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Hwang Research Group
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  • Members
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    • Graphene
    • Kondo effect
    • Electronic-electron interactions
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Citations

Submitted

78. Quasidegenerate charge-density wave states in 1T-TiSe2

Seungok Mun, Woojin Choi, Hayoon Im, Sung-Kwan Mo, Choongyu Hwang, Jinwoong Hwang*, and Heung-Sik Kim*

[PDF preprint]

77. Electronic instability induced by photoresist in solution processed amorphous In-Ga-Zn-O thin film transistors

Jinho Jeon, Hyunkyung Lee, Kyungmin Lee, Sang Eon Park, Songkil Kim, Sungkyun Park, Choongyu Hwang, Kanghyun Kim*, and Haeyong Kang*

76. Plasmonic polaron in self-intercalated 1T-TiS2

Byoung Ki Choi*, Woojin Choi, Zhiyu Tao, Ji-Eun Lee, Sae Hee Ryu, Seungrok Moon, Hyobeom Lee, Kyoungree Park, Seha Lee, Hayoon Im, Yong Zhong, Hyejin Ryu, Min Jae Kim, Sue Hyeon Hwang, Xuetao Zhu, Jiandong Guo, Jong Mok Ok, Jaekwang Lee, Haeyong Kang, Sungkyun Park, Jonathan D. Denlinger, Heung-Sik Kim, Aaron Bostwick, Zhi-Xun Shen, Choongyu Hwang*, Sung-Kwan Mo*, and Jinwoong Hwang* 

2025

75. Giant Hole-doping in 2H-WSe2 via Ta Substitution

Minhee Kang†, Woojin Choi†, Choongyu Hwang, and Jinwoong Hwang*

Appl. Sci. Converg. Technol. 34, 194 (2025) [PDF preprint]

74. Unusual ferromagnetic band evolution and high Curie temperature in monolayer 1T-CrTe2 on bilayer graphene

Kyoungree Park†, Ji-Eun Lee†, Dongwook Kim, Yong Zhong, Camron Farhang, Hyobeom Lee, Hayoon Im, Woojin Choi, Seha Lee, Seungrok Mun, Kyoo Kim, Jun Woo Choi, Hyejin Ryu, Jing Xia, Heung-Sik Kim, Choongyu Hwang, Ji Hoon Shim, Zhi-Xun Shen*, Sung-Kwan Mo*, and Jinwoong Hwang*

Small 21, e06671 (2025) [PDF preprint]

73. Dichotomous temperature response in the electronic structure of epitaxially-grown altermagnet MnTe

Ji-Eun Lee, Yong Zhong, Qile Li, Mark Edmonds, Zhi-Xun Shen, Choongyu Hwang, and Sung-Kwan Mo*

Nano Lett. 25, 8969 (2025) [PDF preprint]

ALS Science Brief "The Quest for an Altermagnet"

2024

72. Topological Surface States of Semimetal TaSb2

Ji-Eun Lee, Yu Liu, Jinwoong Hwang, Choongyu Hwang, Cedomir Petrovic, Se Young Park*, Hyejin Ryu*, and Sung-Kwan Mo*

Nano Converg. 11, 50 (2024) [PDF preprint] 

71. Band-selective simulation of photoelectron intensity and converging Berry phase in trilayer graphene

Hayoon Im, Sue Hyeon Hwang, Minhee Kang, Kyoo Kim, Haeyong Kang*, and Choongyu Hwang*

Appl. Sci. Converg. Technol. 33(4) 91-95 (2024) [PDF preprint]

70. Spin-orbit-splitting-driven nonlinear Hall effect in NbIrTe4

Ji-Eun Lee, Aifeng Wang, Shuzhang Chen, Minseong Kwon, Jinwoong Hwang, Minhyun Cho, Ki-Hoon Son, Dong-Soo Han, Jun Woo Choi, Young Duck Kim, Sung-Kwan Mo, Cedomir Petrovic, Choongyu Hwang*, Se Young Park*, Chaun Jang*, and Hyejin Ryu*

