Barbaros Özyilmaz

Professor, Department of Physics

Email:phyob@nus.edu.sg
Contact:(65) 6516 2111
Office:S13 #02-10
Official Website

Biography:

Dr Barbaros Ozyilmaz is an experimental physicist specializing in the newly emerging fields of spintronics and carbon-based nanotechnology. He was, until recently, a postdoctoral research scientist at Columbia University. Since December 2007, he has joined the Physics Department at NUS as an Assistant Professor. Currently he is is a Professor at the Department of Physics.

 

Dr Ozyilmaz grew up in Aachen, a small city in Germany at the border with both the Netherlands and Belgium. He attended college in his hometown at the University of Aachen with a year spent at the University of Manchester, England. His research career started with an 18-month stay for his “Diplomarbeit” (Masters) at the European High Magnetic Field laboratory in Grenoble, France in 1998. After graduation, he went to the US for his Ph.D. at New York University. Here, together with IBM scientists, he worked on the fundamental properties of spin currents across nanometer scale ferromagnets. His Ph.D. work has helped clarify many fundamental questions and resulted in a number of highly cited publications. This work has also resulted in a number of licensed patents in the data storage industry.

 

After a short post-doctoral stint in 2004 in Germany, Dr Ozyilmaz returned to New York and joined Professor Philip Kim’s group at the Physics Department at Columbia University at the beginning of 2005. Here, he become part of the pioneering experiments on graphene, a recently discovered near perfect two dimensional crystal, in which electrons behave as if they have no mass. They studied the unique behavior of such relativistic electrons and demonstrated for the first time the potential of this material for the semiconductor industry. Graphene is particularly attractive for nanoelectronics because it has the potential for industrial production of complex nanoscale devices.

 

At NUS, Dr Ozyilmaz plans to build a strong interdisciplinary research group which will merge the two major thrusts of his research into a new field of grapheme-based spintronics. He believes this approach will enable him to compete with the world’s leading research institutions. His research is driven both by scientific curiosity as well as the firm belief that the “new” physics revealed by fundamental studies will have a large impact on future technologies. For example, reducing the dimensions of material systems reveals not only novel phenomena but also provides insight into new operating principles and systems with strongly enhanced functionalities. This process has great potential for device applications and is of fundamental interest for the microelectronics industry. Therefore, it is not surprising that many of the key players in this field of research are industrial giants such as IBM, MOTOROLA, SAMSUNG and INTEL. In Singapore, this research will provide a bridge between the academic world where most discoveries are made and the high tech industry where these discoveries can be utilized for faster, better, cheaper and more energy efficient microelectronic device applications.

Research Areas:

My research area is experimental condensed matter physics. The two major thrusts of my research are charge and spin transport in lithographically patterned graphene nanostructures and the manipulation of the magnetization of nanoscale ferromagnets by means of spin currents. I am interested in both the fundamental properties of such systems and their potential applications in the fields of nano-electronics and nano-spintronics. While both systems are intriguing in their own right, merging them into a hybrid device allows one to take advantage of their mutually exclusive but complementary properties. Graphene is particularly attractive for nano-electronics and spintronics because it has the potential for wafer size, simple, planar fabrication of complex nanoscale high mobility devices. Equally important graphene offers thermal and chemical stability on the nanometer size range

1. Spin transport and spin transfer torque in nanoscale magnets 
2. Fabrication of graphene nanostructures 
3. Graphene based “relativistic” device applications 
4. Charge and spin transport properties of graphene

Research Interest:

Spin transport and spin transfer torque in nanoscale magnets
Charge, spin and heat transport properties of nanoscale graphene devices
Applications of graphene in the areas of data storage, data processing, flexible electronics, spintronics, displays, touch panels, batteries, supercapacitors and tissue engineering

Selected Publications:

2013

  1. Colossal Enhancement of Spin-Orbit Coupling in Weakly Hydrogenated Graphene;
    Balakrishnan, J., Koon, G. K. W., Jaiswal, M., Castro Neto, A. H., Özyilmaz, B.
    Nature Physics, Accepted. (2013).
  2. Graphene-P(VDF-TrFE) multilayer film for flexible applications;
    Bae, S.-H., Kahya, O., Sharma, B. K., Kwon, J. G., Cho, H. J., Özyilmaz, B., Ahn, J.-H.
    ACS Nano, Accepted. doi: 10.1021/nn400848j (2013).
  3. An innovative way of etching MoS2: Characterization and mechanistic investigation;
    Huang, Y., Wu , J., Xu, X., Ho, Y., Ni, G. X., Zou, Q., Koon, G. K. W., Zhao, W., Castro Neto, A. H., Eda, G., Shen, C., Özyilmaz, B.
    Nano Research, Accepted. doi: 10.1007/s12274-013-0296-8 (2013).
  4. Property Control of Graphene by Employing "Semi-Ionic" Liquid Fluorination;
    Lee, J. H., Koon, G. K. W., Shin, D. W., Fedorov, V. E., Choi, J.-Y., Yoo, J.-B. and Özyilmaz, B. 
    Adv. Funct. Mater., Accepted. doi: 10.1002/adfm.201202822 (2013).
  5. Spin Pumping in Permalloy/Graphene and Permalloy/Graphite Interfaces;
    S. Singh, A. K. Patra, B. Barin, E. del Barco1, and B. Özyilmaz
    IEEE Transactions on Magnetics, Accepted (2013).

2012

  1. Localized insulator-conductor transformation of graphene oxide thin films via focused laser beam irradiation;
    Tao, Y., Varghese, B., Jaiswal, M., Wang, S., Zhang, Z., Özyilmaz, B., Loh, K.P., Tok, E.S., Sow, C.H.
    Applied Physics A: Materials Science and Processing, 106 (3), pp 523-531 (2012).
  2. Dynamic spin injection into chemical vapor deposited graphene;
    A. K. Patra, S. Singh, B. Barin, Y. Lee, J.-H. Ahn, E. del Barco, E. R. Mucciolo, and B. Özyilmaz
    Applied Physics Letters 101, 162407 (2012).
  3. Assembly of suspended graphene on carbon nanotube scaffolds with improved functionalities;
    Sharon Xiaodai Lim, Gavin Kok Wai Koon, Da Zhan, Zexiang Shen, B. Özyilmaz, Chornghaur Sow
    Nano Research, 1998-0124 (2012).
  4. Graphene–Ferroelectric Hybrid Structure for Flexible Transparent Electrodes;
    G.-X. Ni, Y. Zheng, S. Bae, C.Y. Tan, O. Kahya, J. Wu, B.H. Hong, K. Yao, B. Özyilmaz
    ACS Nano, 6 (5), pp 3935–3942 (2012).
  5. Quasi-Periodic Nanoripples in Graphene Grown by Chemical Vapor Deposition and Its Impact on Charge Transport;
    G.-X. Ni, Y. Zheng, S. Bae, H.R. Kim, A. Pachoud, Y.S. Kim, C.-L. Tan, D. Im, J.-H. Ahn, B.H. Hong, B. Özyilmaz
    ACS Nano, 6 (2), pp 1158–1164 (2012).
  6. Electronic Properties of Nanodiamond Decorated Graphene;
    Y. Wang, M. Jaiswal, M. Lin, S. Saha, B. Özyilmaz, K.P. Loh
    ACS Nano, 6 (2), pp 1018–1025 (2012).