**Thursday, October 27, 2016**

Hamilton Colloquium Series

“The Search for Quantum Anomalous Hall Insulators”

Location: Jadwin Hall, Room A10

Time: 4:30 PM

Speaker(s): David Vanderbilt, Rutgers University**Description:**The quantum Hall effect, discovered 35 years ago, is a bizarre phenomenon in which a 2D gapped system can nevertheless carry a current. Moreover, the transverse conductivity of the system is precisely quantized in units of e^2/h. Unfortunately, this behavior requires a strong perpendicular magnetic field, and has only been observed at low temperatures. Work of Haldane in 1988 raised the possibility that similar physics could be observed in two-dimensional magnetic systems without any external magnetic field, and potentially at much higher temperatures. Such a system is known as a “quantum anomalous Hall” (QAH) or “Chern” insulator.

In this talk I will introduce the essential physics of the QAH effect, provide a tutorial on its mathematical description in terms of Berry phases, and briefly describe recent successes in finding low-temperature realizations. I will then review some of our own recent work in which we propose the deposition of atoms with strong spin-orbit interactions onto the surfaces of magnetic insulators as a promising route toward the synthesis of higher-temperature QAH systems.

**Friday, October 28, 2016**

High Energy Theory Seminar

“Projective Geometry of Scattering Amplitudes”

Location: Bloomberg Hall Physics Library

Time: 1:45 PM

Speaker(s): Ellis Ye Yuan, Member, School of Natural Sciences, IAS**Description:**I will introduce a technique in studying the analytic structure of perturbative S-matrix of QFTs. The main idea is to associate Feynman integrals to objects in a projective space: polytopes and hypersurfaces. At one loop, this reveals a universal structure for all possible Feynman integrals (in particular, including one-loop amplitudes in any QFTs), and gives rise to two simple algebraic algorithms to determine the integrals (as functions of the kinematics). I will also comment on the generalization to higher loop levels.

**Monday, October 31, 2016**

High Energy Theory Seminar

“A 1d Topological Sector of 3d SCFTs from Supersymmetric Localization”

Location: Bloomberg Lecture Hall

Time: 2:30 PM

Speaker(s): Silviu Pufu, Princeton University**Description:**3d {\cal N} = 4 SCFTs have two protected topological sectors, one associated to the Higgs branch and one to the Coulomb branch. I will use supersymmetric localization to derive a Lagrangian description for the 1d sector associated with the Higgs branch, in the case in which the 3d SCFT has a UV Lagrangian description involving vector multiplets and hypermultiplets. The 1d Lagrangian is that of a topological gauged quantum mechanics. This 1d theory can be used to calculate n-point correlation functions of certain linear combinations of Higgs branch operators in the SCFT, and in particular it can be used to calculate the structure constants of the Higgs branch operator algebra.

**Friday, November 4, 2016**

High Energy Theory Seminar

“TBA”

Location: Bloomberg Hall Physics Library

Time: 1:45 PM

Speaker(s): Xi Dong, Member, School of Natural Sciences, IAS

**Monday, November 7, 2016**

High Energy Theory Seminar

“Towards Finding All Elliptically Fibered Calabi-Yau Threefolds”

Location: Jadwin Hall, PCTS Seminar Room, 4th Floor

Time: 2:30 PM

Speaker(s): Daniel S. Park, Rutgers University**Description:**I will review the efforts made towards approaching string universality in six dimensions and report recent "cartographic" developments on exploring the landscape of six-dimensional string vacua. A working conjecture is that all six-dimensional string vacua can be constructed in F-theory, which leads to the problem of classifying all elliptically fibered Calabi-Yau threefolds. I will present progress on classifying all the four-manifolds that can be used as a base of such threefolds.

**Tuesday, November 8, 2016**

Pheno & Vino Seminar

“TBA”

Location: Jadwin Hall, Room 303

Time: 4:00 PM

Speaker(s): Gordon Krnjaic, Perimeter Institute

**Wednesday, November 9, 2016**

Physics Group Meeting

“TBA”

Location: Bloomberg Hall Physics Library

Time: 1:45 PM

Speaker(s): Matt Reece, Harvard University

**Thursday, November 10, 2016**

Hamilton Colloquium Series

“TBA”

Location: Jadwin Hall, Room A10

Time: 4:00 PM

Speaker(s): Neal Weiner, New York University

**Friday, November 11, 2016**

High Energy Theory Seminar

“TBA”

Location: Jadwin Hall, Room A06

Time: 1:45 PM

Speaker(s): Thomas Mertens, Princeton University

**Monday, November 14, 2016**

High Energy Theory Seminar

“TBA”

Location: Bloomberg Lecture Hall

Time: 2:30 PM

Speaker(s): Senthil Todadri, Massachusetts Institute of Technology

**Tuesday, November 15, 2016**

Pheno & Vino Seminar

“TBA”

Location: Jadwin Hall, Room 303

Time: 4:30 PM

Speaker(s): David Pinner, Princeton University

**Friday, November 18, 2016**

High Energy Theory Seminar

“TBA”

Location: Bloomberg Hall Physics Library

Time: 1:45 PM

Speaker(s): TBA, TBA

**Monday, November 21, 2016**

High Energy Theory Seminar

“TBA”

Location: Jadwin Hall, PCTS Seminar Room, 4th Floor

Time: 2:30 PM

Speaker(s): Bogdan Stoica, Brandeis University

**Monday, November 28, 2016**

High Energy Theory Seminar

“TBA”

Location: Bloomberg Lecture Hall

Time: 2:30 PM

Speaker(s): Jaume Gomis, Perimeter Institute

**Tuesday, November 29, 2016**

Pheno & Vino Seminar

“TBA”

Location: Jadwin Hall, Room 303

Time: 4:00 PM

Speaker(s): Francis-Yan Cyr-Racine, Harvard University

**Wednesday, November 30, 2016**

Physics Group Meeting

“TBA”

Location: Bloomberg Hall Physics Library

Time: 1:45 PM

Speaker(s): TBA, TBA

**Tuesday, December 6, 2016**

Pheno & Vino Seminar

“TBA”

Location: Jadwin Hall, Room 303

Time: 4:00 PM

Speaker(s): Eder Izaguirre, Perimeter Institute

**Friday, December 9, 2016**

High Energy Theory Seminar

“TBA”

Location: Bloomberg Hall Physics Library

Time: 1:45 PM

Speaker(s): TBA, TBA

**Monday, December 12, 2016**

High Energy Theory Seminar

“TBA”

Location: Bloomberg Lecture Hall

Time: 2:30 PM

Speaker(s): Anton Kapustin, California Institute of Technology

**Thursday, December 15, 2016**

Hamilton Colloquium Series

“TBA”

Location: Jadwin Hall, Room A10

Time: 4:30 PM

Speaker(s): Christopher Monroe, University of Maryland