Nat. Commun. 15, 3971 (2024) [PDF preprint]

PNU Research

69. Controlling structure and interfacial interaction of monolayer TaSe2 on bilayer graphene

Hyobeom Lee†, Hayoon Im†, Byoung Ki Choi, Kyoungree Park, Yi Chen, Wei Ruan, Yong Zhong, Ji-Eun Lee, Hyejin Ryu, Michael F Crommie, Zhi-Xun Shen, Choongyu Hwang*, Sung-Kwan Mo*, and Jinwoong Hwang*

Nano Converg. 11, 14 (2024) [PDF preprint]

68. Improving the Electrical Performance of Large-area Graphene Transistors Through Vacuum-assisted Annealing

Hyungkyung Lee, Hyeonseop Lee, Daehyeon Kim, Jinho Jeon, Choongyu Hwang, Sungkyun Park, Jong Mok Ok, Kanghyun Kim, Songil Kim, and Haeyong Kang*

New Phys.: Sae Mulli 74, 8 (2024) [PDF preprint]

2023

67. Electronic structure of above-room-temperature van der Waals ferromagnetic Fe3GaTe2

Ji-Eun Lee, Shaohua Yan, Sehoon Oh, Jinwoong Hwang, Jonathan D. Denlinger, Choongyu Hwang, Hechang Lei,* Sung-Kwan Mo*, Se Young Park*, and Hyejin Ryu*

Nano Lett. 23, 11526 (2023) [PDF preprint]

ALS Science Highlights "Room-temperature 2D Magnet: Electronic-Structure Insights"

66. Enhanced thermoelectric performance of SnSe by controlled vacancy population

Ji-Eun Lee, Kyoo Kim, Van Quang Nguyen, Jinwoong Hwang, Jonathan D. Denlinger, Byung Il Min, Sunglae Cho, Hyejin Ryu*, Choongyu Hwang*, Sung-Kwan Mo*

Nano Converg. 10, 32 (2023) [PDF preprint]

66. Signatures of the exciton gas phase and its condensation in monolayer 1T-ZrTe2

Yekai Song, Chunjing Jia, Hongyu Xiong, Binbin Wang, Zhicheng Jiang, Kui Huang, Jinwoong Hwang, Zhuojun Li, Choongyu Hwang, Zhongkai Liu, Dawei Shen, Jonathan Sobota, Patrick Kirchmann, Jiamin Xue, Thomas P. Devereaux, Sung-Kwan Mo*, Zhi-Xun Shen*, Shujie Tang*

Nat. Commun. 14, 1116 (2023) [PDF preprint]

64. Modified Dirac fermions in the crystalline xenon and graphene Moire heterostructure

Suji Im†, Hayoon Im†, Kyoo Kim†, Ji-Eun Lee, Jinwoong Hwang, Sung-Kwan Mo*, Choongyu Hwang* (†: equal contribution)

Adv. Phys. Res. 2, 2200091 (2023) [PDF preprint]

2022

63. Dimensionality and bonding characters of Cu2Si self-assembled on Si(111)

Hyun-Jeong Joo, Ji-Eun Lee, Jae-Hyeon Eom, Byeong-Gyu Park, and Choongyu Hwang*

J. Korean Phys. Soc. 81, 779 [PDF preprint]

62. A novel √19x√19 superstructure in epitaxially grown 1T-TaTe2

Jinwoong Hwang†*, Yeongrok Jin†, Canxun Zhang, Tiancong Zhu, Kyoo Kim, Yong Zhong, Ji-Eun Lee, Zongqi Shen, Yi Chen, Wei Ruan, Hyejin Ryu, Choongyu Hwang, Jaekwang Lee, Michael F. Crommie, Sung-Kwan Mo*, and Zhi-Xun Shen*

