* corresponding author(s)

† co-first authorship


[33] Completely anisotropic ultrafast optical switching and direction-dependent photocarrier diffusion in layered ZrTe5

Sung Bok Seo, Sanghee Nah, Muhammad Sajjad†, Jiacheng Song, Nirpendra Singh, Sang Ho Suk, Hionsuck Baik, Sanghoon Kim, Geun-Ju Kim, Jung-Il Kim and Sangwan Sim*

Advanced Optical Materials, accepted (2022)

[32] Ultrafast tunable broadband optical anisotropy in two-dimensional ReS2

Sung Bok Seo, Sanghee Nah, Muhammad Sajjad†, Nirpendra Singh, Youngwook Shin, Younghyun Kim, Jaekyun Kim, Sangwan Sim*

Physical Review Applied 18, 014010 (2022) (link)

[31] Anomalous oscillating behavior of ultrafast spatiotemporal hot carrier diffusion in two-dimensional PtSe2

Sung Bok Seo, Sanghee Nah, Jiacheng Song, Sangwan Sim*

ACS Photonics  9, 5, 1783-1792 (2022) (link)

[30] (invited review article) Anisotropic excitons in 2D rhenium dichalcogenides: a mini-review

Seongkwang Bae, Sangwan Sim*

Journal of the Korean Physical Society 81, 532-548 (2021) (link)


[29] Exciton-dominated ultrafast optical response in atomically thin PtSe2

Seongkwang Bae, Sanghee Nah, Doeon Lee, Muhammad Sajjad, Nirpendra Singh, Ku Min Kang, Sanghoon Kim, Geun-Ju Kim, Jaekyun Kim, Hionsuck Baik, Kyusang Lee*, Sangwan Sim*

Small 17, 2103400 (2021) (link)

[28] Light absorption and emission dominated by trions in the type-I van der Waals heterostructures

Hyemin Bae, Suk Hyun Kim, Seungmin Lee, Minji Noh, Ouri Karni, Aidan L. O’Beirne, Elyse Barré, Sangwan Sim, Soonyoung Cha, Moon-Ho Jo,
Tony F. Heinz*, Hyunyong Choi*

ACS Photonics 8, 1972-1978 (2021) (link)

[27] Metal-insulator transition and interfacial thermal transport in atomic layer deposited Ru nanofilms characterized by ultrafast terahertz spectroscopy

Hee Jun Shin, Jeong-Min Lee, Seongkwang Bae, Woo-Hee Kim*, Sangwan Sim*

Applied Surface Science 563, 150184 (2021) (link)

[26] Ultrahigh deep-ultraviolet responsivity of a beta-Ga2O3/MgO heterostructure-based phototransistor

Jungho Ahn, Jiyeon Ma, Doeon Lee, Qiubao Lin, Youngseo Park, Oukjae Lee, Sangwan Sim, Kyusang Lee*, Geonwook Yoo*, Junseok Heo*

ACS Photonics 8, 557-566 (2021) (link)

[25] Opposite behavior of ultrafast dynamics of exciton shift and linewidth broadening in bilayer ReS2

Sangwan Sim, Ho-Seung Shin, Doeon Lee, Jekwan Lee, Myungjun Cha, Kyusang Lee, Hyunyong Choi*

Physical Review B 103, 014309 (2021) (link)


[24] Ultrafast Auger process in few-layer PtSe2

Hee Jun Shin, Seongkwang Bae, Sangwan Sim*
Nanoscale 12, 22185 (2020) (link)

[23] Role of weak interlayer coupling in ultrafast exciton-exciton annihilation in two-dimensional rhenium dichalcogenides

Sangwan Sim, Doeon Lee, Jekwan Lee, Myungjun Cha, Soonyoung Cha, Wonhyeok Heo, Sungjun Cho, Wooyoung Shim, Kyusang Lee, Jinkyoung Yoo, Rohit P. Prasankumar, Hyunyong Choi*, Moon-Ho Jo*
Physical Review B 101, 174309 (2020) (link)

[22] Ultrafast relaxation dynamics in bimetallic plasmonic catalysts

Sangwan Sim, Alyssa Bierlie, Philip Mantos, Steven McCrory, Rohit P. Prasankumar*, Sanchari Chowdhury*
Nanoscale 12, 10284-10291 (2020) (link)

[21] Picosecond competing dynamics of apparent semiconducting-metallic phase transition in the topological insulator Bi2Se3

Sangwan Sim†, Seungmin Lee†, Jisoo Moon, Chihun In, Jekwan Lee, Minji Noh, Jehyun Kim, Woosun Jang, Soonyoung Cha, Seung Young Seo, Seongshik Oh, Dohun Kim, Aloysius Soon, Moon-Ho Jo, Hyunyong Choi*

ACS Photonics 7, 3, 759-764 (2020) (link)


[20] Light polarization-controlled conversion of ultrafast coherent-incoherent exciton dynamics in few-layer ReS2.

