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.
Jan
31
Fri
speaker: John Tranquada (BNL) host: Phil
Jan 31 @ 1:30 pm – 2:30 pm

Intertwined Orders in Cuprate Superconductors

John Tranquada

Condensed Matter Physics & Materials Science Division

Brookhaven National Laboratory, Upton, NY 11973-5000

While the nature of cuprate superconductors remains controversial, the concept of intertwined orders provides a consistent way to understand multiple types of superconductivity in these hole-doped antiferromagnets [1].  Neutron and x-ray scattering experiments have demonstrated the tendency for the doped holes to segregate into stripes that are separated by locally-antiferromagnetic regions.  As originally proposed by Emery, Kivelson, and Zachar [2], the hole stripes can develop pairing correlations, but superconducting order is limited by the ability to establish phase order by Josephson coupling through the intervening magnetic regions.  When those intervening spin correlations can be gapped, spatially-uniform superconductivity can develop, where the coherent gap is limited by the spin gap [3].  When the spin-stripe correlations are strong, an alternative superconducting state involves a spatially-modulated pair wave function (pair density wave) intertwined with spin stripe order.  A sufficiently strong magnetic field destroys the superconducting order without disrupting the pair correlations within the stripes [4].

 

  1. E. Fradkin et al., Rev. Mod Phys. 87, 457 (2015).
  2. V. J. Emery et al., Phys. Rev. B 56, 6120 (1997).
  3. Yangmu Li et al., Phys. Rev. B 98, 224508 (2018).
  4. Yangmu Li et al., Sci. Adv. 5, eaav7686 (2019).
Feb
7
Fri
Keji Lai (UT Austin)
Feb 7 @ 1:30 pm – 2:30 pm

Title: Microwave Nano-Imaging

Host: Mengkun

 
Feb
21
Fri
Feb 21 @ 1:30 pm – 2:30 pm

(Reserved for Kharzeev)

Feb
28
Fri
Feb 28 @ 1:30 pm – 2:30 pm

Reserved (Kharzeev)

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

Mar
20
Fri
No seminar: Spring Break
Mar 20 @ 1:30 pm – 2:30 pm
Mar
27
Fri
Manuel Zingl (Flatiron CCQ)
Mar 27 @ 1:30 pm – 2:30 pm

Title: TBD

Host: Cyrus Dreyer

Apr
3
Fri
Xiaoji Xu (Lehigh)
Apr 3 @ 1:30 pm – 2:30 pm

title: Novel optical probe scanning method

host: Mengkun

Apr
10
Fri
Igor Zaliznyak (BNL)
Apr 10 @ 1:30 pm – 2:30 pm

Title: TBD

Host: Sasha Abanov