CENTER FOR QUANTUM MATERIALS AND CONDENSED MATTER PHYSICS SEMINARS

NEWS: The CQM Distinguished Lecture series has been established  in the Fall of 2015 to bring to Stony Brook University the renown experts in the physics of quantum matter.

The lectures in this series will attract a broad audience of physicists from SBU and BNL,
and SBU graduate students.

November 2019 – March 2020

Nov
8
Fri
Anderson Janotti (University of Delaware)
Nov 8 @ 1:30 pm – 2:30 pm

Title: Emergent Phenomena at the Interface of Complex Oxides

Host: Cyrus Dreyer

Progress in epitaxial growth of complex oxides have led to heterostructures with exquisite physical phenomena, such as the formation of a high-density two-dimensional electron gas (2DEG) at the interface between two normally insulating materials—e.g. SrTiO3/LaAlO3. Superconductivity and magnetic ordering have been demonstrated in these systems, sparking the interest in novel device applications. The formation of a 2DEG at the interface between SrTiO3 and Mott insulators, such as GdTiO3, has also been demonstrated, with electron densities that are over an order of magnitude higher than those realized with conventional semiconductors. Charge transport in these systems exhibit intriguing behavior, varying drastically from metal to insulator depending on the thickness of the building-block layers. Intensive research efforts in the last decade have raised questions regarding the origin of the excess charge, the mechanisms that determine the density of the 2DEG, and fundamental properties of the 2DEG. In this presentation, we will discuss how computer simulations can provide insights into the origin and nature of the 2DEG. Based on results of first-principles calculations we will discuss electron correlation effects and how the electronic structure of these heterostructures can be drastically altered, turning from metallic into insulating, through charge localization in ultrathin layers. Finally, we will address the interplay between orbital, charge, and spin in the manipulation of the magnetic ordering observed in some of these heterostructures.

Nov
15
Fri
Peter W. Stephens (SBU P&A)
Nov 15 @ 1:30 pm – 2:30 pm

title: Manganese Cyanide Tinkertoys

Nov
22
Fri
tentative special seminar
Nov 22 @ 1:30 pm – 2:30 pm

tentatively reserved by phil

Dec
6
Fri
Justin Wilson (Rutgers)
Dec 6 @ 1:30 pm – 2:30 pm

Host: Jen Cano

Dec
13
Fri
Navaneetha K. Ravichandran (Boston College)
Dec 13 @ 1:30 pm – 2:30 pm

host: Phil

Jan
31
Fri
John Tranquada (BNL)
Jan 31 @ 1:30 pm – 2:30 pm

host: Phil

Feb
7
Fri
Keji Lai (UT Austin)
Feb 7 @ 1:30 pm – 2:30 pm

Title: Microwave Nano-Imaging

Host: Mengkun

 
Feb
21
Fri
Practice March Meeting talks for students
Feb 21 @ 1:30 pm – 2:30 pm

Host: Jen

Mar
6
Fri
No seminar: March Meeting
Mar 6 @ 1:30 pm – 2:30 pm
Mar
13
Fri
Jigang Wang (ISU)
Mar 13 @ 2:30 pm – 3:30 pm

title: Ultrafast magnetism

host: Mengkun