Sangwan Sim†, Doeon Lee†, Jekwan Lee, Hyemin Bae, Minji Noh, Soonyoung Cha, Moon-Ho Jo, Kyusang Lee, Hyunyong Choi*

Nano Letters 19, 7464 (2019) (link)



[19] Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2.

Sangwan Sim†, Doeon Lee†, Artur V. Trifonov†, Taeyoung Kim, Soonyoung Cha, Ji Ho Sung, Sungjun Cho, Wooyoung Shim, Moon-Ho Jo*, Hyunyong Choi*

Nature Communications 9, 351 (2018) (link)

[18] Generation, transport, and detection of valley-locked spin photocurrent in WSe2-graphene-Bi2Se3 heterostructures.

Soonyoung Cha†, Minji Noh†, Jehyun Kim, Jangyup Son, Hyemin Bae, Doeon Lee, Hoil Kim, Jekwan Lee, Ho-Seung Shin, Sangwan Sim, Seunghoon Yang, Sooun Lee, Wooyoung Shim, Chul–Ho Lee, Moon–Ho Jo, Jun Sung Kim, Dohun Kim, Hyungyong Choi*
Nature Nanotechnology 13, 910 (2018) (link)

[17] Writing monolithic integrated circuits on a two-dimensional semiconductor with a scanning light probe

Seung-Young Seo, Jaehyun Park, Jewook Park, Kyung Song, Soonyoung Cha, Sangwan Sim, Si-Young Choi, Han Woong Yeom, Hyungyong Choi, Moon-Ho Jo*
Nature Electronics 1, 512 (2018) (link)

[16] Surface passivation and carrier collection in {110}, {100} and circular Si microwire solar cells

Yun Goo Ro, Renjie Chen, Ren Liu, Nan Li, Theodore Williamson, Jinkyoung Yoo, Sangwan Sim, Rohit P. Prasankumar, Shadi A. Dayeh*
Advanced Energy Materials 8, 1802154 (2018) (link)

[15] Control over electron-phonon interaction by Dirac plasmon engineering in the Bi2Se3 topological insulator

Chihun In, Sangwan Sim, Beom Kim, Hyemin Bae, Hyunseung Jung, Woosun Jang, Myungwoo Son, Jisoo Moon, Maryam Salehi, Seung Young Seo, Aloysius Soon, Moon-Ho Ham, Hojin Lee, Seongshik Oh, Dohun Kim, Moon-Ho Jo, Hyunyong Choi*
Nano Letters 18, 734 (2018) (link)

[14] Role of spin Hall effect in the topological side surface conduction

Jekwan Lee, Sangwan Sim, Soohyun Park, Chihun In, Seungwan Cho, Seungmin Lee, Soonyoung Cha, Sooun Lee, Hoil Kim, Jehyun Kim, Wooyoung Shim, Jun Sung Kim, Dohun Kim*, Hyunyong Choi*
ACS Photonics 5, 3347 (2018) (link)


[13] Ultrafast hot-carrier photovoltaics of type-I monolayer heterojunctions in the broad spectral ranges

Ji Ho Sung, Soonyoung Cha, Hoseok Heo, Sangwan Sim, Juho Kim, Hyunyong Choi*, Moon-Ho Jo*
ACS Photonics 4, 429 (2017) (link)

[12] Highly-sensitive, gate-tunable, room-temperature mid-infrared photodetection based on graphene-Bi2Se3 heterostructure

Jaeseok Kim, Sungjoon Park, Houk Jang, Nikesh Koirala, Jae-Bok Lee, Un Jeong Kim, Hong-Seok Lee, Young-Geun Roh, Hyangsook Lee, Sangwan Sim, Soonyoung Cha, Chihun In, Jun Park, Jekwan Lee, Minji Noh, Jisoo Moon, Maryam Salehi, Ji Ho Sung, Sang-Soo Chee, Moon-Ho Ham, Moon-Ho Jo, Seongshik Oh, Jong-Hyun Ahn, Sung Woo Hwang, Dohun Kim*, Hyunyong Choi*
ACS Photonics 4, 482 (2017) (link)


[11] Selectively tunable optical Stark effect of anisotropic excitons in atomically thin ReS2

Sangwan Sim†, Doeon Lee, Minji Noh, Soonyoung Cha, Chan Ho Soh, Ji Ho Sung, Moon-Ho Jo, Hyunyong Choi*
Nature Communications 7, 13569 (2016) (link)

[10] Composition control of plasmon-phonon interaction using topological quantum-phase transition in photoexcited (Bi1-xInx)2Se3.

