Q(uantum) Club seminar series aim to bring together researchers in the NYC area to discuss their latest research and recent works on quantum physics, quantum phenomena, and quantum technology in an informal setting. Each talk is given by a student or postdoc and is aimed to build a research network among the younger generation and promote collaborations. The talks are open to everyone and location will alternate between NYU and Columbia. Please pass this email to your students and postdocs.

If you have any questions regarding the seminar or like to nominate/volunteer a speaker, please contact us.

For NYU events, you need to sign up simply by sending me your first/last name and your institution. We will compile the list so you can enter the building.

Third Meeting: Tuesday 24th 2018

Location: Flatiron Institute

162 Fifth Avenue, 9th Floor Classroom

New York, NY 10010

Room: 9th floor

12-12:30 pizza lunch

12:30-1:30pm seminar

Speaker: Alex Kerelsky, Columbia University

Title: Intrinsic Long-Range Magnetism in Semiconducting Transition Metal Dichalcogenides

The search has been ongoing for several decades for dilute magnetic semiconductors, materials with a semiconducting bandgap and long range magnetic interaction, the combination of which makes them ideal for spintronic applications. The transition metal dichalcogenides have also been of great interest in recent years as they can be isolated to monolayers, like graphene, and have an intrinsic direct bandgap in the optical wavelength making them great 2D semiconductors for electronic and optical applications. To date, however, magnetism in the semiconducting transition metal dichalcogenides is not well studied as the pristine lattices are not predicted to exhibit magnetism. In this talk, we report the direct experimental observation of magnetism below TM=40K and TM=100K in bulk 2H-MoTe2 and 2H-MoSe2 respectively by muon spin relaxation/rotation (µSR), as well as a weaker magnetic order onsetting at higher temperatures. From atomic-resolution scanning tunneling microscopy (STM), we show that as-grown transition metal dichalcogenide bulk crystals have naturally occurring, uniform distributions of a multitude of defects native to the transition metal dichalcogenide lattices. For one such defect, a transition metal substitution for a chalcogen, Hubbard-Corrected Density Functional Theory predicts an induced magnetic moment at defect sites with long range interaction, thus making it the likely cause of the unexpected magnetism. Our most recent unpublished STM results further confirm this defect as the source of the magnetism.

 

Second Meeting: Thursday March 22nd 2018

Location: Columbia University

Room: 1332 Pupin

12-12:30 pizza lunch (sponsored by KeySight)

12:30-1:30pm seminar

Speaker: Yonah Lemonik, New York University

Title: Fluctuations in Transient Superfluids

 

First Meeting: Wednesday January 31th 2018

Location: NYU, 726 Broadway, New York, NY

Room: CSMR conference room #871 (8 floor)

12-12:30 pizza lunch sponsored by Keithley

12:30-1:30pm seminar

Speaker: Jia (Leo) Li, Columbia University

Title: Correlated states in graphene double-layer in the quantum Hall regime

 

Organizers:

Javad Shabani, NYU

Sebastian Will, Columbia U.