Publications

 Two distinct surface terminations of SrVO3 (001) ultrathin films as an influential factor on metallicity

H. Oka, Y. Okada, T. Hitosugi, and T. Fukumura

 (submitted)

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Disorder induced power-law gaps in an Insulator-Metal Mott transition

Z. Wang, Y. Okada, J. O’ Neal, W. Zhou, D. Walkup, C. Dhital, T. Hogan, P. Clancy,

Y. J. Kim, Y. F. Hu, L. Santos, S. D. Wilson, N, Trivedi and V. Madhavan

PNAS (accepted)

 

Anisotropic Band Splitting in Monolayer NbSe2: Implications for Superconductivity and Charge Density Wave

Y. Nakata, K. Sugawara, S. Ichinokura, Y. Okada, T. Hitosugi, T. Koretsune, K. Ueno, S. Hasegawa, T. Takahashi, and T. Sato,

npj 2D Materials and Applicationsvolume 2, 12 (2018)

 

 

Atomic-scale visualization of oxide thin-film surfaces


K. Iwaya, T. Ohsawa, R. Shimizu, Y. Okada, and T. Hitosugi

Sci Technol Adv Mater. 19(1): 282–290 (2018).

 

 

 

 

 

 

 

Scanning tunneling spectroscopy of superconductivity on surfaces of LiTi2O4(111) thin films

Y. Okada, Y. Ando, R. Shimizu, E. Minamitani, S. Shiraki, S. Watanabe, and T. Hitosugi

Nature Communications 8, 15975 (2017)

 

 

 

Quasiparticle interference on cubic perovskite oxide surfaces

Y. Okada, T. R. Chang, G. Chang, R. Shimizu, H. T. Jeng, S. Shiraki, A. Bansil, H. Lin, T. Hitosugi

Phys. Rev. Lett. 119, 086801 (2017)

 

 

 

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Monolayer 1T-NbSe2 as a Mott insulator

Y. Nakata, K. Sugawara, R. Shimizu, Y. Okada, P. Han, T. Hitosugi, K. Ueno, T. Sato, and T. Takahashi

NPG Asia Materials 8, e321 (2016)

 

 

 

Nanoscale determination of the mass enhancement factor in the lightly doped bulk insulator ​lead selenide

I. Zeljkovic, K. L. Scipioni, D. Walkup, Y. Okada, Wenwen Zhou, R. Sankar, G. Chang,Y. J. Wang, H. Lin, A. Bansil, F. Chou, Z. Wang and V. Madhavan

Nature Communication 6, 6559-6563 (2015)

 

 

 

 

Dirac mass generation from crystal symmetry breaking on the surfaces of topological crystalline insulators

I. Zeljkovic★, Y. Okada★, C. Y. Huang, R. Sankar, D. Walkup, W. Zhou, M. Serbyn, F. Chou, W. F. Tsai, H. Lin, A. Bansil, L. Fu, M. Z. Hasan, V. Madhavan

Nature Materials 14, 318–324 (2015)

 

 

 

Mapping the unconventional orbital texture in topological crystalline insulators

I. Zeljkovic★, Yoshinori Okada★, C. Y. Huang, R. Sankar, D. Walkup, W. Zhou, M. Serbyn, F. Chou, W. F. Tsai, H. Lin, A. Bansil, L. Fu, M. Z. Hasan, V. Madhavan

Nature Physics 10, 572-577 (2014)

 

 

 

 

Electronic phase separation in the doped spin-orbit driven Mott phase of Sr3(Ir1-xRux)2O7

C. Dhital, T. Hogan, W. Zhou, X. Chen, Z. Ren, M. Pokharel, Yoshinori Okada, M. Heine, W Tian, Z. Yamani, C. Opeil, J. S. Helton, J. W. Lynn, Z. Wang, V. Madhavan, S. D. Wilson

Nature Communications 5, 3377 (2014)

 

 

 

Observation of Dirac node formation and mass acquisition in a topological crystalline insulator

Yoshinori Okada, M. Serbyn, H. Lin, D. Walkup, W. Zhou, C. Dhital, M. Neupane, S. Xu, Y. J. Wang, R. Sankar, F. Chou, A. Bansil, Z. Hasan, S. D. Wilson, L. Fu and Vidya Madhavan

Science 341, 1496-1499 (2013)

 

 

 

Topological insulators: Plasmons at the surface

Yoshinori Okada, Vidya Madhavan

 Nature Nanotechnologies 8, 541-542 (2013)

 

 

 

Topological dangling bonds with large spin splitting on the surfaces of Bi2Se3

Hsin Lin, T. Das, Y. Okada, M. C. Boyer, W. D. Wise, M. Tomasik, B. Zhen, E. Hudson, W. Zhou, V. Madhavan, C. Y. Ren, H. Ikuta, and A. Bansil1

Nano Letters, 13, 1915–1919. (2013)

 

 

 

Imaging the evolution of metallic states in a spin-orbit interaction driven correlated iridate

Y. Okada, D. Walkup, H. Lin, C. Dhital, T. R. Chang, S. Khadka, W. Zhou, H. T. Jeng, A. Bansil, Z. Wang, S. Wilson, V. Madhavan

 Nature Materials 12, 707-713 (2013)

 

 

 

 

Ripple modulated electronic structure of a 3D topological insulator

Y. Okada, W. Zhou, D. Walkup, C. Dhital, S. D. Wilson, V. Madhavan

 Nature Communications 3, 1158 (6 pages) (2012)

 

 

 

 

Visualizing Landau levels of Dirac electrons in a one dimensional potential

Y. Okada, Wenwen Zhou, Chetan. Dhital, D. Walkup, Ying Ran, Z. Wang, Stephen D. Wilson, V. Madhavan

 Phys. Rev. Lett. 109, 166407 (2012)

 

 

 

 

Direct Observation of Broken Time-Reversal Symmetry on the Surface of a Magnetically Doped Topological Insulator

Y. Okada, C. Dhital, W. Zhou, E. D. Huemiller, H. Lin, S. Basak, A. Bansil, Y. -B. Huang, H. Ding, Z. Wang, S. D. Wilson, and V. Madhavan

Phys. Rev. Lett. 106, 206805-206808 (2011)

 

 

 

 

Three energy- and temperature-scales corresponding to competing pseudogap state, incoherent-, and coherent-superconductivity in high-Tc cuprates

Y. Okada, T. Kawaguchi, M. Ohkawa, K. Ishizaka, T. Takeuchi, S. Shin, and H. Ikuta

Phys. Rev. B 83, 104502-104507 (2011).

 

 

 

Enhancement of superconducting fluctuation under the coexistence of a competing pseudogap state in Bi2Sr2-xRxCuOy

Y. Okada, Y. Kuzuya, T. Kawaguchi, and H. Ikuta

Phys. Rev. B 81, 214520-214524 (2010).

 

 

 

 

Origin of the anomalously strong influence of out-of-plane disorder on high-Tc superconductivity

Y. Okada, T. Takeuchi, T. Baba, S. Shin, and H. Ikuta

Journal of Phys. Soc. Japan 77, 074714-074717 (2008).