Walid Malaeb

Walid Malaeb
Faculty: ScienceDepartment: PhysicsPosition: Assistant Professor of PhysicsOffice Number: EB111 (A2 building)Phone: +961 7 985 858Ext: 3312E-mail: w.malaeb@bau.edu.lb


Dr. Walid Malaeb obtained a Ph.D. in Physics from the Department of Complexity Science and Engineering at The University of Tokyo in Sept. 2009. After that he spent around 6 years at The Institute for Solid State Physics (ISSP) at The University of Tokyo as a Project Research Scientist. Since Sept. 2015 he is an Assistant Professor of Physics at the Faculty of Science, Beirut Arab University. His research interest has been mainly focused on investigating the electronic structure of novel high-temperature superconductors especially the iron-based compounds (discovered in Japan in 2008) using the Synchrotron Radiation facilities in Japan in addition to collaborative work in USA and Germany. Currently he is extending his research at Beirut Arab University to additionally include electrical, structural, mechanical, magnetic and thermal properties of novel high-temperature superconductors and nanomaterials. He is the author and co-author of more than 20 scientific papers published in refereed journals and has joined many international conferences worldwide and delivered many invited and contributed presentations in Japan, USA, Italy, France, China, Singapore and Qatar. Dr. Malaeb has been a member of the Japan Physical Society (JPS). 

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Previous courses

Undergraduate courses:

Introductory Physics (Phys120), Classical Mechanics and Waves (Phys 341), Electronics (Phys 305), Radiation Science (Phys 311). 

Postgraduate courses:

Materials Science and Engineering (Phys 649)


Research Interests

- Studying the electrical, structural, mechanical, magnetic and thermal properties of novel high-temperature superconductors and nanomaterials at Beirut Arab University.

- Photoemission Spectroscopy studies using Synchrotron Radiation on novel high-temperature superconductors with special focus on the newly discovered iron-pnictides. These studies are done in collaboration with The University of Tokyo and Waseda University in Japan.


30- W. Malaeb, I. Kazah, R. Awad and M. Fujioka, “Mechanical properties of the iron-based superconductor SmFeAsO1-xFx”, Journal of Physics: Conference Series 869, 012042 (2017).

29- A. Srour, W. Malaeb, S. Marhaba, and R. Awad, “Thermoelectric power of (Cu0.5Tl0.5)-1223 superconducting phase added with BaSnO3 nanoparticles”, Journal of Physics: Conference Series 869, 012017 (2017).

28- A. Nakamura, T. Shimojima, T. Sonobe, K. Ishizaka, W. Malaeb et al., “Multiple-pseudogap phases in hydrogen-doped LaFeAsO system”, Physical Review B 95, 064501 (2017).

27- B. Feng, Y.-H. Chan, Y. Feng, R.-Y. Liu, M.-Y. Chou, K. Kuroda, K. Yaji, A. Harasawa, P. Moras, A. Barinov, W. Malaeb et al., “Spin Texture in Type-II Weyl Semimetal WTe2”, Physical Review B 94, 195134 (2016).

26- W. Malaeb, H. Basma, M. ME. Barakat, R. Awad, “Investigation of the mechanical properties of GdBa2Cu3O7-δ added with nano-sized ferrites ZnFe2O4 and CoFe2O4 using ultrasonic measurement”, Journal of Superconductivity and Novel Magnetism, DOI 10.1007/s10948-016-3863-x (2016).

25- M. Nakayama, Takeshi Kondo, Z. Tian, J.J. Ishikawa, M. Halim, C. Bareille, W. Malaeb et al., “Slater to Mott crossover in the metal to insulator transition of Nd2Ir2O7”, Physical Review Letters 117, 056403 (2016).

24- T. Yoshida, W. Malaeb et al., “Coexistence of a pseudogap and a superconducting gap for the high−Tc superconductor La2−x Srx CuO4 studied by angle-resolved photoemission spectroscopy”, Physical Review B 93, 014513 (2016).

23- T. Kondo, M. Nakayama, R. Chen, J.J. Ishikawa, E.-G. Moon, T. Yamamoto, Y. Ota, W. Malaeb et al., “Quadratic Fermi node in a 3D strongly correlated semimetal”, Nat. Commun. 6, 10042 (2015).

