JournalsInternational conferences / Domestic conferences / Patents  


  1. J. Lee, S. Sim, S. Park, C. In, S. Cho, S. Lee, S. Cha, S. Lee, H. Kim, J. Kim, W. Shim, J. Kim, D. Kim, and H. Choi, “Role of spin Hall effect in the topological side surface conduction,” (2018).
  2. W. Yang, S. Lee, H.-C. Kwon, J. Tan, H. Lee, J. Park, Y. Oh, H. Choi, and J. Moon, “Time-resolved observation of photo-excited charge carrier dynamics in Sb2Se3 photocathodes for photoelectrochemical water splitting: From carrier localization to charge transfer,” (2018).
  3. J. -H. Kim, M. R. Bergren, J. C. Park, S. Adhikari, M. Lorke, T. Fraunheim, D. -H. Choe, B. Kim, H. Choi, T. Gregorkiewicz, and Y. H. Lee, “Highly efficient carrier multiplication in van der Waals layered materials.” (2018) (arXiv).
  4. S. -Y. Seo, Jaehyun Park, Jewook Park, K. Song, S. Cha, S. Sim, S. -Y. Choi, H. W. Yeom, H. Choi, and M. -H. Jo, “Programmable Writing of Monolithic Integrated Circuits on a Two-Dimensional van der Waals Semiconductor.” (2018).



  1. S. Cha*, M. Noh*, J.-H. Kim, J. Son, H. Bae, D. Lee, H. Kim, J. Lee, H. Shin, S. Sim, S. Yang, S. Lee, W. Shim, C.-H. Lee, M.-H. Jo, J. S. Kim, D. Kim, and H. Choi, “Generation, transport, and detection of valley-locked spin photocurrent in WSe2-graphene-Bi2Se3 heterostructures,”
    Nature Nanotechnology, accepted (2018). *These authors contributed equally to this work
  2. S. Sim, D. Lee, A. V. Trifonov, T. Kim, S. Cha, J. H. Sung, S. Cho, W. Shim, M. -H. Jo, and H. Choi, “Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2,”
    Nature Communications 9, 351 (2018) (pdf).
  3. C. In, S. Sim, B. Kim, H. Bae, H. Jung, W. Jang, M. Son, J. Moon, M. Salehi, S. Y. Seo, A. Soon, M. -H. Ham, H. Lee, S. Oh, D. Kim, M. -H. Jo, and H. Choi, “Control over electron-phonon interaction by Dirac plasmon engineering in the Bi2Se3 topological insulator,”
    Nano Letters 18, 734-739 (2018) (pdf).
  4. H. Jung, J. Koo, E. Heo, B. Cho, C. In, H. Jo, J.-H. Cho, H. Choi, M.-S. Kang, and H. Lee, “Electrically controllable molecularization of terahertz meta-atoms,”
    Advanced Materials, accepted (2018).
  5. [Invited Review Article] C. In and H. Choi, “Terahertz Investigation of Dirac Materials: Graphene and Topological Insulators”
    Journal of the Korean Physical Society, accepted (2018).
  6. J. Lee*, S. Cho*, S. Park, H. Bae, M. Noh, B. Kim, C. In, S. Yang, S. Lee, S. Y. Seo, J. Kim, C. -H. Lee, W. -Y. Shim, M. -H. Jo, D. Kim, and H. Choi, “Highly efficient computer algorithm for identifying layer thickness of atomically thin two-dimensional materials,”
    Journal of Physics D: Applied Physics 51, 11LT03 (2018) (pdf). *These authors contributed equally to this work.



  1. W. Jang, J. Lee, C. In, H. Choi and A. Soon, “Designing two-dimensional Dirac heterointerfaces of few-layer graphene and tetradymite-type Sb2Te3 for thermoelectric applications,”
    ACS Appl. Mater. Interfaces 9, 42050-42057 (2017) (pdf).
  2. S. S. Chee, C. Oh, M. Son, G. C. Son, H. Jang, T. J. Yoo, S. Lee, W. Lee, J. Y. Hwang, H. Choi, B. H. Lee and M. H. Ham, “Sulfur vacancy-induced reversible doping of transition metal disulfides via hydrazine treatment,”
    Nanoscale 9, 9333-9339 (2017) (pdf).
  3. J. H. Sung*, S. Cha*, H. Heo, S. Sim, J. Kim, H. Choi, and M. H. Jo, “Ultrafast hot-carrier photovoltaics of type-I monolayer heterojunctions in the broad spectral ranges,”
    ACS Photonics 4, 429-434 (2017) (pdf). *These authors contributed equally to this work.
  4. J. Kim*, S. Park*, H. Jang, Nikesh Koirala, J. B. Lee, U. Kim, H. S. Lee, Y. G. Roh, H. Lee, S. Sim, S. Cha, C. In, J. Park, J. Lee, M. Noh, J. Moon, Maryam Salehi, J. H. Sung, S. S. Chee, M. H. Jo, S. Oh, J. H. Ahn, S. W. Hwang, D. Kim,  and H. Choi, “Highly-sensitive, gate-tunable, room-temperature mid-infrared photodetection based on graphene-Bi2Se3 heterostructure,”
    ACS Photonics 4, 482-488 (2017) (pdf).*These authors contributed equally to this work.