Adv. Mater. 34, 2204579 (2022) [PDF preprint]

PNU Research

61. Large-gap insulating dimer ground state in monolayer IrTe2

Jinwoong Hwang†*, Kyoo Kim†, Canzun Zhang†, Tiancong Zhu, Charlotte Herbig, Sooran Kim, Bongjae Kim, Yong Zong, Mohamed Salah, Mohamed M. El-Desoky, Choongyu Hwang, Zhi-Xun Shen, Michael F. Crommie, and Sung-Kwan Mo*

Nat. Commun. 13, 906 (2022) [PDF preprint]

ALS Science Highlights "A Novel Insulating State Emerges in a 2D Material"

2021

60. Surface oxidation in a van der Waals ferromagnet Fe3-xGeTe2

Dong Seob Kim, Jung Yun Kee, Ji-Eun Lee, Yu Liu, Younghak Kim, Namdong Kim, Choongyu Hwang, Wondong Kim, Cedomir Petrovic, Dong Ryeol Lee, Chaun Jang*, Hyejin Ryu*, and Jun Woo Choi*

Curr. Appl. Phys. 30, 40 (2021) [PDF preprint]

59. Angle-resolved photoemission spectroscopy studies of electron-electron interactions in graphene

Choongyu Hwang* and Hae-Yong Kang 

Curr. Appl. Phys. 30, 27 (2021) [PDF preprint]

58. Advanced materials characterization using synchrotron radiation (Editorial)

Jun Woo Choi*, Jung Hwa Seo*, Choongyu Hwang*, Byoung Ick Cho*, Dong Ryeol Lee*, and Young Jun Chang*

Curr. Appl. Phys. 30, 1 (2021) [PDF preprint]

57. Evidence for quantum spin liquid behavior in single-layer 1T-TaSe2 from scanning tunneling microscopy

Wei Ruan, Yi Chen, Shujie Tang, Jinwoong Hwang, Hsin-Zon Tsai, Ryan Lee, Meng Wu, Hyejin Ryu, Salman Kahn, Franklin Liou, Caihong Jia, Andrew Aikawa, Choongyu Hwang, Feng Wang, Yongseong Choi, Steven Louie, Patrick Lee, Zhi-Xun Shen, Sung-Kwan Mo, and Michael Crommie*

Nat. Phys. 17, 1154 (2021) [PDF preprint]

Nat. Phys. NEWS & VIEWS [PDF preprint]

56. The low-energy electron band structure of a two-dimensional Dirac nodal-line semimetal grown on silicon surface

Hyun-Jeong Joo, Choongyu Hwang*, and Kyoo Kim 

J. Korean Phys. Soc. 78, 34 (2021) [PDF preprint]

2020

55. High-quality SnSe2 single crystals: Electronic and thermoelectric properties

Anh-Tuan Pham, Hoa T. Vu, Cheng Chang, Ly T. Trinh, Ji-Eun Lee, Hyejin Ryu, Choongyu Hwang, Sung-Kwan Mo, Jungdae Kim, Li-dong Zhao, Anh-Tuan Duong, and Sunglae Cho*

ACS Appl. Energy Mater. 3, 10787 (2020) [PDF preprint]

54. Tunable Kondo resonance at a pristine two-dimensional Dirac semimetal on a Kondo insulator

Jinwoong Hwang†, Seungseok Lee†, Ji-Eun Lee, Minhee Kang, Hyejin Ryu, Hyunjeong Joo, Jonathan Denlinger, Jae-Hoon Park*, and Choongyu Hwang*

Nano Lett. 20, 7973 (2020) [PDF preprint]

53. A plausible method of preparing the ideal p-n junction interface of a thermoelectric material by surface doping

Ji-Eun Lee, Jinwoong Hwang, Minhee Kang, Hyun-Jeong Joo, Hyejin Ryu, Kyoo Kim, Yongsam Kim, Namdong Kim, Anh Tuan Duong, Sunglae Cho, Sung-Kwan Mo, Choongyu Hwang*, and Imjeong Ho-Soon Yang*

