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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Displaying all lectures given by: Sung-Sik Lee


PIRSA:18060027  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Emergent Gravity From Relatively Local Hamiltonians
Speaker(s): Sung-Sik Lee
Abstract:
Date: 18/06/2018 - 9:30 am

PIRSA:16120009  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Low energy field theories for non-Fermi liquids
Speaker(s): Sung-Sik Lee
Abstract:  Non-Fermi liquids are exotic metallic states which do not support well defined quasiparticles. Due to strong quantum fluctuations and the presence of extensive gapless modes near the Fermi surface, it has been difficult to understand universal low energy properties of non-Fermi liquids rel... read more
Date: 07/12/2016 - 2:00 pm
Series: Colloquium

PIRSA:15070061  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Anisotropic Non-Fermi Liquids
Speaker(s): Sung-Sik Lee
Abstract: We study non-Fermi liquids that arise at the quantum critical points associated with the spin and charge density wave transitions in metals with the C2 symmetry. We use the dimensional regularization scheme, where a one-dimensional Fermi surface is embedded in 3 − epsilon dimensional momentum spac... read more
Date: 10/07/2015 - 10:00 am

PIRSA:15040162  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Low energy field theories for non-Fermi liquids
Speaker(s): Sung-Sik Lee
Abstract: In this talk, I will discuss some of the recent progress made on low energy effective field theories for non-Fermi liquids. Based on a dimensional regularization scheme, physical properties of various non-Fermi liquid states can be computed in controlled ways. I will emphasize novel features that ar... read more
Date: 30/04/2015 - 3:00 pm

PIRSA:14010100  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Low energy effective theories for non-Fermi liquids
Speaker(s): Sung-Sik Lee
Abstract: In this talk, I will discuss about examples of non-Fermi liquids which can be understood in controlled manners. The first example is based on a dimensional regularization scheme, where the co-dimension of Fermi surface is extended such that the Yukawa coupling between a critical boson and Fermi surf... read more
Date: 10/01/2014 - 11:00 am

PIRSA:13050036  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Quantum renormalization group and AdS/CFT
Speaker(s): Sung-Sik Lee
Abstract: In this talk, I will discuss about the notion of quantum renormalization group, and explain how (D+1)-dimensional gravitational theories naturally emerge as dual descriptions for D-dimensional quantum field theories. It will be argued that the dynamical gravitational field in the bulk encodes the en... read more
Date: 08/05/2013 - 11:00 am

PIRSA:12060028  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
From Quantum Field Theory to Quantum Gravity
Speaker(s): Sung-Sik Lee
Abstract: TBA
Date: 08/06/2012 - 2:00 pm

PIRSA:12050033  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Background Independent Holographic Description : From Matrix Field Theory to Quantum Gravity
Speaker(s): Sung-Sik Lee
Abstract: A local renormalization group procedure is proposed where length scale is changed in spacetime dependent manner. Combining this scheme with an earlier observation that high energy modes in renormalization group play the role of dynamical sources for low energy modes at each scale, we provide a presc... read more
Date: 22/05/2012 - 2:00 pm

PIRSA:11100095  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
First Principle Construction of Holographic Duals
Speaker(s): Sung-Sik Lee
Abstract: Topological Quantum field theories(TQFTs) are a special class of QFTs. Their actions do not depend on the metric of the background space-time manifold. Thus, it is very natural to define TQFTs on an arbitrary triangulation of the space-time manifold and they are independent on the triangulation. Mor... read more
Date: 25/10/2011 - 11:30 am

PIRSA:11100057  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Quantum Order and Emergent Space in Holographic Phases of Matter
Speaker(s): Sung-Sik Lee
Abstract: In this talk, I will present a first principle construction of a holographic dual for gauged matrix models. The dual theory is a closed string field theory coupled with an emergent two-form gauge field defined in one higher dimensional space. The bulk space with an extra dimension emerges as a well ... read more
Date: 18/10/2011 - 2:00 pm

PIRSA:10050087  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Holographic description of quantum field theory
Speaker(s): Sung-Sik Lee
Abstract: The AdS/CFT correspondence has opened the door to understand a class of strongly coupled quantum field theories. Although the original correspondence has been conjectured based on string theory, it is possible that the underlying principle is more general, and a wider class of quantum field theories... read more
Date: 29/05/2010 - 9:45 am

PIRSA:08120018  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Emergent supersymmetry and holographic non-Fermi liquid
Speaker(s): Sung-Sik Lee
Abstract: Understanding dynamics of strongly coupled quantum field theories is an important problem in both condensed matter physics and high energy physics. In condensed matter systems, interacting quantum field theories can arise either at a critical point, or in a finite region of a parameter space. In the... read more
Date: 03/12/2008 - 9:30 am

PIRSA:07040033  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Spin Liquid with Spinon Fermi Surface: Its Stability and Possible Application to the Organics
Speaker(s): Sung-Sik Lee
Abstract: Based on a U(1) gauge theory of the Hubbard model on the triangular lattice, it is argued that a spin liquid phase may exist near the Mott transition in the organic compound κ-(BEDT-TTF)2Cu2(CN)3. In the spin liquid state, low energy excitations are fermionic spinons and an emergent U(1) gauge boso... read more
Date: 24/04/2008 - 5:00 pm

PIRSA:06030004  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Dual gravity study of the (2+1)D compact U(1) gauge theory coupled with strongly interacting matter fields
Speaker(s): Sung-Sik Lee
Abstract: Strongly correlated many-body systems are often formulated as gauge theories where gauge field plays a role of Lagrangian multiplier and fundamental matter field represents a fractional degree of freedom which carries only a fractional quantum number of microscopic particle. Although the fractional ... read more
Date: 06/03/2006 - 2:00 pm
Series: Colloquium
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