  1. S. Sim*, D. Lee*, M. Noh, S. Cha, C. H. Soh, J. H. Sung, M. H. Jo, and H. Choi, “Selectively tunable optical Stark effect of anisotropic excitons in atomically thin ReS2,”
    Nature Communications 7, 13569 (2016) (pdf). *These authors contributed equally to this work.
  2. W. Yu, Q. A. Vu, H. M. Oh, H. G. Nam, H. Zhou, S. Cha, J. Y. Kim, A. Carvalho, M. S. Jeong, H. Choi, A. C. Neto, Y. H. Lee, and Xi. Duan, “Unusually efficient photocurrent extraction in monolayer van der Waals heterostructure by tunneling through discretized barriers,”
    Nature Communications 7, 13278 (2016) (pdf).
  3. B. Jeong, I. Hwang, S. H. Cho, E. H. Kim, S. Cha, J. Lee, H. S. Kang, S. M. Cho, H. Choi, and C. Park, “Solvent-Assisted Gel Printing for Micropatterning Thin Organic–Inorganic Hybrid Perovskite Films,”
    ACS Nano 10, 9026–9035 (2016) (pdf).
  4. S. Sim*, J. Park*, N. Koirala, S. Lee, M. Brahlek, J. Moon, M. Salehi, J. Kim, S. Cha, J. H. Sung, M. H. Jo, S. Oh, and H. Choi†, “Composition control of plasmon-phonon interaction using topological quantum-phase transition in photoexcited (Bi1-xInx)2Se3,”
    ACS Photonics 3, 1426-1431 (2016) (pdf). *These authors contributed equally to this work.
  5. S. Cha*, J. H. Sung*, S. Sim, J. Park, H. Heo, M.-H. Jo, and H. Choi, “1s intraexcitonic dynamics in monolayer MoS2 probed by ultrafast mid-infrared spectroscopy,”
    Nature Communications 7, 10768 (2016) (pdf). *These authors contributed equally to this work.
  6. H. Jung, C. In, H. Choi, and H. Lee†, “Electromagnetically induced transparency analogue by self-complementary terahertz meta-atom,”
    Advanced Optical Materials 4627-633 (2016) (pdf).
  7. C. In*, H.-D. Kim*, B. Min, and H. Choi, “Photoinduced nonlinear mixing of terahertz dipole resonances in graphene metadevices,”
    Advanced Materials 28, 1495-1500 (2016) (pdf). *These authors contributed equally to this work.
  8. J. Park, J. G. Song, T. Choi, S. Sim, H. Choi, S. W. Han, H. B. R. Lee, S. H. Kim, H. Kim, “Comparison of hydrogen sulfide gas and sulfur powder for synthesis of molybdenum disulfide nanosheets,”
    Current Applied Physics 16691-695 (2016) (pdf).