Appl. Surf. Sci. 520, 146314 (2020) [PDF reprint]

52. Controlling the magnetic anisotropy of van der Waals ferromagnet Fe3GeTe2

Se Young Park, Dong Seob Kim, Yu Liu, Jinwoong Hwang, Younghak Kim, Wondong Kim, Jae-Young Kim, Cedomir Petrovic, Choongyu Hwang, Sung-Kwan Mo, Byung-Jun Kim, Byoung-Chul Min, Hyun Cheol Koo, Joonyeon Chang, Chaun Jang*, Jun Woo Choi*, and Hyejin Ryu*

Nano Lett. 20, 95 (2020) [PDF preprint]

2019

51. Identifying substitutional oxygen as a prolific point defect in monolayer transition metal dichalcogenides

Sara Barja*, Sivan Refaely-Abramson, Bruno Schuler, Diana Y. Qiu, Artem Pulkin, Sebastian Wickenburg, Hyejin Ryu, Miguel M. Ugeda, Christoph Kastl, Christopher Chen, Choongyu Hwang, Adam Schwartzberg, Shaul Aloni, Sung-Kwan Mo, D. Frank Ogletree, Michael F. Crommie, Oleg V. Yazyev, Steven G. Louie*, Jeffrey B. Neaton*, Alexander Weber-Bargioni*

Nat. Commun. 10, 3382 (2019) [PDF preprint]

50. Ultrafast dynamics of electron-phonon coupling in a metal

Choongyu Hwang*, Wentao Zhang, Koshi Kurashima, Robert Kaindl, Tadashi Koike, and Alessandra Lanzara

EPL 126(5), 57001 (2019) [PDF preprint]

49. Concomitant enhancement of electron-phonon coupling and electron-electron interaction in graphene decorated with ytterbium

Minhee Kang, Jinwoong Hwang, Ji-Eun Lee, Alexei Fedorov, and Choongyu Hwang*

Appl. Surf. Sci. 467-478, 1 (2019) [PDF reprint]

2018

48. Anisotropic Dirac Fermions in BaMnBi2 and BaZnBi2

Hyejin Ryu†*, Se Young Park†, Lijun Li, Weijun Ren, Jeffrey Neaton, Cedomir Petrovic, Choongyu Hwang, and Sung-Kwan Mo* (†: equal contribution)

Sci. Rep. 8, 15322 (2018) [PDF reprint]

47. Gapped nearly free-standing graphene on an SiC(0001) substrate induced by manganese atoms

Jinwoong Hwang, Ji-Eun Lee, Minhee Kang, Byeong-Gyu Park, Jonathan Denlinger, Sung-Kwan Mo, and Choongyu Hwang*

Appl. Sci. Converg. Technol. 27, 90 (2018)  [PDF reprint]

46.Emergence of Kondo resonance in graphene intercalated with cerium

Jinwoong Hwang†, Kyoo Kim†, Hyejin Ryu, Jingul Kim, Ji-Eun Lee, Sooran Kim, Minhee Kang, Byeong-Gyu Park, Alessandra Lanzara, Jinwook Chung, Sung-Kwan Mo, Jonathan Denlinger, Byung Il Min, and Choongyu Hwang* (†: equal contribution)

Nano Lett. 18, 3661 (2018)  [PDF reprint]

45. Persistent charge-density-wave order in single-layer TaSe2

Hyejin Ryu*, Yi Chen, Heejung Kim, Hsin-Zon Tsai, Shujie Tang, Juan Jiang, Franklin Liou, Salman Kahn, Caihong Jia, Arash A. Omrani, Ji Hoon Shim, Zahid Hussain, Zhi-Xun Shen, Kyoo Kim, Byung Il Min, Choongyu Hwang, Michael F. Crommie, and Sung-Kwan Mo*

