sae Hee Ryu, Minjae Huh, Seyeong Cha and Keun Su Kim*.

Journal of the Korean Physical Society 78, 40-44 (2021)

2020

Black phosphorus as a bipolar pseudospin semiconductor.

Sung Won Jung^†, Sae Hee Ryu^†, Woo Jong Shin^†, Yeongsup Sohn, Minjae Huh, Roland J. Koch, Chris Jozwiak, Eli Rotenberg, Aaron Bostwick, and Keun Su Kim*.

Nature Materials 19, 277–281 (2020)
See also, [Nature Materials]

Electron-phonon coupling in the ordered phase of Rb on monolayer graphene.

Woo Jong Shin, Sung Won Jung, Yeongsup Sohn, Sae Hee Ryu, Minjae Huh, and Keun Su Kim*.

Current Applied Physics 20, 4 (2020)

Renormalization of Dirac cones by correlation effects in heavily-doped graphene.

Woo Jong Shin, Yeongsup Sohn, Sae Hee Ryu, Minjae Huh, Sung Won Jung, and Keun Su Kim*.

Journal of the Korean Physical Society 76, 44-48 (2020)

2019

Tracing the initial state of surface oxidation in black phosphorus.

Kyoung Hun Oh, Sung Won Jung, and Keun Su Kim*.

Applied Surface Science 504, 144341 (2019)

Closing the surface bandgap in thin Bi₂Se₃/Graphene heterostructures.

Jimin Chae, Seoung-Hun Kang, Sang Han Park, Hanbum Park, Kwangsik Jeong, Tae Hyeon Kim, Seok-Bo Hong, Keun Su Kim, Young-Kyun Kwon, Jeong Won Kim, and Mann-Ho Cho*.

ACS Nano 13, 4, 3931−3939 (2019)

2018

Holstein polaron in a valley-degenerate two-dimensional semiconductor.

Mingu Kang, Sung Won Jung, Woo-Jong Shin, Yeongsup Sohn, Sae Hee Ryu, Timur Kim,
Moritz Hoesch, and Keun Su Kim*.

Nature Materials 17, 676-680 (2018)
See also, [Nature Materials]

2017

Two-Dimensional Dirac Fermions Protected by Space-Time Inversion Symmetry in Black Phosphorus.

Jimin Kim, Seung Su Baik, Sung Won Jung, Yeongsup Sohn, Sae Hee Ryu, Hyoung Joon Choi, Bohm-Jung Yang, and Keun Su Kim*.

Physical Review Letters 119, 226801 (2017)


Quasiparticles and charge transfer at the two surfaces of the honeycomb iridate Na₂IrO₃.

L. Moreschini*, I. Lo Vecchio, N. P. Breznay, S. Moser, S. Ulstrup, R. Koch, J. Wirjo, C. Jozwiak,
K. S. Kim, E. Rotenberg, A. Bostwick, J. G. Analytis, and A. Lanzara.

Physical Review B 96, 161116 (2017)


Universal Mechanism of Band-Gap Engineering in Transition-Metal Dichalcogenides.

Mingu Kang, Beomyoung Kim, Sae Hee Ryu, Sung Won Jung, Jimin Kim, Luca Moreschini,
Chris Jozwiak, Eli Rotenberg, Aaron Bostwick, and Keun Su Kim*.

Nano Letters 17, 1610−1615 (2017)

2016

Electronic band structure of surface-doped black phosphorus.

Jimin Kim, Minjae Huh, Sung Won Jung, Sae Hee Ryu, Yeongsup Sohn, and Keun Su Kim*.

Journal of Electron Spectroscopy and Related Phenomena 219, 86−91 (2016)


Nature and topology of the low-energy states in ZrTe₅.

L. Moreschini*, J. C. Johannsen, H. Berger, J. Denlinger, C. Jozwiack, E. Rotenberg, K. S. Kim,
A. Bostwick, and M. Grioni.

Physical Review B 94, 081101 (2016)


Band-tail transport of CuSCN: Origin of hole extraction enhancement in organic photovoltaics.

Minju Kim, Soohyung Park, Junkyeong Jeong, Dongguen Shin, Jimin Kim, Sae Hee Ryu,
Keun Su Kim, Hyunbok Lee*, and Yeonjin Yi*.

The Journal of Physical Chemistry Letters 7, 2856 (2016)


Sublattice interference as the origin of σ band kinks in graphene.

Sung Won Jung, Woo Jong Shin, Jimin Kim, Luca Moreschini, Han Woong Yeom, Eli Rotenberg, Aaron Bostwick, and Keun Su Kim*.

Physical Review Letters 116, 186802 (2016)


A novel quasi-one-dimensional topological insulator in bismuth iodide β-Bi₄I₄.

