Department Calendar

Monday, April 17, 2017

Time Items
All day
 
2pm
"Large field inflation from the top down"

"Large field inflation from the top down"

Date: 
Mon, 04/17/2017 - 2:10pm
Location: 
Pupin Hall Theory Center, 8th floor

Please join us on Monday, April 17, 2017, as Marjorie Schillo of KU Leuven gives her talk.

"Large field inflation from the top down"

I will present recent work that has succeeded in embedding a novel theory for large field inflation - Unwinding Inflation - in string theory. I will review Unwinding Inflation and discuss how the process of brane-flux annihilation, in which D-branes lower flux numbers and therefore the 4D vacuum energy, can be used to embed this model in string theory. This mechanism has recently been extended such that many units of flux can be discharged in a “flux cascade.” The flux cascade can be used to substantially reduce vacuum energy and give rise to 60 efolds of inflation.  The role of the inflaton is played by the position of a brane moving many times over a compact internal dimension and can naturally achieve super-Planckian field excursions.

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04/17/2017 - 2:10pm
 
4pm
"From Mott Physics to Topology"

"From Mott Physics to Topology"

Date: 
Mon, 04/17/2017 - 4:15pm
Location: 
428 Pupin Hall

Alessandra Lanzara

Physics Department, University California, Berkeley

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley

"From Mott Physics to Topology"

Two types of interactions commonly drive new emergent phenomena beyond textbook band theory in quantum materials: electron correlation and spin orbit coupling. The first, born from the observation of Mott that strong electron correlation can drive a system, otherwise metallic, on the verge of being an insulator, has excited the condensed matter community over the past several decades and lies at the core of many unsolved phenomena, such as unconventional superconductivity. The second, derives from the relativistic correction to the hydrogen-like atom, and has been vastly explored in the previous decades in the context of Rashba effect. Recently, the realization that strong spin orbit coupling can induce dramatic effect on the band structure of weakly interacting systems driving new phases of matter such as the topological band insulators has sparked huge interest in this emerging field. The real frontier today is to understand whether strongly interacting systems can exhibit any type of intrinsic topological order, distinct from band topology in insulators and what consequences this might have.

In this talk I will present experimental results for a variety of materials spanning the entire range of interaction, from strong correlation (Mott insulators), to strong spin orbit coupling (topological insulators) and intermediate interaction regime (spin orbit coupled Mott insulators). I will present intriguing results on the interplay between these two interactions and how, even in the most extreme case they can give rise to unexpected topological like features. The future of the field is discussed.

About the speaker

Alessandra Lanzara is a Professor of Physics at University of California, Berkeley and a Faculty Scientist at the Lawrence Berkeley National Laboratory. She received her B.S and PhD in physics from Universita' di Roma La Sapienza, Italy in 1999. She was a post-doctoral Researcher at Stanford University from 1999-2002. In 2002 she joined the physics Department faculty at UC Berkeley as Assistant Professor and since 2011 she is a Full Professor. She is also a Faculty Scientist at the Materials Sciences Division of the Lawrence Berkeley National Laboratory since 2002. Prof. Lanzara is one of the board members of the Far West Section of the American Physical Society; serves as a Panel member of the Linar Coherent Light Source at Stanford; as an Advisory Member of the "Scientific Council of the Rome International Center for Material Science"; and as a board member of the Photon Science Advisory Committee of the Paul Scherer Institute in Switzerland. She is also serving on the board of a few prestigious scientific journals.

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04/17/2017 - 4:15pm
 
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