Sangwan Sim†, Jun Park, Nikesh Koirala, Seungmin Lee, Matthew Brahlek, Jisoo Moon, Maryam Salehi, Jaeseok Kim, Soonyoung Cha, Ji Ho Sung, Moon-Ho Jo, Seongshik Oh, Hyunyong Choi*
ACS Photonics 3, 1246 (2016) (link)

[9] 1s intraexcitonic dynamics in monolayer MoS2 probed by ultrafast mid-infrared spectroscopy

Soonyoung Cha, Ji Ho Sung, Sangwan Sim, Jun Park, Hoseok Heo, Moon-Ho Jo*, Hyunyong Choi*
Nature Communications 7, 10768 (2016) (link)

[8] Comparison of hydrogen sulfide gas and sulfur powder for synthesis of molybdenum disulfide nanosheets

Jusang Park, Jeong-Gyu Song, Taejin Choi, Sangwan Sim, Hyunyong Choi, Sang Wook Han, Han-Bo-Ram Lee, Soo-Hyun Kim, Hyungjun Kim*
Current Applied Physics 16, 691 (2016) (link)


[7] Ultra-high modulation depth exceeding 2,400% in the optically-controlled topological surface plasmons

Sangwan Sim, Houk Jang, Nikesh Koirala, Matthew Brahlek, Jisoo Moon, Ji Ho Sung, Jun Park, Soonyoung Cha, Seongshik Oh, Moon-Ho Jo, Jong-Hyun Ahn, Hyunyong Choi*
Nature Communications 6, 8814 (2015) (link)

[6] Tunable Fano quantum-interference dynamics using a topological phase transition in (Bi1-xInx)2Se3

Sangwan Sim, Nikesh Koirala, Matthew Brahlek, Ji Ho Sung, Jun Park, Soonyoung Cha, Moon-Ho Jo, Seongshik Oh, Hyunyong Choi*
Physical Review B 91, 235438 (2015) (link)

[5] Controllable synthesis of molybdenum tungsten disulfide alloy for vertically composition-controlled multilayer

Jeong-Gyu Song, Gyeong Hee Ryu, Su Jeong Lee, Sangwan Sim, Chang Wan Lee, Taejin Choi, Hanearl Jung, Youngjun Kim, Zonghoon Lee, Jae-Min Myoung, Christian Dussarrat, Clement Lansalot-Matras, Jusang Park, Hyunyong Choi, Hyungjun Kim*
Nature Communications 6, 7817 (2015) (link)

[4] Counterbalanced effect of surface trap and Auger recombination on the transverse terahertz carrier dynamics in silicon nanowires

Chihun In, Jungmok Seo, Hyukho Kwon, Jeongmook Choi, Sangwan Sim, Jaeseok Kim, Taeyong Kim, Taeyoon Lee, Hyunyong Choi*
IEEE Transactions on Terahertz Science and Technology 5, 605 (2015) (link)


[3] Ultrafast terahertz dynamics of hot Dirac-electron surface scattering in the topological insulator Bi2Se3

Sangwan Sim, Matthew Brahelk, Nikesh Koirala, Soonyoung Cha, Seongshik Oh, Hyunyong Choi*
Physical Review B 89, 165137 (2014) (link)


[2] Exciton dynamics in atomically thin MoS2: interexcitonic interaction and broadening kinetics

Sangwan Sim, Jusang Park, Jeong-Gyu Song, Chihun In, Yun-Shik Lee, Hyungjun Kim*, Hyunyong Choi*
Physical Review B 88, 075434 (2013) (link)

[1] Ultrafast biexciton spectroscopy in semiconductor quantum dots: evidence for early emergence of multiple-exciton generation

Younghwan Choi, Sangwan Sim, Seong Chu Lim, Young Hee Lee, Hyunyong Choi*
Scientific Reports 3, 3206 (2013) (link)