22- T. Kondo, W. Malaeb et al., “Point nodes persisting far beyond Tc in Bi2212”, Nat. Commun. 6, 7699 (2015).

21- T. Yoshida, S. Ideta, T. Shimojima, W. Malaeb et al., “Anisotropy of the superconducting gap in the iron-based superconductor BaFe2(As1-xPx)2”, Sci. Rep. 4, 7292 (2014).

20- W. Malaeb, T. Shimojima, Y. Ishida, T. Kondo et al., “Evidence of a universal relation between electron-mode coupling and Tc in Ba1-xKxFe2As2 superconductor from Laser ARPES”, Physical Review B 90, 195124 (2014).

19- S. Ideta, T. Yoshida, M. Nakajima, W. Malaeb et al., “Electronic structure of BaNi2P2 observed by ARPES”, Physical Review B 89, 195138 (2014).

18- Y. Ota, K. Okazaki , Y. Kotani, T. Shimojima, W. Malaeb et al., “Evidence for excluding the possibility of d-wave superconducting-gap symmetry in Ba-doped KFe2As2” Physical Review B 89, 081103R (2014).

17- T. Shimojima, T. Sonobe, W. Malaeb et al., “Pseudogap formation above the superconducting dome in iron pnictides” Physical Review B 89, 045101 (2014).

16- S. Ideta, T. Yoshida, M. Nakajima, W. Malaeb et al., “Effects of Zn substitution on the electronic structure of BaFe2As2 revealed by angle-resolved photoemission spectroscopy”, Physical Review B 87, 201110(R) (2013).

15- T. Kondo, Y. Nakashima, W. Malaeb et al., “Anomalous doping variation of the nodal low-energy feature of superconducting (Bi,Pb)2(Sr,La)2CuO6+crystals revealed by laser-based ARPES”, Physical Review Letters 110, 217006 (2013).

14- T. Kondo, Y. Nakashima, Y. Ota, Y. Ishida, W. Malaeb et al., “Anomalous dressing of Dirac fermions in the topological surface state of Bi2Se3, Bi2Te3, and Cu-doped Bi2Se3”, Physical Review Letters 110, 217601 (2013).

13- M. Sakano, M. S. Bahramy, A. Katayama, T. Shimojima, H. Murakawa, Y. Kaneko, W. Malaeb et al., “Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors”, Physical Review Letters 110, 107204 (2013).

12- W. Malaeb, T. Shimojima, Y. Ishida, K. Okazaki et al., “Abrupt change in the energy gap of superconducting Ba1-xKxFe2As2 single crystals with hole doping”, Physical Review B 86, 165117 (2012).

11- K. Okazaki, Y. Ota, Y. Kotani, W. Malaeb et al., “Octet-line node structure of superconducting order parameter in KFe2As2”, Science 337, 1314 (2012).

10- R. Yoshida, M. Fukui, Y. Haga, E. Yamamoto, Y. Onuki, M. Okawa, W. Malaeb et al., “Observation of two fine structures related to the hidden order in the spectral functions of URu2Si2”, Physical Review B 85, 241102(R) (2012).

9- T. Shimojima, F. Sakaguchi, K. Ishizaka, Y. Ishida, W. Malaeb et al., “Angle-resolved photoemission study on the superconducting iron-pnictides of BaFe2(As,P)2 with low energy photons”, Solid State Communications 152, 695 (2012).

8- Y. Ishida, H. Kanto, A. Kikkawa, Y. Taguchi, Y. Ito, Y. Ota, K. Okazaki, W. Malaeb et al., “Common origin of the circular-dichroism pattern in ARPES of SrTiO3 and CuxBi2Se3”, Physical Review Letters 107, 077601 (2011).

7- I. Nishi, M. Ishikado, S. Ideta, W. Malaeb et al., “ARPES study of PrFeAsO0.7: Comparison with LaFePO”, Physical Review B 84, 014504 (2011).

6- W. Malaeb, T. Yoshida, A. Fujimori et al., “Three-dimensional electronic structure of superconducting iron pnictides observed by angle-resolved photoemission spectroscopy”, Journal of the Physical Society of Japan 78, 123706 (2009). (Among JPSJ top 20 most downloaded articles in Dec. 2009).

