Seminars & literature chats of the group “Nonequilibrium Many-Body Systems”

every working Monday, 11:15, Karl-Freiherr-von-Fritsch Str. 3, Room 1.0.1.0

April 10

Michael Kraus

seminar/chat

April 17

holiday

-

April 24

PD Georg Lefkidis

guest

May 1

holiday

-

May 8

Dr. Ryan Requist

guest

May 15

Conrad Schuster

seminar/chat

May 22

Carlos Granados

seminar/chat

May 29

Anna Dyrdal

seminar/chat

June 5

holiday

-

June 12

Dominik Schulze

seminar/chat

June 19

Mario Goncalves-Marques

seminar/chat

June 26

Björn Niedzielski

seminar/chat

July 3

Alexander Schäffer

seminar/chat

July 10

Chenglong Jia

seminar/chat

July 17

Carlos Benavides

seminar/chat

July 24

-

-

July 31

Levan Chotorlishvili

seminar/chat

August 7

Stefan Stagraczyński

seminar/chat

August 14

Jonas Wätzel

seminar/chat

 

PD Georg Lefkidis

Condensed Matter Theory Group, Kaiserlautern University of Technology

lefkidis@physik.uni-kl.de

 

Magnetism and quantum thermodynamics in strongly correlated

molecular system

 

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

at 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], and then proceed by presenting our work regarding nano-Otto

[2,3] and nano-Diesel cycles [4] based on molecular nanomagnets. Among others, I will

show why the dimensionality of thermodynamic diagrams in non-equilibrium quantum

systems must be increased, and I will indicate the special connection between

thermodynamic and magnetic properties. Furthermore, I will discuss non-homogeneous

temperature distributions leading to the spin Seebeck effect [5], and finally I will address

some new concepts regarding the mapping of fully correlational quantum-chemical

calculations to spin Hamiltonians for finite systems.

 

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

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

[3]    W. Hübner, G. Lefkidis, C. D. Dong, D. Chaudhuri, L. Chotorlishvili,

and J. Berakdar, Phys. Rev. B 90, 024401 (2014)

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

[5]    G. Lefkidis and S. A. Reyes, Phys. Rev. B 94, 144433 (2016)

_____________________________________________________________

 

Dr. Ryan Requist

Max-Planck-Institut für Mikrostrukturphysik, Halle (Saale)

ryan.requist@mpi-halle.mpg.de

 

TBA