  1. S. Sim, H. Jang, N. Koirala, M. Brahlek, J. Moon, J. H. Sung, J. Park, S. Cha, S. Oh, M.-H. Jo, J.-H. Ahn, and H. Choi, “Ultra-high modulation depth exceeding 2,400 % in the optically-controlled topological surface plasmons,”
    Nature Communications 6, 8814 (2015) (pdf).
  2. D. B. Velusamy, R. H. Kim, S. Cha, J. Huh, R. Khazaeinezhad, S. H. Kassani, G. Song, S. M. Cho, S. H. Cho, I. Hwang, J. Lee, K. Oh, H. Choi, and C. Park, “Flexible transition metal dichalcogenide nanosheets for band selective photo-detection,”
    Nature Communications 6, 8063 (2015) (pdf).
  3. J.-G. Song, G. Ryu, S.-H. Hwang, S. Sim, C. Lee, T. Choi, H. Jung, Y. Kim, Z. Lee, J.-M. Myoung, C. Dussarrat, C. Lansalot-Matras, J. Park, H. Choi, and H. Kim, “Controllable synthesis of molybdenum tungsten disulfide alloy for vertically composition-controlled multilayer,”
    Nature Communications 6, 7817 (2015) (pdf).
  4. H. Heo, J. H. Sung, S. Cha, B.-G. Jang, J.-Y. Kim, G. Jin, D. Lee, J.-H. Ahn, M. J. Lee, J. H. Shim, H. Choi, and M.-H. Jo, “Interlayer orientation dependent light absorption and emission in monolayer semiconductor stacks,”
    Nature Communications 6, 7372 (2015) (pdf).
  5. S. Sim, N. Koirala, M. Brahlek, J. H. Sung, J. Park, S. Cha, M.-H. Jo, S. Oh, and H. Choi, “Tunable Fano quantum-interference dynamics using a topological phase transition in (Bi1-xInx)2Se3,”
    Physical Review B 91, 235438 (2015) (pdf).
  6. H. Heo, J. H. Sung, G. Jin, D. Lee, J.-H. Ahn, M. J. Lee, S. Cha, H. Choi, and M.-H. Jo, “Rotation-misfit-free heteroepitaxial stacking and stitching growth of hexagonal transition-metal dichalcogenide monolayers by nucleation kinetics controls,”
    Advanced Materials 27, 3803 (2015) (pdf).
  7. C. In, J. Seo, H. Kwon, J. Choi, S. Sim, J. Kim, T. Kim, T. Lee, and H. Choi, “Counterbalanced effect of surface trap and Auger recombination on the transverse terahertz carrier dynamics in silicon nanowires,”
    IEEE Transactions on Terahertz Science and Technology 5, 605 (2015) (pdf).


  1. H. Jang*, J. Kim*, M.-S. Kim, J. H. Cho, H. Choi, J.-H. Ahn, “Observation of the inverse giant piezoresistance effect in silicon nanomembranes probed by ultrafast terahertz spectroscopy,”
    Nano Letters 14, 6942 (2014). (pdf) *These authors contributed equally to this work.
  2. M. J. Paul, B. Lee, J. L. Wardini, Z. J. Thompson, A. D. Stickel, A. Mousavian, H. Choi, E. D. Minot, and Y.-S. Lee, “Terahertz induced transparency in single-layer graphene,”
    Applied Physics Letters 105, 221107 (2014). (pdf)
  3. S. Sim, M. Brahelk, N. Koirala, S. Cha, S. Oh, H.Choi, “Ultrafast terahertz dynamics of hot Dirac-electron surface scattering in the topological insulator Bi2Se3,”
    Physical Review B 89, 165137 (2014). (pdf)
  4. H. Jung*, C. In*, H. Choi, and H. Lee, “Anisotropy modeling of terahertz metamaterials: polarization dependent resonance manipulation by meta-atom cluster,”
    Scientific Reports 4, 5217 (2014). (pdf)
  5. J. Kim, J. Oh, C. In, Y.-S. Lee, T. B. Norris, S. C. Jun, and H. Choi, “Unconventional terahertz carrier relaxation in graphene oxide: observation of enhanced Auger recombination due to defect saturation,”
    ACS Nano 8, 2486 (2014). (pdf)


  1. Y. Choi*, S. Sim*, S. J. Lim, Y. H. Lee, and H. Choi, “Ultrafast biexciton spectroscopy in semiconductor quantum dots: evidence for early emergence of multiple-exciton generation,”
    Scientific Reports 3, 3206 (2013). (pdf)
  2. S. Cha, Y. Hong, J. Yang, I. Maeng, S. J. Oh, K. Jeong, J.-S. Suh, S. Haam, Y.-M. Huh, and H. Choi, “Ultrafast spin-resolved spectroscopy reveals dominant exciton dynamics in conducting polymer polyaniline,”
    Journal of Physical Chemistry C 117, 20371 (2013). (pdf)
  3. J. Kim*, S. J. Lim*, S. J. Chae, I. Maeng, Y. Choi, S. Cha, Y. H. Lee, and H. Choi, “Ultrafast zero balance of the oscillator-strength sum rule in graphene,”
    Scientific Reports 3, 2663 (2013). (pdf) *These authors contributed equally to this work.
  4. S. Sim, J. Park, J.-G. Song, C. In, Y.-S. Lee, H. Kim, H. Choi, “Exciton dynamics in atomically thin MoS2: interexcitonic interaction and broadening kinetics,”
    Physical Review B 88, 075434 (2013). (pdf)
  5. M. J. Paul, Y.-C. Chang, Z. J. Thompson, A. Stickel, J. Wardini, H. Choi, E. D. Minot, T.B. Norris, Y.-S. Lee, “High-field terahertz response of graphene,”
    New Journal of Physics 15, 085019 (2013). (pdf)
  6. J. Choi, H. Jung, H. Lee, and H. Choi, “Electromagnetic dipole coupling mechanism in layered terahertz metamaterials,”
    Optics Express 21, 16975 (2013). (pdf)
  7. S. H. Lee*, J. Choi*, H.-D. Kim, H. Choi, and B. Min, “Ultrafast refractive index control of a terahertz graphene metamaterial,”
    Scientific Reports 3, 2135 (2013). (pdf) *These authors contributed equally to this work.
  8. J. Kim, I. Maeng, J. Jung, H. Song, J.-H. Son, K. Kim, J. Lee, C.-H. Kim, G. Chae, M. Jun, Y. Hwang, S. J. Lee, J.-M. Myoung, and H. Choi, “Terahertz time-domain measurement of non-Drude conductivity in silver nanowire thin fims for transparent electrode application,”
    Applied Physics Letters 102, 011109 (2013). (pdf)


