报告题目：Quantum thermodynamic processes and magnetism in strongly correlated molecules

报  告 人：Dr. Georgios Lefkidis（德国凯泽斯劳滕工业大学）

报告时间：2016年9月23日（星期五），上午10:30

报告地点：威廉希尔六层学术报告厅（致知楼3623-3624）

报告摘要：

As magnetic molecular systems become increasingly more important both for theory and experiment, temperature starts to play a very important role. The reason for this is that future technological nano-spintronics applications, will (most probably) have to function in room temperature in order to reach the market. Further from simply taking this additional degree of freedom into account one can also think of harvesting it by means of nano heat engines.

In this talk I will start by introducing some fundamental temperature concepts applicable in quantum systems [1-4], and then proceed by presenting our recent work regarding nano-Otto [5,6] and nano-Diesel cycles [7] based on molecular nanomagnets. Among others I will show why the dimensionality of thermodynamic diagrams must be increased in non-equilibrium quantum systems, and I will indicate the special connection between thermodynamic and magnetic properties.

References:

[1]    H.T. Quan, Y.-X. Liu, C.P. Sun, and F. Nori, Phys. Rev. B 76, 031105 (2007)

[2]    G. Lefkidis and W. Hübner, Phys. Rev. B 74, 155106 (2006)

[3]    G. Lefkidis and W. Hübner, J. Magn. Magn. Mat. 321, 979 (2009)

[4]    C. Li, T. Hartenstein, G. Lefkidis and W. Hübner, Phys. Rev. B 79, 180431(R) (2009)

[5]    C.D. Dong, G. Lefkidis, and W. Hübner, J. Supercond. Nov. Magn. 26, 1589 (2013)

[6]    W. Hübner, G. Lefkidis, C.D. Dong, D. Chaudhuri, L. Chotorlishvili, and J. Berakdar, Phys. Rev. B 90, 024401 (2014)

[7]    C.D. Dong, G. Lefkidis, and W. Hübner, Phys. Rev. B 88, 214421 (2013)

报告人简介：

Dr. Georgios Lefkidis received his M.S degree and doctoral degree in Aristotle University Thessaloniki in 1995 and 2002, respectively. From 2003, he worked in Kaiserslautern University of Technology as a Post-doctoral researcher for four years. Currently he is a tenured lecturer in TU Kaiserslautern and a visiting professor in Northwestern Polytechnical University. His main research fields are electronic ab-initio theory of nonlinear optics and magnetooptics in (anti)ferromagnets, laser-induced spin and charge dynamics, quantum thermodynamics, and logic functionalization of magnetic nanostructures for logic units and spintronics devices. Till now he has contributed 49 peer reviewed publications (PRL, Nature Physics, PRB et al.), 1 book chapter, and 27 invited talks. Also, he is a referee for several journals (e.g., American Physical Society and Physica Status Solidi).

欢迎广大师生参加！

威廉希尔

2016年9月20日