Venue: Interesting Physics of Atomic Wires and Layers

Speaker: Professor Dr. Han Woong Yeom, Phys. Department, POSTECH, Korea

Time: 11 November 2011,16:00-17:00

Location: Room 201, Academic Building 12, Yuquan Campus

Abstract:

 Tailoring materials in atomic scale is definitely the ever-lasting dream for all materials scientists. While there are various approaches towards such ultimate control over materials, we are interested in single atomic layers or single atomic wires fabricated on solid surfaces through self-organization process.

In particular, we have investigated metallic atomic wires and layers on silicon substrates where the prototypical physics of low-dimensional electrons can be studied. For metallic atomic wire systems, which are the thinnest conducting wires on earth, we have discovered a series of metal-insulator transitions into charge density wave ground states. I will also discuss how we can control further the physical properties of atomic wires by introducing impurity atoms. The challenges and opportunities in the electron physics of such extreme materials systems will be presented.

Biography:

Education;

●　Department of Physics, Seoul National University, Korea (1985 ~ 1989); B.S. in physics.

● Department of Physics, POSTECH, Korea (1989~ 1991); M.S. in experimental solid state physics.

● Department of Physics, Faculty of Science, Tohoku University, Japan (1994~1996) ; Doctor of Science in physics.

Employment;

● Research Associate, Research Center for Spectrochemistry, Faculty of Science, the University of Tokyo and beam line manager (BL-7A and BL-7B) of Photon Factory, KEK (1996 ~1999)

● Guest Researcher, Department of Physics and Measurement Technology, Linköping University, Sweden (1997).

● Lecturer, Department of Applied Chemistry, School of Engineering, the University of Tokyo (1999 ~ 2000)

● Assistant Professor, Institute of Physics and Applied Physics, Yonsei University (2000 ~ 2004)

● Associate Professor, Department of Physics, Yonsei University (2004 ~ 2009)

● Professor, Department of Physics, Yonsei University (2009 ~ 2010)

● Director, Center for Atomic Wires and Layers, Yonsei University (2003 ~ now)

● Professor, Department of Physics, POSTECH (2010 ~ now)

Awards and honors;

● JSPS Foreign Student Fellowship, Japanese Society for Promotion of Science (1993-1996)

● Young Researcher of the Year, Japanese Society for Synchrotron Radiation Research (1999)

● Outstanding Faculty of the Year, Yonsei University (2006)

● Scientist and Engineer of the Month, Ministry of Science and Technology of Korea (2006)

● Academic Achievement Award, Korean Physical Society (2007)

● Honored Invitation as Scientist of Asia, Japanese Society for Applied Physics (2007)

● Outstanding Referee (Lifetime honor), American Physical Society (2010)

Major Research Interests and achievements;

● Techniques; Electron spectroscopy using soft X-ray/UV synchrotron radiation and scanning

tunneling microcopy/spectroscopy

●　Subjects; Semiconductor surfaces, interfaces, and nanostructures ; in particular,

electronic properties of novel atomic- or nano-scale structures on semiconductor surfaces

● Achievements;

(1) Discovering a series of Peierls-type metal-insulator transitions of atomic wires formed on silicon surfaces (PRL 1999, 2003, 2005) to establish the field of physics of self assembled atomic wires

(2) Establishing the doping technique on metallic atomic wires formed on silicon surfaces (PRL 2008, PRB 2010)

(3) Unveiling the initial oxidation and nitridation mechanism of silicon surfaces (PRL 2000, 2003)

(4) Establishing the surface electronic structures of cubic SiC(001) surfaces (PRB 1997, PRL 2000)

(5) Discovering interfacial Dirac electron systems in the metal/semiconductor interface (PRL 2010)

(6) Establishing the existence of band structures, the radial band structure, for liquid metals (PRL 2011)

Publication and citation summary;

145 SCI publications including 24 Phys. Rev. Lett. papers

2800 citations with H-index 30

References

[1] H. W. Yeom et al., Phys. Rev. Lett. 82, 4898 (1999).

[2] J. R. Ahn, H. W. Yeom, H. S. Yoon, and I.-W. Lyo, Phys. Rev. Lett. 91, 196403 (2003).

[3] J. R. Ahn, P. G. Kang, K. D. Ryang, and H. W. Yeom, Phys. Rev. Lett. 95, 196402 (2005).

[4] K. S. Kim, H. Morikawa, W. H. Choi, and H. W. Yeom, Phys. Rev. Lett. 99, 196804 (2007).

[5] W. H. Choi, P. G. Kang, K. D. Ryang, and H. W. Yeom, Phys. Rev. Lett. 100, 126801 (2008).

[6] K. S. Kim and H. W. Yeom, Nano Lett. 9, 1916 (2009).

[7] K. S. Kim, S. C. Jung, M. H. Kang and H. W. Yeom, Phys. Rev. Lett.  (2010).