Physics and Astronomy Colloquia

*Fall/Winter/Spring Quarter Colloquia Starts at 4:00 pm*

Title: On Ising's model of ferromagnetism

Speaker:Peter Armitage, Johns Hopkins University

Abstract: The 1D Ising model is a classical model of great historical significance for both classical and quantum statistical mechanics. Developments in the understanding of the Ising model have fundamentally impacted our knowledge of thermodynamics, critical phenomena, magnetism, conformal quantum field theories, particle physics, and emergence in many-body systems. Despite the theoretical impact of the Ising model there have been very few good 1D realizations of it in actual real material systems. However, it has been pointed out recently, that the material CoNb2O6, has a number of features that may make it the most ideal realization we have of the Ising model in one dimension. In this talk I will discuss the surprisingly complex physics resulting in this simple model and review the history of "Ising’s model” from both a scientific and human perspective. In the modern context I will review recent experiments by my group and others on CoNb2O6. In particular I will show how low frequency light in the THz range gives unique insight into the tremendous zoo of phenomena arising in this simple material system.

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Keywords: Physics, Astronomy, colloquium


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Subir Sachdev: Strange metals and black holes

April 27, 2018, 4:00 PM - 5:00 PM

Title: Strange metals and black holes

Speaker:Subir Sachdev, Harvard University 

Abstract: 

A `strange metal’ is a new state of matter, formed by electrons in many modern
materials. In this state, the electrons quantum entangle with each other across long distances, and conduct electric current collectively (rather than one-by-one, as in an ordinary metal like copper). As they are cooled, most strange metals also become superconductors at relatively high temperatures, in which electric current flows with zero resistance.

Black holes are stars so dense that even light is not able to escape their gravitational attraction. Remarkably, there is a mapping between the quantum theories of these very different physical systems: strange metals and black holes. I will illustrate this equivalence with a very simple model of a strange metal, which can also be viewed as a theory of primitive black hole.

 

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Keywords: Physics, Astronomy, colloquium


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Ryan Chornock : TBA

May 4, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Ryan Chornock, Ohio University 

Abstract: TBA

Host: Tchekhovskoy

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Keywords: Physics, Astronomy, colloquium


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Elisabetta Matsumoto: TBA

May 11, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker: Elisabetta Matsumoto, Georgia Institute of Technology

Abstract: TBA

Host: Tchekhovskoy

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Keywords: Physics, Astronomy, colloquium


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Leslie Rogers: TBA

May 18, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Leslie Rogers, University of Chicago

Abstract: TBA

Host: Tchekhovskoy

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Keywords: Physics, Astronomy, colloquium


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Brad Cenko: TBA

May 25, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Brad Cenko, NASA

Abstract: TBA

Host: Tchekhovskoy

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Keywords: Physics, Astronomy, colloquium


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Eugene Stanley: TBA

June 1, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Eugene Stanley, Boston University 

Abstract: TBA

Host: Motter

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Keywords: Physics, Astronomy, colloquium


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Ana Maria Rey: TBA

September 28, 2018, 4:00 PM - 5:00 PM

Title: 

Speaker:Ana Maria Rey, University of Colorado-Boulder

Abstract: 

Host: 

Speaker Schedule

Keywords: Physics, Astronomy, colloquium