Marcus Lassila, Physics and Astronomy

​Title on Master thesis: Holographic Duality and Strongly Interacting Quantum Matter


This thesis is devoted to the applications of holographic duality to condensed matter physics. It
is centered around a ’bottom-up’ approach where the starting point is the postulation of a reasonable
gravitational bulk theory action, as opposed to the ’top-down’ models where a specific duality is derived
from a string theory setting. The main advantage with the holographic approach to condensed matter
physics is the potential ability to perform computations for strongly interacting many-body systems
which does not have a quasiparticle description. The duality maps a strongly coupled quantum field
theory to a weakly interacting gravitational theory which in principle can be solved perturabtively using
ordinary general relativity. An introduction to some of the main topics of ’bottom-up’ holography is
covered. This includes a brief introduction to large N field theories, the AdS/CFT correspondance, the
holographic dictionary, the holographic renormalization group, holographic thermodynamics, and the
Hawking-page transition and its interpretation in the light of AdS/CFT. Finally, a minimal bottom-up
model for holographic superconductivity is studied. By imposing a mixed boundary condition at the
boundary of AdS space, a dynamical photon is incorporated in the strongly coupled superconductor.
This allows charged collective excitations, e.g. plasmons, to be studied. A linear response analysis of
the minimal holographic superconductor is performed numerically in an attempt to compute plasmon
dispersion relations.​
​Supervisor and E​xaminer: Ulf Gran
Opponent: David Schörling

Category Student project presentation
Location: N6115, seminar room, Kemigården 1, Fysik Origo
Starts: 21 February, 2020, 09:00
Ends: 21 February, 2020, 10:00

Published: Tue 04 Feb 2020.