Holographic descriptions of collective modes in strongly correlated media
Licentiatavhandling, 2019

Solving the puzzle of high temperature superconductivity may be one of the most desired scientific breakthroughs of our time, as access to room temperature superconductivity could revolutionize society as we know it. In this thesis, we strive to increase the theoretical understanding of such matter, by studying the phase above, in temperature, the superconducting phase - the "strange metal".

The strange metal phase is a phase characterized by the absence of a quasi-particle description. The electrons in this phase are strongly coupled, which means that conventional methods, such as perturbation theory in quantum field theory and Monte Carlo methods fall short of being able to describe their dynamics. Perhaps surprisingly, string theory provides a different method, capable of describing precisely such systems - the holographic duality.

Whereas there has been significant effort devoted to the applications of the duality since its inception in 1997, and even more so in the last decade after it was observed that it worked remarkably well for condensed matter theory, it wasn't until our project that the dynamical polarization of such strongly coupled systems where properly treated.

In this thesis, we introduce the minimal constraints required for a sensible description of a polarizing medium, and convert those to boundary conditions to the equations of motion provided by the holographic dual. These boundary conditions deviate from previous holographic studies, and we contrast the quasinormal modes previously studied with the emergent collective modes we find for some different models.

We find novel results, as well as confirm the predictions of less general models in their respective regions of validity and pave the way for more complex future models.

plasmonics

strong coupling

graphene

strongly correlated media

gauge/gravity duality

holography

quasinormal modes

PJ-salen, Fysikgården 2B, Fysik Origo
Opponent: Prof. Mats Granath, Department of Physics, University of Gothenburg, Sweden

Författare

Marcus Tornsö

Chalmers, Fysik, Teoretisk fysik

Holographic response of electron clouds

Journal of High Energy Physics,; (2019)

Artikel i vetenskaplig tidskrift

Exotic holographic dispersion

Journal of High Energy Physics,; Vol. 2019(2019)

Artikel i vetenskaplig tidskrift

Holographic plasmons

Journal of High Energy Physics,; (2018)

Artikel i vetenskaplig tidskrift

Gran, U, Tornsö, M, Zingg, T. Plasmons in Holographic Graphene

Tillämpad strängteori - holografiska metoder för starkt kopplade system

Vetenskapsrådet (VR), 2016-01-01 -- 2019-12-31.

Ämneskategorier

Subatomär fysik

Fysik

Atom- och molekylfysik och optik

Den kondenserade materiens fysik

Fundament

Grundläggande vetenskaper

Utgivare

Chalmers tekniska högskola

PJ-salen, Fysikgården 2B, Fysik Origo

Opponent: Prof. Mats Granath, Department of Physics, University of Gothenburg, Sweden

Mer information

Skapat

2019-08-27