NYU Arts & Science
All Scheduled Events
July 19, 2018 Thursday 9:00 AM  +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Tidal Disruption Meeting
Tidal Disruption Meeting



July 19, 2018 Thursday 1:00 PM  +
726 Broadway, 902, Lg Conf
Other CCPP (ccpp)

Group Meeting
Blanton, Tinker, Pullen



July 19, 2018 Thursday 1:00 PM  +
726 Broadway, 940, CCPP Seminar
Other CCPP (ccpp)

Other
Flatiron Institute
Flatiron Institute



July 20, 2018 Friday 9:00 AM  +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Tidal Disruption Meeting
Tidal Disruption Meeting



July 20, 2018 Friday 9:00 AM  +
726 Broadway, 940, CCPP Seminar
Other CCPP (ccpp)

Flatiron Institute
Flatiron Institute
Flatiron Institute



July 20, 2018 Friday 11:00 AM  +
726 Broadway, 902, Lg Conf
Other CCPP (ccpp)

Flatiron event
Rachel Somerville & Greg Bryan
Flatiron Institute

summer program



July 24, 2018 Tuesday 2:00 PM  +
726 Broadway, 902, Lg Conf
Other CCPP (ccpp)

Astroparticle Group Meet
Astro Particle Group Mtg



July 26, 2018 Thursday 11:00 AM  +
726 Broadway Room 1067
CQP Seminars (cqp)


Yassine Quessab
University of Lorraine, Nancy (France)

Mechanism and size effects of helicity-dependent all-optical magnetization switching

The manipulation of the magnetization with ultrashort laser pulses is a promising method to achieve ultrafast and ultrahigh density magnetic recording [1]. Deterministic magnetization reversal induced by circularly polarized light was demonstrated in multiple ferri- and ferro-magnetic metallic materials [2,3]. This phenomenon is called helicity-dependent all-optical switching (HD-AOS). In ferromagnets, HD-AOS is a two-step cumulative and multishot process consisting of: a helicityindependent demagnetization followed by a helicity-dependent magnetization recovery [4]. Yet, the microscopic mechanism of the remagnetization remains highly debated. In this talk, I will present my recent works on the laser-induced magnetization switching in ferromagnetic Co/Pt multilayers. First, I will discuss the reversal mechanism of AOS. To investigate a potential switching process through domain nucleation and domain wall (DW) propagation, we studied the response of a DW upon femto- or pico-second laser irradiation in Co/Pt thin films that exhibit HD-AOS. We report helicity-dependent all-optical DW motion. We demonstrate that it results from the balance of three contributions: the temperature gradient due to the laser heating, the helicity effect and the pinning effects. By measuring the magnetic circular dichroism, a purely thermal mechanism of the laserinduced DW motion appears to be excluded. Second, we examine the size effects in AOS in Co/Pt films patterned into microdots with a diameter between 10 and 3 μm. This allows us to explore the role of the dipolar field in the switching mechanism. We evidence that a larger number of laser pulses is required to reverse the magnetization of a microdot compared to the continuous film. This indicates that the dipolar field eases the magnetization reversal in the full film. Our experimental results give insight into the underlying mechanism of AOS and its potential integration in high density magnetic data storage devices. [1] Stanciu et al., Phys. Rev. Lett. 99, 047601 (2007) [2] Mangin et al., Nat. Mat. 13, 286–292 (2014) [3] Lambert et al., Science 345, 1337 (2014) [4] El Hadri et al., Phys. Rev. B. 94, 184406 (2016)


July 26, 2018 Thursday 1:00 PM  +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Group Meeting
Blanton, Tinker, Pullen



July 31, 2018 Tuesday 11:00 AM  +
726 Broadway, Room 1067, CQP Conference Room
Condensed Matter Physics Seminars (cmp)


Luqiao Liu
MIT

Magnetic Memories with Topological Insulator and Compensated Ferrimagnet

New materials and physics mechanisms are required to further lower down the power consumption and increase the switching speed of magnetic memory devices. In this talk, I will focus on two novel material systems which can provide new opportunities for magnetic switching. First of all, I will discuss our recent study on compensated ferrimagnetic alloys which have antiferromagnetically coupled sublattices, low magnetic moment and fast switching dynamics. Particularly, I will show that efficient electrical reading and writing can be realized in those thin films with zero magnetic moment[1, 2]. Moreover, via studying the current induced domain wall motion, we demonstrate the speed advantage associated with those materials [3]. Secondly, topological insulators has spin momentum locked surface states. In our experiment, we observe current induced magnetic switchings in topological insulator/magnet bilayer films at room temperature. The large spin torque efficiency makes topological insulators outstanding candidates for realizing power efficient magnetic switching devices [4]. References: [1] J. Finley, et al, Physical Review Applied, 6, 054001 (2016) [2] J. Finley, et al, Spin orbit torque switching in compensated Heulser Alloy, submitted (2018) [3] S. Siddiqui, et al, Current-induced domain wall motion in compensated ferrimagnet, submitted (2018) [4] J. Han, et al, Physical Review Letters, 119, 077702 (2017)


July 31, 2018 Tuesday 2:00 PM  +
726 Broadway, 902, Lg Conf
Other CCPP (ccpp)

Astroparticle Group Meet
Astro Particle Group Mtg



August 2, 2018 Thursday 1:00 PM  +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Group Meeting
Blanton, Tinker, Pullen