Nano Lett. 18, 689 (2018) [PDF reprint]

44. Electronic structure of monolayer 1T'-MoTe2 grown by molecular beam epitaxy

Shujie Tang, Chaofan Zhang, Chunjing Jia, Hyejin Ryu, Choongyu Hwang, Zhi Liu, Makoto Hashimoto, Donghui Lu, Thomas P. Devereaux, Zhi-Xun Shen*, and Sung-Kwan Mo*

APL Mater. 6, 026601 (2018) [PDF reprint]

2017

43. Temperature-modulated electronic structure of graphene on SiC: possible roles of electron-electron interaction and strain

Choongyu Hwang*, Jinwoong Hwang, Ji-Eun Lee, Jonathan Denlinger, and Sung-Kwan Mo

Appl. Phys. Lett. 111, 231603 (2017) [PDF reprint]

42. Temperature-dependent electron-electron interaction in graphene on SrTiO3

Hyejin Ryu†, Jinwoong Hwang†, Debin Wang, Ankit S. Disa, Jonathan Denlinger, Yuegang Zhang, Sung-Kwan Mo*, Choongyu Hwang*, and Alessandra Lanzara (†: equal contribution)

Nano Lett. 17, 5914 (2017) [PDF reprint]

41. ARPES study of the epitaxially grown topological crystalline insulator SnTe(111) 

Yi Zhang, Zhongkai Liu, Bo Zhou, Yeongkwan Kim, Lexian Yang, Hyejin Ryu, Choongyu Hwang, Yulin Chen, Zahid Hussain, Zhi-Xun Shen, and Sung-Kwan Mo*

J. Electron Spectrosc. Relat. Phenom. 219, 35 (2017) [PDF reprint]

40. Hole doping, hybridization gaps, and electronic correlation in graphene on a platinum substrate

Jinwoong Hwang†, Hwihyeon Hwang†, Min-Jeong Kim, Hyejin Ryu, Ji-Eun Lee, Qin Zhou*, Sung-Kwan Mo, Jaekwang Lee, Alessandra Lanzara, and Choongyu Hwang* (†: equal contribution)

Nanoscale 9, 11498 (2017) [PDF reprint]

39. Quantum spin Hall state in monolayer 1T'-WTe2

Shujie Tang, Chaofan Zhang, Dillon Wong, Zahra Pedramrazi, Hsin-Zon Tsai, Chunjin Jia, Hyejin Ryu, Salman Kahn, Juan Jiang, Hao Yan, Makoto Hashimoto, Donghui Lu, Robert G. Moore, Chancuk Hwang, Choongyu Hwang, Yulin Chen, Zhi Liu, Xiaoming Xie, Thomas P. Devereaux, Michael F. Crommie, Sung-Kwan Mo*, and Zhi-Xun Shen*

Nature Phys. 13, 683 (2017) [PDF reprint]

2016

38. Spin-resolved photoemission study of epitaxially grown MoSe2 and WSe2 thin films 

S. -K. Mo*, Choongyu Hwang, Y. Zhang, M. Fanciulli, S. Muff, H. Dil, Z. -X. Shen, and Z. Hussain

J. Phys.: Condens. Matter 28, 454001 (2016) [PDF reprint]

37. The hybridizations of cobalt 3d bands with the electron band structure of the graphene/cobalt interface on a tungsten substrate

Jinwoong Hwang, Nak-Kawn Chung, A. D. N'Diaye, Jonathan Denlinger, A. K. Schmid, and Choongyu Hwang*

