Events Archive

Condensed Matter Seminar | Senthil Todadri, MIT | "Correlations and topology in graphene moire lattices" | Joseph Henry Room, Jadwin Hall
Wed, Dec 4, 2019, 12:00 pm12:00 pm


A remarkable recent development is the discovery of correlated electronic states in twisted bilayer graphene and other moire graphene systems. In this talk I will discuss aspects of the  theory of these systems. I will show that both strong correlations and band topology are features of many graphene moire lattices. I will…
Special Condensed Matter Seminar | Han Yan, OIST, Japan, | "Universal picture of holographic toy models from Rank-2 U(1) theory (or Lifshitz gravity)" | PCTS Seminar Room 407
Thu, Nov 21, 2019, 1:30 pm1:30 pm

In this talk, we address two points connecting holographic toy models and fracton states of matter. First, we show that there is a unified picture behind different holographic toy models based on tensor-networks, bit threads, and fracton model: a web of bit threads on a hyperbolic lattice. They all capture some coarse features of the…

Condensed Matter Seminar | Andrey Chubukov, U of Minnesota "Interplay between superconductivity and non-Fermi liquid above a quantum critical point in a metal" | Joseph Henry Room, Jadwin Hall
Wed, Nov 20, 2019, 12:00 pm12:00 pm

I discuss the interplay between non-Fermi liquid behaviour and superconductivity near a quantum-critical point (QCP) in a metal. The tendencies towards superconductivity and non-Fermi liquid behaviour compete: fermionic incoherence destroys the Cooper logarithm, while superconductivity eliminates scattering at low…

Condensed Matter Seminar | Klaus Richter, University of Regensburg, Germany | "Probing the Quantum Mechanics of Many-Body Chaos" | PCTS Seminar Room 407
Mon, Sep 23, 2019, 1:15 pm1:15 pm

The dynamics and spread of quantum information in complex many-body systems is presently attracting
a lot of attention across various fields, ranging from cold atom physics via condensed quantum matter
to high energy physics and quantum gravity. This includes questions of how a quantum system thermalizes
and phenomena like…

Condensed Matter Seminar, Umesh Vazirani, EECS Berkeley, | "Computational Pseudorandomness and Susskind's Wormhole Paradox " | PCTS Seminar Room 407
Mon, Sep 9, 2019, 1:15 pm1:15 pm

 The AdS/CFT correspondence conjectures a duality between a theory of quantum gravity in Anti de Sitter space and a conformal field theory.  Susskind identified an interesting paradox in this correspondence: namely some aspects of the behavior of eternal black holes, which partition space-time into two distinct regions connected by a “wormhole”…

Condensed Matter Seminar | Andrey Gromov, Brown University | "Bimetric theory of fractional quantum Hall states" | Jadwin A08
Mon, Mar 25, 2019, 1:15 pm2:55 pm

Fractional quantum Hall (FQH) states are topologically ordered. Additionally, FQH states support a collective neutral excitation known as the Girvin-MacDonald-Platzman (GMP) mode. Certain features of this mode are independent of the microscopic details. The objective of the talk is to construct an effective theory includes both topological…

Efficient Simulation of the Dynamics in Quantum Many-Body Systems - Frank Pollmann - TUM - PCTS
Mon, Feb 11, 2019, 1:00 pm1:00 pm
Exploring the Landscape of Complex Quantum States: From New Phases of Matter to Robust Schemes for Quantum Computation - Sagar Vijay, 303 Jadwin***NEW TIME 1:30***
Wed, Feb 6, 2019, 1:30 pm1:30 pm

Abstract:  We present recent advances in our understanding of (i) exotic quantum phases of matter in three dimensions, and (ii) robust mechanisms for storing and processing quantum information, that have been enabled by new techniques to study highly-entangled quantum states.  First, we introduce  new kinds of gapped quantum phases in three…

Condensed Matter Seminar: Oskar Vafek-FSU-"Strong Coupling Phases of Partially Filled Twisted Bilayer Graphene Narrow Bands"
Mon, Feb 4, 2019, 2:00 pm3:00 pm

When the twist angle of a bilayer graphene is commensurate and near the `magic' value, there are four narrow bands near the neutrality point, each two-fold spin degenerate. These bands are separated from the rest of the bands by energy gaps.

In the first part of the talk, the method for microscopic construction of symmetry adapted…

Exploring synthetic quantum matter in superconducting circuits
Mon, Jan 21, 2019, 1:00 pm1:00 pm

Superconducting circuits have emerged as a competitive platform for quantum computation, satisfying the challenges of controllability, long coherence and strong interactions. Here we apply this toolbox to a different problem: the exploration of strongly correlated quantum materials made of microwave photons. We develop a versatile recipe that…