August 3, 2018 Friday 11:00 AM  +
726 Broadway, 940, CCPP Seminar
Other CCPP (ccpp)

Informal Astro Talk
Sanjaykumar Patil
University of Melbourne

Weighing the giants with CMB lensing

Galaxy clusters are the largest virialized objects in the Universe, and are powerful probes of cosmology. Their abundance as a function of mass and redshift is extremely sensitive to how structures grow and the properties of dark energy. Though they are powerful probes of cosmology, they are currently limited by mass uncertainty which is ~ 15%. One way to measure cluster mass is through lensing of the cosmic microwave background (CMB). CMB-cluster lensing offers a robust and accurate way to constrain galaxy cluster masses, especially at high redshift (z > 1) where optical lensing measurements are challenging. With CMB lensing we expect to improve mass uncertainty to 3% for upcoming experiments such as AdVACT, SPT-3G etc., and to 1% for next generation CMB experiments. In this talk, I will report on a demonstration of this technique using CMB data from the South Pole Telescope (SPT) to constrain masses of the Dark Energy Survey (DES) galaxy cluster catalog.


August 7, 2018 Tuesday 2:00 PM  +
726 Broadway, 902, Lg Conf
Other CCPP (ccpp)

Astroparticle Group Meet
Astro Particle Group Mtg



August 9, 2018 Thursday 1:00 PM  +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Group Meeting
Blanton, Tinker, Pullen



August 14, 2018 Tuesday 2:00 PM  +
726 Broadway, 902, Lg Conf
Other CCPP (ccpp)

Astroparticle Group Meet
Astro Particle Group Mtg



August 16, 2018 Thursday 1:00 PM  +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Group Meeting
Blanton, Tinker, Pullen



August 21, 2018 Tuesday 2:00 PM  +
726 Broadway, 902, Lg Conf
Other CCPP (ccpp)

Astroparticle Group Meet
Astro Particle Group Mtg



August 23, 2018 Thursday 1:00 PM  +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Group Meeting
Blanton, Tinker, Pullen



August 28, 2018 Tuesday 2:00 PM  +
726 Broadway, 902, Lg Conf
Other CCPP (ccpp)

Astroparticle Group Meet
Astro Particle Group Mtg



August 30, 2018 Thursday 1:00 PM  +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Group Meeting
Blanton, Tinker, Pullen



September 4, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


Smadar Naoz
UCLA

TBA

TBA


September 11, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


Perley Perley
LJMU

TBA

TBA


September 12, 2018 Wednesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
High Energy Physics Seminars (hep)


Yu-tin Huang
National Taiwan University



September 12, 2018 Wednesday 3:00 PM  +
726 Broadway, room 871
Soft Condensed Matter Seminars (csmr)


David Saintillan
UCSD

TBA



September 18, 2018 Tuesday 11:00 AM  +
726 Broadway Room 1067
Condensed Matter Physics Seminars (cmp)


Maria Tamargo
The City College of New York

TBD



September 18, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


Neelima Sehgal
Stony Brook

TBA

TBA


September 25, 2018 Tuesday 11:00 AM  +
726 Broadway Room 1067
Condensed Matter Physics Seminars (cmp)


Jennifer Cano
Princeton University

TBD



September 25, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


Savvas Koushiappas
Brown University

TBA

TBA


October 2, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


Jeremiah Murphy
FSU

TBA

TBA


October 9, 2018 Tuesday 11:00 AM  +
726 Broadway Room 1067
Condensed Matter Physics Seminars (cmp)


Hugh Churchill
University of Arkansas

TBD



October 9, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


Elisa Chisari
Oxford University

TBA

TBA


October 10, 2018 Wednesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
High Energy Physics Seminars (hep)


Jacob Sonnenschein
Tel Aviv University



October 16, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


TBD TBD
TBD

TBD

TBD


October 17, 2018 Wednesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
High Energy Physics Seminars (hep)


Jesse Thaler
MIT

tba



October 23, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


Matteo Cantiello
Flatiron Institute

TBD

TBD


October 30, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


Kate Alexander
Harvard University

TBD

TBD


October 31, 2018 Wednesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
High Energy Physics Seminars (hep)


Chris Hull
Imperial College London



November 6, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


TBA TBA
TBA

TBA

TBA


November 13, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


Tristan Smith
Swarthmore College

TBA

TBA


November 16, 2018 Friday 3:00 PM  +
AMNH, TBA
Other CCPP (ccpp)

Big Apple Colloquium
Amina Helmi
Kapteyn Institute, Groningen

TBD

TBD


November 20, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


TBA TBA
TBA

TBA

TBA


November 27, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


Jo Dunkley
Princeton

TBA

TBA


December 4, 2018 Tuesday 12:00 PM  +
726 Broadway, 940, CCPP Seminar
High Energy Physics Seminars (hep)


Alex Maloney
McGill University



December 4, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


Ravi Sheth
University of Pennsylvania

TBA

TBA


December 11, 2018 Tuesday 2:00 PM  +
726 Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars (astro)


TBA TBA
TBA

TBA

TBA


December 12, 2018 Wednesday 12:00 PM  +
726 Broadway, 940, CCPP Seminar
Other CCPP (ccpp)

Pierre Hohenberg Seminar
Charles Kane
University of Pennsylvania

TBA

TBA Please note that time is not exact. More details to come. Location not specified but will likely be in CCPP Seminar room, 940.