J. Korean Phys. Soc. 69, 573-577 (2016) [PDF reprint]

36. Electronic Structure, Surface Doping, and Optical Response in Epitaxial WSe2 Thin Films 

Yi Zhang*, Miguel M. Ugeda, Chenhao Jin, Su-Fei Shi, Aaron J. Bradley, Ana Martin-Recio, Hyejin Ryu, Jonghwan Kim, Shujie Tang, YeongKwan Kim, Bo Zhou, Choongyu Hwang, Yulin Chen, Feng Wang, Michael F. Crommie, Zahid Hussain, Zhi-Xun Shen, and Sung-Kwan Mo*

Nano Lett. 16, 2485 (2016) [PDF reprint]

35. Study on the high spectral intensity at the Dirac energy of single-layer graphene on an SiC substrate 

Jinwoong Hwang and Choongyu Hwang*

New J. Phys. 18, 043005 (2016) [PDF reprint]

34. Magnetic effects in sulfur-decorated graphene 

Choongyu Hwang*, S. A. Cybart, S. J. Shin, S. Kim, K. Kim, T. G. Rappoport, S. Wu, C. Jozwiak, A. V. Fedorov, S. -K. Mo, D. -H. Lee, B. I. Min, E. E. Haller, R. C. Dynes, A. H. Castro Neto, and A. Lanzara*

Sci. Rep. 6, 21460 (2016) [PDF reprint]

33. Band Modification of Graphene by Using Slow Cs+ Ions 

S. J. Sung, S. -H. Lee, P. R. Lee, J. G. Kim, H. M. Park, M. T. Ryu, N. D. Kim, Choongyu Hwang, S. -H. Jhi, and J. W. Chung*

RSC Adv. 6, 9106-9111 (2016) [PDF reprint]

2015

32. Observation of the intrinsic bandgap behaviour in as-grown epitaxial twisted graphene 

Jeongho Park*, William C. Mitchel, Said Elhamri, Lawrence Grazulis, John Holescher, Krishnamurthy Mahalingam, Choongyu Hwang, Sung-Kwan Mo, and Jonghoon Lee

Nature Commun. 6, 5677 (2015) [PDF reprint]

31. Tight-binding approach to understand photoelectron intensity from graphene for circularly polarized light

Hwihyeon Hwang and Choongyu Hwang* 

J. Electron Spectrosc. Relat. Phenom. 198, 1 (2015) [PDF reprint]

2014

30. Ytterbium-driven strong enhancement of electron-phonon coupling in graphene

Choongyu Hwang*, Duck Young Kim, D. A. Siegel, Kevin T. Chan, J. Noffsinger, A. V. Fedorov, Marvin L. Cohen, Borje Johansson, J. B. Neaton, and A. Lanzara* 

Phys. Rev. B 90, 115417 (2014) [PDF reprint]

29. Ultrafast quenching of electron-boson interaction and superconducting gap in a cuprate superconductor 

Wentao Zhang, Choongyu Hwang, Chirstopher L. Smallwood, Tristan Miller, Greg Affeldt, Koshi Kurashima, Chris Jozwiak, Hiroshi Eisaki, Tadashi Adachi, Yoji Koike, Dung-Hai Lee, and Alessandra Lanzara*

Nature Commun. 5, 4959 (2014) [PDF reprint]

28. Angle-resolved photoemission spectroscopy study on graphene using circularly polarized light 

Choongyu Hwang*

J. Phys.: Condens. Matter 26, 335501 (2014) [PDF reprint]

2007~2013 at LBNL

27. Photoelectron spin-flipping and texture manipulation in a topological insulator 

Chris Jozwiak, Cheol-Hwan Park, Kenneth Gotlieb, Choongyu Hwang, Dung-Hai Lee, Steven G. Louie, Jonathan D. Denlinger, Costel R. Rotundu, Robert J. Birgeneau, Zahid Hussain, and Alessandra Lanzara*

Nature Phys. 9, 293-298 (2013) [PDF reprint]

26. Electron-phonon coupling and intrinsic bandgap in highly-screened graphene 

David A Siegel, Choongyu Hwang, Alexei V Fedorov, and Alessandra Lanzara*

New J. Phys. 14, 095006 (2012) [PDF reprint]