5- W. Malaeb, T. Yoshida, T. Kataoka et al., “Electronic structure and electron correlation in LaFeAsO1-xFx and LaFePO1-xFx”, Journal of the Physical Society of Japan 77, 093714 (2008). (Among JPSJ top 20 most downloaded articles in Sept. 2008 in collaboration with Y. Kamihara and H. Hosono, the discoverers of high-temperature superconductivity in iron-based compounds in 2008. H. Hosono was named by Thomson Reuters as a candidate for the 2013 Noble Prize in physics: http://thomsonreuters.com/press-releases/092013/nobel-laureates)

4- R. Awad, A.I. Abou-Aly, S. Isber, W. Malaeb, “Investigation of specific heat and thermopower properties of Tl-1223 substituted by sodium”, Solid State Communications 145, 201 (2008).

3- W. Malaeb, T. Yoshida, T. Kataoka et al., “Photoemission study of the electronic structure of LaFeAsO1-xFx and LaFePO1-xFx”, Journal of the Physical Society of Japan 77 (2008): Proceedings of the Intl. Symposium on Fe-Pnictide Superconductors.

2- W. Malaeb, T. Yoshida, M. Hashimoto et al., “Temperature dependence of the chemical potential in La2-xSrxCuO4”, Journal of Physics: Conference Series 108, 012018 (2008).

1- R. Awad, A.I. Abou-Aly, S. Isber, W. Malaeb, “Effect of the partial replacement of Ca by alkaline element Na on Tl-1223 superconductor”, Journal of Physics: Conference Series 43, 474 (2006).

Selected Presentations

Presenting at many international conferences and workshops including invited talks in Japan, USA, France, Italy, China, Singapore, Qatar and Lebanon in addition to the periodically held Japan Physical Society meetings. Few selected talks are listed below:

1- International conference on Strongly Correlated Electron Systems (SCES17), Prague, Czech Republic, July 17th – 21st / 2017: https://sces2017.org/

2- Frontiers in Theoretical and Applied Physics (FTAPS 2017), The American University of Sharjah, United Arab Emirates, February 21st – 25th/ 2017: https://www.aus.edu/ftaps2017

3- 5th international conference on superconductivity and novel Magnetism, Fethiye- Turkey, April 24th-30th/2016: http://icsm2016.org/

4- International Conference on Strongly Correlated Electron Systems (SCES), Grenoble-France, July 6th-11th/2014: http://www.sces2014.org/

5- Brookhaven National Lab seminar, Long Island-New York, Sept. 9th/2013 (invited): http://www.bnl.gov/ps/events/

6- International workshop on Recent developments in Fe-based high-temperature superconductors, Riverhead New York, Sept. 3rd-6th/2013 (invited): http://www.bnl.gov/fhs2013/

7- International Conference on Materials and Mechanisms of Superconductivity (M2S), Washington D.C., July 29th-Aug 3rd/2012: http://www.m2s-2012.org/washington-dc/

8- Qatar Foundation special seminar, Doha-Qatar, Oct.11th/2011 (invited): http://www.qscience.com/doi/abs/10.5339/qfarf.2012.AESNP21

9- 9th International Conference on Materials and Mechanisms of Superconductivity, Tokyo, Japan, Sept. 7th-12th/2009.

10- Nanyang Technological University – University of Tokyo joint symposium, Singapore, Feb. 2009.

11- A3 workshop, Joint Research on Novel Properties of Complex Oxides, Shanghai, China, Dec. 7th- 8th/2008: http://www.physics.fudan.edu.cn/tps/people/dlfeng/Eng/A3/A3program.html

12- International Conference on FeAs High Tc Superconducting Multilayers and Related Phenomena, Roma-Italy, Dec. 9-13/2008 (invited): http://www.roma1.infn.it/stripes/Menu/006Conferences/SuperStripes08/SuperStr08home.html


- Contributing effectively to the undergoing process towards accreditation of the physics program at BAU.

- Member of several committees at BAU.


- Japanese government full scholarship (Monbusho) for Ph.D. study between 2006 and 2009.

- BAU full scholarship for undergraduate study between 2000 and 2002.

- The Jamal Abdel Nasser Award for Scientific Distinction from BAU in 2002.