  1. I. Maeng, S. C. Lim, S. J. Chae, Y. H. Lee, H. Choi, and J.-H. Son, “Gate-controlled nonlinear conductivity of Dirac fermion in graphene field-effect transistors measured by terahertz time-domain spectroscopy,”
    Nano Letters 12, 551 (2012). (pdf)
  2. J. L. Tomaino, A. D. Jameson, M. J. Paul, J. W. Kevek, A. M. van der Zande, R. A. Barton, H. Choi, P. L. McEuen, E. D. Minot, and Y.-S. Lee, “High-contrast imaging of graphene via time-domain terahertz spectroscopy,”
    Journal of Infrared, Millimeter, and Terahertz Waves 33, 839 (2012). (pdf)


  1. H. Choi, V.-M. Gkortsas, L. Diehl, D. Bour, S. Corzine, J. Zhu, G. Hofler, F. Capasso, F. X. Kartner, and T. B. Norris, “Ultrafast Rabi flopping and coherent pulse propagation in a quantum cascade laser,”
    Nature Photonics 4, 706 (2010). (pdf)
  2. H. Choi, F. Borondics, D. A. Siegel, S. Zhou, M. C. Martin, A. Lanzara, and R. A. Kaindl, “Broadband electromagnetic response and ultrafast terahertz dynamics of few-layer epitaxial graphene,”
    Applied Physics Letters 94, 172102 (2009). (pdf)
  3. H. Choi, L. Diehl, Z.-K. Wu, M. Giovanni, J. Faist, F. Capasso, and T. B. Norris, “Time-resolved investigations of electronic transport dynamics in quantum cascade lasers based on diagonal lasing transition,”
    IEEE Journal of Quantum Electronics 45, 307 (2009). (pdf)
  4. H. Choi, L. Diehl, Z.-K. Wu, M. Giovanni, J. Faist, F. Capasso, and T. B. Norris, “Gain recovery dynamics and photon-driven transport in quantum cascade lasers,”
    Physical Review Letters 100, 167401 (2008). (pdf)
  5. H. Choi, T. B. Norris, T. Gresch, M. Giovanni, J. Faist, L. Diehl, and F. Capasso, “Femtosecond dynamics of resonant tunneling and superlattice relaxation in quantum cascade lasers,”
    Applied Physics Letters 92, 122114 (2008). (pdf)
  6. H. Choi, L. Diehl, M. Giovannini, J. Faist, F. Capasso, T. B. Norris, “Femtosecond pump-probe studies of carrier transport and gain dynamics in quantum cascade lasers,”
    Physica Status Solidi (c) 5, 225 (2008). (pdf)
  7. H. Choi, L. Diehl, F. Capasso, D. Bour, S. Corzine, J. Zhu, G. Hofler, and T. B. Norris, “Time-domain upconversion measurements of group-velocity dispersion in quantum cascade lasers,”
    Optics Express 15, 15898 (2007). (pdf)
  8. Z.-K. Wu, H. Choi, X. Su, S. Subhananda, P. K. Bhattacharya, and T. B. Norris, “Ultrafast electronic dynamics in unipolar n-doped InGaAs/GaAs self-assembled quantum dots,”
    IEEE Journal of Quantum Electronics 43, 486 (2007). (pdf)
  9. K.-H. Lee, H. Choi, and W.-Y. Choi, “Analysis of chromatic dispersion-induced second-harmonic distortions including laser dynamics to the second order,”
    IEEE Journal of Quantum Electronics 39, 640 (2003). (pdf)