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A light-induced Weyl semiconductor-to-metal transition mediated by Peierls instability
H. Ning, O. Mehio, C. Lian +7
Elemental tellurium is a strongly spin-orbit coupled Peierls-distorted semiconductor whose band structure features topologically protected Weyl nodes. Using time-dependent density…
Direct visualization and control of antiferromagnetic domains and spin reorientation in a parent cuprate
K. L. Seyler, A. Ron, D. Van Beveren +3
We report magnetic optical second-harmonic generation (SHG) polarimetry and imaging on SrCuOCl, which allows direct visualization of the mesoscopic antiferromagneti…
Giant modulation of optical nonlinearity by Floquet engineering
Jun-Yi Shan, M. Ye, Sungmin Lee +3
Strong periodic driving with light offers the potential to coherently manipulate the properties of quantum materials on ultrafast timescales. Recently, strategies have emerged to d…
Keldysh space control of charge dynamics in a strongly driven Mott insulator
Xinwei Li, Honglie Ning, Omar Mehio +7
The fate of a Mott insulator under strong low frequency optical driving conditions is a fundamental problem in quantum many-body dynamics. Using ultrafast broadband optical spectro…
Decoupling of static and dynamic criticality in a driven Mott insulator
A. de la Torre, K. L. Seyler, M. Buchhold +12
Dynamically driven interacting quantum many-body systems have the potential to exhibit properties that defy the laws of equilibrium statistical mechanics. A widely studied model is…
Magnetic order, disorder, and excitations under pressure in the Mott insulator SrIrO
Xiang Li, S. E. Cooper, A. Krishnadas +7
Protected by the interplay of on-site Coulomb interactions and spin-orbit coupling, SrIrO at high pressure is a rare example of a Mott insulator with a paramagnetic ground…
Implications of second harmonic generation for hidden order in SrCuOCl
A. de la Torre, S. Di Matteo, D. Hsieh +1
SrCuOCl (SCOC) is a model undoped cuprate with crystallographic symmetry, and a simple magnetic space group with associated magnetic point group $mmm1…
Signatures of ultrafast reversal of excitonic order in TaNiSe
H. Ning, O. Mehio, M. Buchhold +4
In the presence of electron-phonon coupling, an excitonic insulator harbors two degenerate ground states described by an Ising-type order parameter. Starting from a microscopic Ham…
Spin-orbit-enhanced magnetic surface second-harmonic generation in SrIrO
K. L. Seyler, A. de la Torre, Z. Porter +6
An anomalous optical second-harmonic generation (SHG) signal was previously reported in SrIrO and attributed to a hidden odd-parity bulk magnetic state. Here we investigate…
Controlling ligand-mediated exchange interactions in periodically driven magnetic materials
Swati Chaudhary, Alon Ron, David Hsieh +1
A periodic drive could alter the effective exchange interactions in magnetic materials. Here, we explore how exchange pathways affect the effective interactions of periodically dri…
Linear magneto-electric phase in ultrathin MnPS probed by optical second harmonic generation
H. Chu, C. J. Roh, J. O. Island +7
The transition metal thiophosphates PS ( = Mn, Fe, Ni) are a class of van der Waals stacked insulating antiferromagnets that can be exfoliated down to the ultrathin limit…
Evidence for a Parity Broken Monoclinic Ground State in the S = 1/2 Kagomé Antiferromagnet Herbertsmithite
N. J. Laurita, A. Ron, J. W. Han +9
Nearest-neighbor interacting S = 1/2 spins on the ideal Kagomé lattice are predicted to form a variety of novel quantum entangled states, including quantum spin-liquid (SL) and val…
Valence bond phases of herbertsmithite and related copper kagome materials
M. R. Norman, N. J. Laurita, D. Hsieh
Recent evidence from magnetic torque, electron spin resonance, and second harmonic generation indicate that the prototypical quantum spin liquid candidate, herbertsmithite, has a s…
Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal
N. J. Laurita, A. Ron, J. Shan +6
Over 50 years ago, Anderson and Blount proposed that ferroelectric-like structural phase transitions may occur in metals, despite the expected screening of the Coulomb interactions…
Orbital Floquet Engineering of Exchange Interactions in Magnetic Materials
Swati Chaudhary, David Hsieh, Gil Refael
We present a new scheme to control the spin exchange interactions between two magnetic ions by manipulating the orbital degrees of freedom using a periodic drive. We discuss two di…
Floquet Engineering in Quantum Chains
D. M. Kennes, A. de la Torre, A. Ron +2
We consider a one-dimensional interacting spinless fermion model, which displays the well-known Luttinger liquid (LL) to charge density wave (CDW) transition as a function of the r…
Doping driven structural distortion in the bilayer iridate (SrLa)IrO
Tom Hogan, Xiaoping Wang, H. Chu +2
Neutron single crystal diffraction and rotational anisotropy optical second harmonic generation data are presented resolving the nature of the structural distortion realized in ele…
A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal CdReO
J. W. Harter, Z. Y. Zhao, J. -Q. Yan +2
Strong electron interactions can drive metallic systems toward a variety of well-known symmetry-broken phases, but the instabilities of correlated metals with strong spin-orbit cou…
A global inversion-symmetry-broken phase inside the pseudogap region of YBaCuO
L. Zhao, C. A. Belvin, R. Liang +4
The phase diagram of cuprate high-temperature superconductors features an enigmatic pseudogap region that is characterized by a partial suppression of low energy electronic excitat…
Structural investigation of the bilayer iridate Sr3Ir2O7
Tom Hogan, Lars Bjaalie, Liuyan Zhao +5
A complete structural solution of the bilayer iridate compound Sr3Ir2O7 presently remains outstanding. Previously reported structures for this compound vary and all fail to explain…
Nonlinear and time-resolved optical study of the 112-type iron-based superconductor parent CaLaFeAs across its structural phase transition
J. W. Harter, H. Chu, S. Jiang +2
The newly discovered 112-type ferropnictide superconductors contain chains of As atoms that break the tetragonal symmetry between the and axes. This feature eliminates the…
Evidence of an odd-parity hidden order in a spin-orbit coupled correlated iridate
L. Zhao, D. H. Torchinsky, H. Chu +6
A rare combination of strong spin-orbit coupling and electron-electron correlations makes the iridate Mott insulator SrIrO a promising host for novel electronic phases of m…
A structural distortion induced magneto-elastic locking in SrIrO revealed through nonlinear optical harmonic generation
D. H. Torchinsky, H. Chu, L. Zhao +5
We report a global structural distortion in SrIrO using spatially resolved optical second and third harmonic generation rotational anisotropy measurements. A symmetry lower…
A Low Temperature Nonlinear Optical Rotational Anisotropy Spectrometer for the Determination of Crystallographic and Electronic Symmetries
D. H. Torchinsky, H. Chu, T. Qi +2
Nonlinear optical generation from a crystalline material can reveal the symmetries of both its lattice structure and underlying ordered electronic phases and can therefore be explo…