Gabriel Autes^†, Anna Isaeva^†, Luca Moreschini^†, Jens C. Johansen^†, Andrea Pisoni, Ryo Mori,
Wentao Zhang, Taisia G. Filatova, Alexey N. Kuznetsov, Laszlo Forro, Wouter Van den Broek,
Yeongkwan Kim, Keun Su Kim, Alessandra Lanzara, Jonathan D. Denlinger, Eli Rotenberg,
Aaron Bostwick, Marco Grioni, and Oleg V. Yazyev*.

Nature Materials 15, 154−158 (2016)

2015

Interlayer-state-driven superconductivity in CaC₆ studied by angle-resolved photoemission spectroscopy.

Wonshik Kyung, Yeongkwan Kim, Garam Han, Choonshik Leem, Chul Kim, Yoonyoung Koh, Beomyoung Kim, Youngwook Kim, Jun Sung Kim, Keun Su Kim, Eli Rotenberg, Jonathan D. Denlinger, and Changyoung Kim.

Physical Review B 92, 224516 (2015)


Emergence of two-dimensional massless Dirac fermions, chiral pseudo-spins, and Berry's phase in potassium doped few-layer black phosphorus.

Seung Su Baik, Keun Su Kim, Yeonjin Yi, and Hyoung Joon Choi*.

Nano Letters 15, 7788−7793 (2015)


Observation of tunable band gap and anisotropic Dirac semimetal state in black phosphorus.

Jimin Kim, Seung Su Baik, Sae Hee Ryu, Yeongsup Sohn, Soohyung Park, Byeong-Gyu Park, Jonathan Denlinger, Yeonjin Yi, Hyoung Joon Choi, and Keun Su Kim*.

Science 349, 723−726 (2015)
See also, [Nature Nanotechnology] , [Materials today] , [EurekAlert] , [Phys.org] , [nanowerk] , [Science Daily] , [Yonhapnews] , [KBS] , [DongA] , [Dongascience] , [Kukminilbo] .


Bulk and surface band structure of the new family of semiconductors BiTeX (X=I, Br, Cl).

L. Moreschini*, G. Autes, A. Crepaldi, S. Moser, J. C. Johannsen, K. S. Kim, H. Berger,
Ph. Bugnon, A. Magrez, J. Denlinger, E. Rotenberg, A. Bostwick, O. V. Yazyev, M. Grioni.

Journal of Electron Spectroscopy and Related Phenomena 201, 115 (2015)

2014

Angle-Resolved Photoemission Spectroscopy of Tetragonal CuO: Evidence for Intralayer Coupling Between Cupratelike Sublattices.

S. Moser, L. Moreschini, H.-Y. Yang, D. Innocenti, F. Fuchs, N. H. Hansen, Y. J. Chang,
K. S. Kim, A. L. Walter, A. Bostwick, E. Rotenberg, F. Mila, and M. Grioni.

Physical Review Letters 113, 187001 (2014)


Direct observation of the spin polarization in Au atomic wires on Si(553).

H. W. Yeom*, S. W. Jung, J. S. Shin, J. Kim, K. S. Kim, K. Miyamoto, T. Okuda, H. Namatame,
A. Kimura and M. Taniguchi.

New Journal of Physics 16, 093030 (2014)


Bilayer splitting and wave functions symmetry in Sr₃Ir₂O₇.

L. Moreschini*, S. Moser, A. Ebrahimi, B. Dalla Piazza, K. S. Kim, S. Boseggia,
D. F. McMorrow, H. M. Ronnow, J. Chang, D. Prabhakaran, A. T. Boothroyd,
E. Rotenberg, A. Bostwick, and M. Grioni.

Physical Review B 89, 201114 (2014)


Consequences of Broken Translational Symmetry in FeSe_xTe_1-x.

L. Moreschini*, P. -H. Lin, C. -H. Lin, W. Ku, D. Innocenti, Y. J. Chang, A. L. Walter, K. S. Kim,
V. Brouet, K. -W. Yeh, M. -K. Wu, E. Rotenberg, A. Bostwick, and M. Grioni.

Physical Review Letters 112, 087602 (2014)


The electronic structure of the high-symmetry perovskite iridate Ba₂IrO₄.

S. Moser*, L. Moreschini, A. Ebrahimi, B. Dalla Piazza, M. Isobe, H. Okabe, J. Akimitsu, V. V. Mazurenko, K. S. Kim, A. Bostwick, E. Rotenberg, J. Changm, H. M. Ronnow and M. Grioni.

New Journal of Physics 16, 013008 (2014)

2013

Coexisting massive and massless Dirac fermions in symmetry-broken bilayer graphene.

Keun Su Kim, Andrew L. Walter, Luca Moreschini, Thomas Seyller, Karsten Horn,
Eli Rotenberg, and Aaron Bostwick*

Nature Materials 12, 887-892 (2013)
See also, [LBL news] , [DOE news], [R&D news] , [Graphene times] , [Eurekalert.org] , [Science newsline] , [Materials views] , [Phys.org] , [Asia news] , [Yonhap news] , [Science times] .


