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CMSA Topological Seminar 10.12.22

Engineering topological phases with a superlattice potential

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

https://youtu.be/NbjuY80nWgM Topological Quantum Matter Seminar Speaker: Jennifer Cano (Stony Brook and Flatiron Institute) Title: Engineering topological phases with a superlattice potential Abstract: We propose an externally imposed superlattice potential as a platform for manipulating topological phases, which has both advantages and disadvantages compared to a moire superlattice. In the first example, we apply the superlattice […]

CMSA Colloquium 10.12.22 (1)

Complete disorder is impossible: Some topics in Ramsey theory

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

Colloquium Speaker: James Cummings,Carnegie Mellon University Title: Complete disorder is impossible: Some topics in Ramsey theory Abstract: The classical infinite Ramsey theorem states that if we colour pairs of natural numbers using two colours, there is an infinite set all of whose pairs get the same colour. This is the beginning of a rich theory, […]

CMSA Colloquium 10.19.22

The Mobility Edge of Lévy Matrices

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

Colloquium Speaker: Patrick Lopatto (Brown) Title: The Mobility Edge of Lévy Matrices Abstract: Lévy matrices are symmetric random matrices whose entry distributions lie in the domain of attraction of an alpha-stable law; such distributions have infinite variance when alpha is less than 2. Due to the ubiquity of heavy-tailed randomness, these models have been broadly […]

Symmetric Mass Generation

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

https://youtu.be/EYi-eu4ADl0 Topological Quantum Matter Seminar Speaker: Yizhuang You, UC San Diego Title: Symmetric Mass Generation Abstract: Symmetric mass generation (SMG) is a novel mechanism for massless fermions to acquire a mass via a strong-coupling non-perturbative interaction effect. In contrast to the conventional Higgs mechanism for fermion mass generation, the SMG mechanism does not condense any […]

CMSA Colloquium 10.26.22

Clique listing algorithms

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

Speaker: Virginia Vassilevska Williams (MIT) Title: Clique listing algorithms Abstract: A k-clique in a graph G is a subgraph of G on k vertices in which every pair of vertices is linked by an edge. Cliques are a natural notion of social network cohesiveness with a long history. A fundamental question, with many applications, is […]

CMSA Topological Seminar 11.2.22

Optical axion electrodynamics

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

https://youtu.be/T1x60gYry4I Topological Quantum Matter Seminar Speaker: Junyeong Ahn (Harvard) Title: Optical axion electrodynamics Abstract: Electromagnetic fields in a magneto-electric medium behave in close analogy to photons coupled to the hypothetical elementary particle, the axion. This emergent axion electrodynamics is expected to provide novel ways to detect and control material properties with electromagnetic fields. Despite having […]

CMSA Colloquium 11.02.22

Doping and inverting Mott insulators on semiconductor moire superlattices

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

https://youtu.be/-NisBM-2a2I Speaker: Liang Fu (MIT) Title: Doping and inverting Mott insulators on semiconductor moire superlattices Abstract: Semiconductor bilayer heterostructures provide a remarkable platform for simulating Hubbard models on an emergent lattice defined by moire potential minima. As a hallmark of Hubbard model physics, the Mott insulator state with local magnetic moments has been observed at […]

CMSA Topological Seminar 11.16.22

Vacuum fluctuations in cavities: breakdown of the topological protection in the integer Quantum Hall effect

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

https://youtu.be/mtheRASO2e0 Topological Quantum Matter Seminar Speaker: Jérôme Faist  (ETH Zurich) Title: Vacuum fluctuations in cavities: breakdown of the topological protection in the integer Quantum Hall effect Abstract: When a collection of electronic excitations are strongly coupled to a single mode cavity, mixed light-matter excitations called polaritons are created. The situation is especially interesting when the […]

CMSA Colloquium 11.16.22 - 2

Noether’s Learning Dynamics: Role of Symmetry Breaking in Neural Networks

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

Colloquium Speaker: Hidenori Tanaka (NTT Research at Harvard) Title: Noether’s Learning Dynamics: Role of Symmetry Breaking in Neural Networks Abstract: In nature, symmetry governs regularities, while symmetry breaking brings texture. In artificial neural networks, symmetry has been a central design principle, but the role of symmetry breaking is not well understood. Here, we develop a […]

CMSA Topological Seminar 11.23.22

Continuum field theory of graphene bilayer system

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

https://youtu.be/BIABg2zFVGE Topological Quantum Matter Seminar Speaker: Jian Kang, School of Physical Science and Technology, ShanghaiTech University, Shanghai, China Title: Continuum field theory of graphene bilayer system Abstract: The Bistritzer-MacDonald (BM) model predicted the existence of the narrow bands in the magic-angle twisted bilayer graphene (MATBG), and nowadays is a starting point for most theoretical works. […]

CMSA Topological Seminar 12.07.22

Controlling Quantum Matter with Quantum Cavity Fields

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

https://youtu.be/Ig468DbAVGs Topological Quantum Matter Seminar Speaker: Vasil Rokaj (Harvard) Title: Controlling Quantum Matter with Quantum Cavity Fields Abstract: Cavity modification of material properties and phenomena is a novel research field motivated by the advances in strong light-matter interactions . For condensed matter systems it has been demonstrated experimentally that the transport properties of 2D materials […]

02CMSA Colloquium 02.08.2023

From spin glasses to Boolean circuits lower bounds – Algorithmic barriers from the overlap gap property

CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

Speaker: David Gamarnik (MIT) Title: From spin glasses to Boolean circuits lower bounds. Algorithmic barriers from the overlap gap property Abstract: Many decision and optimization problems over random structures exhibit an apparent gap between the existentially optimal values and algorithmically achievable values. Examples include the problem of finding a largest independent set in a random graph, the problem […]