25. Fermi velocity engineering in graphene by substrate modification

Choongyu Hwang, David A. Siegel, Sung-Kwan Mo, William Regan, Ariel Ismach, Yuegang Zhang, Alex Zettl, and Alessandra Lanzara*

Sci. Rep. 2, 590 (2012) [PDF reprint]


24. Direct measurement of quantum phases in graphene via photoemission spectroscopy

Choongyu Hwang, Cheol-Hwan Park, David A. Siegel, Alexei V. Fedorov, Steven G. Louie*, and Alessandra Lanzara*

Phys. Rev. B 84, 125422 (2011). *Editors' Suggestion

23. Many-body interactions in quasi-freestanding graphene

David A. Siegel, Cheol-Hwan Park, Choongyu Hwang, Jack Deslippe, Alexei V. Fedorov, Steven G. Louie, and Alessandra Lanzara*

PNAS 108, 11365-11369 (2011)

22. Observation of intrinsic intraband pi-plasmon excitation of a single-layer graphene

S. Y. Shin, C. G. Hwang, S. J. Sung, N. D. Kim, H. S. Kim, and J. W. Chung*

Phys. Rev. B 83, 161403(R) (2011)


21. New synthesis method for the growth of epitaxial graphene

X.Z. Yu, C.G. Hwang, C.M. Jozwiak, A. Kohl, A.K. Schmid, and A. Lanzara*

J. Electron Spectrosc. Relat. Phenom. 184, 100-106 (2011)


20. Crossover region between nodal and antinodal states at the Fermi level of optimally doped and overdoped Bi2Sr1.6Nd0.4Cu2O6+δ

D. R. Garcia, J. Graf, C. Jozwiak, C. G. Hwang, H. Eisaki, and A. Lanzara*

Phys. Rev. B 81, 184527 (2010)


19. Quasifreestanding multilayer graphene films on the carbon face of SiC

D. A. Siegel, C. G. Hwang, A. V. Fedorov, and A. Lanzara*

Phys. Rev. B 81, 241417(R) (2010)


18. Resonant photoluminescent charging of epitaxial graphene

S. D. Lounis, D. A. Siegel, R. Broesler, C. G. Hwang, E. E. Haller, and A. Lanzara*

Appl. Phys. Lett. 96, 151913 (2010)


17. Stability of graphene band structures against an external periodic perturbation; Na on Graphene

C. G. Hwang, S. Y. Shin, S. -M. Choi, N. D. Kim, S. H. Uhm, H. S. Kim, C. C. Hwang, D. Y. Noh, S. -H. Jhi, and J. W. Chung* 

Phys. Rev. B 79, 115439 (2009) *Selected article in Vir. J. Nano. Sci. & Tech. 19 (2009)


16. Core-level and valence-band study using angle-integrated photoemission on LaFeAsO0.9F0.1

D. R. Garcia, C. Jozwiak, C. G. Hwang, A. Fedorov, S. M. Hanrahan, S. D. Wilson, C. R. Rotundu, B. K. Freelon, R. J. Birgeneau, E. Bourret-Courchesne, and A. Lanzara* 

Phys. Rev. B 78, 245119 (2008)


15. Observation of Impurity-Driven Metal-Insulator Transitions in Quasi-1D Nanowires on a (Na, Li)-Added In/Si (111)-4x1 Surface

S. S. Lee, S. Y. Shin, C. G. Hwang, and J. W. Chung* 

J. Kor. Phys. Soc. 53, 3667 (2008)


14. Vibrational properties of Na nanoclusters self-assembled on Si(111) surface

C. G. Hwang, N. D. Kim, S. Y. Shin, J. W. Chung*, J. H. Nam, M. K. Kim, C. Y. Park, and J. R. Ahn 

Surf. Sci. 602, 2300-2304 (2008)