Electronic Instability in a Zero-Gap Semiconductor: The Charge-Density Wave in (TaSe₄)₂I.

C. Tournier-Colletta*, L. Moreschini, G. Aut`es, S. Moser, A. Crepaldi, H. Berger, A. L. Walter,
K. S. Kim, A. Bostwick, P. Monceau, E. Rotenberg, O. V. Yazyev, and M. Grioni

Physical Review Letters 110, 236401 (2013)


Tunable Polaronic Conduction in Anatase TiO₂.

S. Moser, L. Moreschini, J. Ja'cimovi'c, O. S. Barisi'c, H. Berger, A. Magrez, Y. J. Chang, K. S. Kim,
A. Bostwick, E. Rotenberg, L. Forr'o, and M. Grioni

Physical Review Letters 110, 196403 (2013)
EDITOR'S SUGGESTION


Small scale rotational disorder observed in epitaxial graphene on SiC(0001).

Andrew L. Walter*, Aaron Bostwick, Florian Speck, Markus Ostler, Keun Su Kim,
Young Jun Chang, Luca Moreschini, Davide Innocenti, Thomas Seyller, Karsten Horn, and Eli Rotenberg

New Journal of Physics 15, 023019 (2013)


Visualizing Atomic-Scale Negative Differential Resistance in Bilayer Graphene.

Keun Su Kim, Tae-Hwan Kim, Andrew L. Walter, Thomas Seyller, Han Woong Yeom*, Eli Rotenberg, and Aaron Bostwick*

Physical Review Letters 110, 036804 (2013)
See also [etnews] , [Yonhap news] , [Asia news] , [MK news] , [News1] , [Daily UNN] , [Science times]

2011

Electronic structure of graphene on single-crystal copper substrates.

Andrew L. Walter*, Shu Nie, Aaron Bostwick, Keun Su Kim, Luca Moreschini, Young Jun Chang, Davide Innocenti, Karsten Horn, Kevin F. McCarty, and Eli Rotenberg

Physical Review B 84, 195443 (2011)


Radial Band Structure of Electrons in Liquid Metals.

Keun Su Kim and Han Woong Yeom*

Physical Review Letters 107, 136402 (2011)
HIGHLIGHTED IN PHYSICS & ADVANCED TECHNOLOGY (KPS)

2010

Conductance transition and interwire ordering of Pb nanowires on Si(557).

H. Morikawa, K. S. Kim, H. W. Yeom*, Y. Kitaoka, T. Hirahara, and S. Hasegawa

Physical Review B 82, 045423 (2010)


Nearly Massless Electrons in the Silicon Interface with a Metal Film.

Keun Su Kim, Sung Chul Jung, Myung Ho Kang, and Han Woong Yeom*

Physical Review Letters 104, 246803 (2010)
See also, [New scientist] , [MT] , [Hankyung] , [MK] , [Hani] , [Digital times] , [Hankookilbo] , [Yonhap news] .

2009

Two-dimensional electron gas formed on the indium-adsorbed Si(111)sqrt(3)xsqrt(3)-Au surface.

J. K. Kim, K. S. Kim, J. L. McChesney, E. Rotenberg, H. N. Hwang, C. C. Hwang, and H. W. Yeom*

Physical Review B 80, 075312 (2009)


Giant Kink in Electron Dispersion of Strongly Coupled Lead Nanowires.

Keun Su Kim and Han Woong Yeom*

Nano Letters 9, 1916 (2009)
See also, [Nature Asia Materials]

2008

High-resolution core-level photoemission study of dense Pb overlayers on Si(111).

Won Hoon Choi, Keun Su Kim, and Han Woong Yeom*

Physical Review B 78, 195425 (2008)


Electronic structure of Au-induced surface phases on Si(110): LEED and angle-resolved photoemission measurements.

Se Hun Kang, Keun Su Kim, and Han Woong Yeom*

Physical Review B 78, 075315 (2008)

2007

Strong Lateral Electron Coupling of Pb Nanowires on Stepped Si(111): Angle-Resolved Photoemission Studies.

Keun Su Kim, Harumo Morikawa, Won Hoon Choi, and Han Woong Yeom*

Physical Review Letters 99, 196804 (2007)
HIGHLIGHTED IN PHYSICS & ADVANCED TECHNOLOGY (KPS)


Scanning tunneling microscopy observation of Pb-induced superstructures on Si(557).

Harumo Morikawa, Keun Su Kim, Duk Yong Jung, and Han Woong Yeom*

Physical Review B 76, 165406 (2007)


Photoemission study of the anisotropic phase formation of Pb on Si(557).

K. S. Kim, W. H. Choi, and H. W. Yeom*

Physical Review B 75, 195324 (2007)