@article {238, title = {Linear dichroism infrared resonance in overdoped, underdoped, and optimally doped cuprate superconductors}, journal = {Physical Review B}, volume = {102}, number = {5}, year = {2020}, note = {ISI Document Delivery No.: NE5GO
Times Cited: 0
Cited Reference Count: 30
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Mukherjee, A. Seo, J. Arik, M. M. Zhang, H. Zhang, C. C. Kirzhner, T. George, D. K. Markelz, A. G. Armitage, N. P. Koren, G. Wei, J. Y. T. Cerne, J.
NSF-DMR GrantNational Science Foundation (NSF) [1410599]; NSFNational Science Foundation (NSF) [MCB 1616529, DMR 1905519]; DOEUnited States Department of Energy (DOE) [DE-SC0016317]; NSERCNatural Sciences and Engineering Research Council of Canada (NSERC); CFI-OITCanada Foundation for Innovation; Canadian Institute for Advanced ResearchCanadian Institute for Advanced Research (CIFAR)
We are indebted to D. Hsieh, S. A. Kivelson, C. M. Varma, and L. Zhao for helpful discussions. We gratefully acknowledge support from NSF-DMR Grant No. 1410599 (J.C.). A.G.M. and D.K.G. were supported by NSF Grant No. MCB 1616529 and DOE Grant No. DE-SC0016317. Work in Toronto was supported by NSERC, CFI-OIT, and the Canadian Institute for Advanced Research. J.Y.T.W. thanks Kejun Xu for laboratory assistance in Toronto. N.P.A. was supported by NSF Grant No. DMR 1905519.

9
Amer physical soc
College pk
2469-9969}, month = {Aug}, pages = {6}, type = {Article}, abstract = {

By measuring the polarization changes in terahertz, infrared, and visible radiation over an extended energy range (3-2330 meV), we observe symmetry breaking in cuprate high-temperature superconductors over wide energy, doping, and temperature ranges. We measure the polarization rotation (Re[theta(F)]) and ellipticity (Im[theta(F)]) of transmitted radiation through thin films as the sample is rotated. We observe a twofold rotational symmetry in theta(F), which is associated with linear dichroism (LD) and occurs when electromagnetic radiation polarized along one direction is absorbed more strongly than radiation polarized in the perpendicular direction. Such polarization anisotropies can be generally associated with symmetry breakings. We measure the amplitude of the LD signal and study its temperature, energy, and doping dependence. The LD signal shows a resonant behavior with a peak in the few hundred meV range, which is coincident with the midinfrared optical feature that has been associated with the formation of the pseudogap state. The strongest LD signal is found in underdoped films, although it is also observed in optimally and overdoped samples. The LD signal is consistent with an electronic nematic order which is decoupled from the crystallographic axes as well as novel magnetoelectric effects.

}, keywords = {Materials Science, Physics}, isbn = {2469-9950}, doi = {10.1103/PhysRevB.102.054520}, author = {Mukherjee, A. and Seo, J. and Arik, M. M. and Zhang, H. and Zhang, C. C. and Kirzhner, T. and George, D. K. and Markelz, A. G. and Armitage, N. P. and Koren, G. and Wei, J. Y. T. and Cerne, J.} } @article {252, title = {Long Range Correlated Motions of TIM and their Possible Influence on Enzyme Function}, journal = {Biophysical Journal}, volume = {118}, number = {3}, year = {2020}, note = {ISI Document Delivery No.: KK8YX
Times Cited: 0
Cited Reference Count: 4
Cited References:
Acbas G, 2014, NAT COMMUN, V5, DOI 10.1038/ncomms4076
Niessen K.A. M.Y., 2017, BIOPHYS J, DOI [10.1016/j.bpj.2016.12.049.3., DOI 10.1016/J.BPJ.2016.12.049.3]
Niessen K, 2019, OPT EXPRESS, V27, P28036, DOI 10.1364/OE.27.028036
Niessen KA, 2019, NAT COMMUN, V10, DOI 10.1038/s41467-019-08926-3
McKinney, Jeffrey A. Deng, Yanting George, Deepu K. Richard, John Markelz, Andrea G.
64th Annual Meeting of the Biophysical-Society
Feb 15-19, 2020
San Diego, CA
Biophys Soc
NSFNational Science Foundation (NSF) [DBI 1556359, MCB 1616529]; DOEUnited States Department of Energy (DOE) [DE-SC0016317]; NIH STTRUnited States Department of Health \& Human ServicesNational Institutes of Health (NIH) - USA [R41 GM125486.1]
This work is supported by NSF grants DBI 1556359 and MCB 1616529, DOE grant DE-SC0016317 and NIH STTR R41 GM125486.1.

1
Cell press
Cambridge
1542-0086}, month = {Feb}, pages = {207A-207A}, type = {Meeting Abstract}, abstract = {

The alpha-beta barrel structure of triosephosphate isomerase (TIM) is possibly the most common among enzymes. In the case of TIM, structural dynamics are known to be essential to function. In particular the stabilization of the binding pocket by a phosphodianion {\textquotedblleft}handle{\textquotedblright} of the substrate and the closing of catalytic site loops 6 and 7 over the substrate. Loop 6 moves by as much as 7 Angstroms with binding. Recently a mutant survey for human TIM (hsTIM) found kcat can change significantly for a single mutation distant from the catalytic site. Crystallographic measurements find no structural change with the mutation, suggesting a dynamical mechanism for the allosteric effect. Here we use Stationary Sample Anisotropic Terahertz Microscopy (SSATM) to measure the long-range intramolecular vibrations and determine if specific vibrations couple the allosteric and catalytic sites. SSATM isolated protein long-range structural vibrations based on the dominant displacement direction [1-4]. We examine if specific vibrational bands are associate with loop 6 and loop 7 flexibility.

}, keywords = {Biophysics}, isbn = {0006-3495}, doi = {10.1016/j.bpj.2019.11.1240}, author = {McKinney, J. A. and Deng, Y. T. and George, D. K. and Richard, J. and Markelz, A. G.} }