13. Self-trapping nature of Tl nanoclusters on the Si (111)-7x7 surface

C. G. Hwang, N. D. Kim, G. Lee, S. Y. Shin, J. S. Kim, and J. W. Chung* 

New J. Phys. 10, 053013 (2008)


12. Observation of a Temperature-Induced Phase Transition on the Si(5 5 12) Surface

S. H. Uhm, C. G. Hwang, S. Y. Shin, H. S. Kim, and J. W. Chung* 

J. Kor. Phys. Soc. 53, 1065-1069 (2008)


11. Atomic structure of a thallium nanodot lattice formed on the Si (111)-7x7 surface

N. D. Kim, C. G. Hwang, J. W. Chung*, Y. Kim, T. C. Kim, D. Y. Noh, K. Sumitani, H. Tajiri, and O. Sakata 

Surf. Sci. 602, 369-374 (2008)

2000~2007 at POSTECH

10. Ab initio study of thallium nanoclusters on Si (111)-7x7

G. Lee, C. G. Hwang, N. D. Kim, J. Chung, J. S. Kim*, and S. Lee 

Phys. Rev. B 76, 245409 (2007)


9. Origin of unusual work function change upon forming Tl nanoclusters on Si (111)-7x7 surface

C. G. Hwang, N. D. Kim, G. Lee, S. Y. Shin, S. H. Uhm, H. S. Kim, J. S. Kim, J. W. Chung* 

Appl. Phys. A 89, 431-435 (2007)


8. Possible evidence of non-Fermi liquid behaviour from Quasi-one-dimensional indium nanowires

C. G. Hwang, N. D. Kim, S. Y. Shin, and J. W. Chung* 

New J. Phys. 9, 249 (2007)


7. Plasmon excitation observed in quasi one-dimensional nanowires

C. G. Hwang, S. Y. Shin, and J. W. Chung* 

J. Phys.: Conf. Ser. 61, 454 (2007)


6. Formation of thallium islands on the Si (111)-7x7 surface

N. D. Kim, C. G. Hwang, J. W. Chung*, T. C. Kim, and D. Y. Noh 

Phys. Rev. B 72, 035338 (2005)


5. Structural properties of a thallium-induced Si (111)-1x1 surface

N. D. Kim, C. G. Hwang, J. W. Chung*, T. C. Kim, H. J. Kim, and D. Y. Noh 

Phys. Rev. B 69, 195311 (2004)


4. Structural and electronic properties of the quasi-one-dimensional metallic chains of the Au-induced facets on the Si(5 5 12) surface

S. S. Lee, N. D. Kim, C. G. Hwang, H. J. Song, and J. W. Chung* 

Phys. Rev. B 66, 115317 (2002)


3. Structural and electronic properties of the Si-rich 6H-SiC(0001) surface

J. R. Ahn, S. S. Lee, N. D. Kim, C. G. Hwang, J. H. Min, and J. W. Chung*

Surf. Sci. 516, L529-L534 (2002)

2. Adsorbate-Induced Pinning of a Charge-Density Wave in a Quasi-1D Metallic Chains: Na on the In/Si (111)-(4x1) Surface

S. S. Lee, J. R. Ahn, N. D. Kim, J. H. Min, C. G. Hwang, J. W. Chung*, H. W. Yeom, S. V. Ryjkov, and S. Hasegawa 

Phys. Rev. Lett. 88, 196401 (2002)

  1. Observation of disorder-induced 2D Mott-Hubbard states of the alkali-earth metal (Mg, Ba)-adsorbed Si(111) surface

J. R. Ahn, S. S. Lee, N. D. Kim, J. H. Min, C. G. Hwang, and J. W. Chung* 

Phys. Rev. Lett. 84, 1748-1751 (2000)

Department of Physics

Pusan National University

2 Busandaehak-ro 63 Beon-gil, Geumjeong-gu, Pusan 46241, South Korea


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