Events Calendar

 February 2023        
MondayTuesdayWednesdayThursdayFriday
30
Andrei Gruzinov, Statistical Mechanics of Star Clusters? (12:30 PM - 1:30 PM)

31
, Astro Journal Club (12:30 PM - 1:30 PM)

Sasha Tchekhovskoy, Simulating Black Hole Feasts, Burps, Fireworks, and Gravitational Waves (2:00 PM - 3:15 PM)

+ Abstract:

1
, HEP Journal Club (12:30 PM - 1:30 PM)

Ibrahima Bah, Topological stars in gravity (2:00 PM - 3:00 PM)

+ Abstract:

2
Kota Katsumi, Collective Excitations in Quantum Materials Probed by Light: The Higgs Mode in Superconductors (10:00 AM - 12:00 PM)

-- Abstract: In many physical systems with spontaneously broken symmetry, collective excitations of the amplitude and phase of an order parameter emerge. In the vacuum of space-time, we are familiar with the Higgs boson, which is the amplitude mode of the Higgs field. The Higgs field gives mass to many particles via the Higgs mechanism in the standard model. In the case of superconductors, the phase mode of the superconducting order parameter, i.e., the Nambu-Goldstone mode, is absorbed by the gauge field due to the Anderson-Higgs mechanism, while the order parameter’s amplitude mode, namely the Higgs mode, remains intact. Observing the Higgs mode in superconductors has been challenging because it does not couple to electromagnetic fields linearly. Recent developments in generating intense electromagnetic pulses in the terahertz (THz) frequency range have enabled the observation of the Higgs mode in a conventional s-wave superconductor through its nonlinear coupling to the electromagnetic field [1]. Its extension to unconventional d-wave superconductors is intriguing, whereas it has been nontrivial whether the Higgs mode in d-wave superconductors is observable or not. In this colloquium, I will highlight the study of the Higgs mode in d-wave cuprate superconductors. First, the observation of the Higgs mode in cuprate superconductors using ultrafast THz pump-probe spectroscopy will be presented [2]. I will also introduce the novel applications of collective excitations, including the Higgs mode, to investigate the enigmatic superconducting order parameter of high-temperature cuprate superconductors in equilibrium [3] and out of equilibrium [4]. Finally, I will discuss future research in collective excitations in various quantum materials. [1] R. Shimano and N. Tsuji, Annu. Rev. Condens. Matter Phys. 11, 103 (2020) [2] K. Katsumi et al., Phys. Rev. Lett. 120, 117001 (2018) [3] K. Katsumi et al., Phys. Rev. B 102, 054510 (2020) [4] K. Katsumi et al., arXiv:2209.01633 (2022)

Robert Cava, Working at the boundary where Solid State Chemistry, Mineralogy and Materials Science Meet Materials Physics (4:00 PM - 5:30 PM)

+ Abstract:

3
6
Oren Slone, Dark sectors, kinetic theory, and astrophysical probes (12:30 PM - 1:30 PM)

, Grad Pheno Journal Club (2:00 PM - 3:00 PM)

7
, Astro Journal Club (12:30 PM - 1:30 PM)

Eli Waxman, Strong NIR emission following a long duration GRB: Neutron Star merger or Dust sublimation? (2:00 PM - 3:15 PM)

+ Abstract:

8
, HEP Journal Club (12:30 PM - 1:30 PM)

Kim Berghaus, The Cosmology of Dark Energy Radiation (2:00 PM - 3:00 PM)

+ Abstract:

9
, Equity & Inclusion Committee (12:30 PM - 2:00 PM)

Eli Waxman, ULTRASAT: Revolutionizing Our Understanding of the Hot Transient Universe (4:00 PM - 5:30 PM)

+ Abstract:

10
Zare (3:30 PM - 5:30 PM)

13
Sultan Hassan, Bridging the Gap between Cosmic Dawn and Reionization favors Faint Galaxies-dominated Models (12:30 PM - 1:30 PM)

14
, Astro Journal Club (12:30 PM - 1:30 PM)

Lam Hui, Black hole perturbation theory: Love numbers and nonlinear ring-down (2:00 PM - 3:15 PM)

+ Abstract:

15
, HEP Journal Club (12:30 PM - 1:30 PM)

Alberto Nicolis, Cosmology as a weak gravitational field and the trans-Planckian problem (2:00 PM - 3:00 PM)

+ Abstract:

16
, Equity & Inclusion Committee (12:30 PM - 2:00 PM)

David Spergel, CMB as a Probe of Astrophysics and the Early Universe (4:00 PM - 5:15 PM)

+ Abstract:

17
Aishwarya Kumar, Hybrid Quantum Science with Neutral Atoms in Superconducting Resonators (10:00 AM - 12:00 PM)

+ Abstract:

Zare (3:30 PM - 5:30 PM)

20
, President's Day - University Closed

(12:30 PM - 1:30 PM)

21
, Astro Journal Club (12:30 PM - 1:30 PM)

Tomer Yavetz, Stream Fanning and Bifurcations: Observing Fundamental Dynamics in Stellar Stream Morphology (2:00 PM - 3:00 PM)

+ Abstract:

22
, HEP Journal Club (12:30 PM - 1:30 PM)

(2:00 PM - 3:15 PM)

23
(10:30 AM - 11:30 AM)

, Equity & Inclusion Committee (12:30 PM - 2:00 PM)

Gil Refael, Floquet Engineering in the Era of Topological Physics and Quantum Coherent Devices (4:00 PM - 5:30 PM)

+ Abstract:

24
Zare (3:30 PM - 5:30 PM)

27
Xucheng Gan, Millicharged Relics Reveal Massless Dark Photons (12:30 PM - 1:30 PM)

+ Abstract:

28
, Astro Journal Club (12:30 PM - 1:30 PM)

, No Astro Seminar (2:00 PM - 3:15 PM)

1
, HEP Journal Club (12:30 PM - 1:30 PM)

Joaquin Turiaci, Black hole spin-statistics (2:00 PM - 3:00 PM)

+ Abstract:

2
, Equity & Inclusion Committee (12:30 PM - 2:00 PM)

Arvind Murugan, Learning without Neurons (4:00 PM - 5:30 PM)

+ Abstract:

3
Zare (3:30 PM - 5:30 PM)