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  1. Theory and Models

Theory and Models

Quantum many body problems

are encountered when quantum particles interact. The many-body wavefunction then turns to a complicated object to study when it responses to external fields. In addition, disorder is ubiquitous in real world and may strongly impact the physics at play.

Polarons and transport in organic semiconductors

The great challenge is the sizable electron-phonon coupling in these systems which need to be addressed non-perturbatively. Here I developed a transport theory in the past and my group is elaborating improvements and applies it to various interesting systems. The connection to a full first-principles parameterization makes it specific.
Further reading: Phys. Rev. B 2009, New. J. Phys. 2010, Phys. Stat. Sol B 2011, Adv. Funct. Mater 2015, J. Am. Chem. Soc. 2017 

Spin physics and spin coherence

Here we are looking into the electron’s spin degree of freedom. Long spin coherence times are essential for any kind of spintronic application and possible relaxation mechanisms are studied.
Further reading: Phys. Rev. Lett. 2012, Nature Phys. 2014, 2D Mater. 2015, Sci. Rep. 2016

Non-equilibrium dynamics and localization

Transport phenomena at different lenghscales and timescales are under investigation here. Multiple quantum interferences are important when studying weak-localization/weak antilocalization phenomena.
Further reading: EPL 2011, Phys. Rev. Lett. 2013, Phys. Rev. B 2011