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Articles by B. Keimer
Probing amplified Josephson plasmons in YBa2Cu3O6+x by multidimensional spectroscopy - npj Quantum Materials
Abstract The nonlinear driving of collective modes in quantum materials can lead to a number of striking non-equilibrium functional responses, which merit a comprehensive exploration of underlying dynamics. However, the coherent coupling between nonlinearly-driven modes frequently involves multiple mode coordinates at once, and is often difficult to capture by one-dimensional pump probe spectroscopy.
Coincident onset of charge order and pseudogap in a homogeneous high-temperature superconductor - Nature Communications
Abstract Understanding high-temperature superconductivity in cuprates requires knowledge of the metallic phase it evolves from, particularly the pseudogap profoundly affecting the electronic properties at low carrier densities. A key question is the influence of chemical disorder, which is ubiquitous but exceedingly difficult to model. Using resonant X-ray scattering, we identified two-dimensional charge order in stoichiometric YBa2Cu4O8 (Tc = 80 K), which is nearly free of chemical disorder.
Reentrant multiple-q magnetic order and a “spin meta-cholesteric” phase in Sr3Fe2O7 - npj Quantum Materials
Abstract Topologically nontrivial magnetic structures such as skyrmion lattices are well known in materials lacking lattice inversion symmetry, where antisymmetric exchange interactions are allowed. Only recently, topological multi-q magnetic textures that spontaneously break the chiral symmetry, for example, three-dimensional hedgehog lattices, were discovered in centrosymmetric compounds, where they are instead driven by frustrated interactions.
Electronic response of a Mott insulator at a current-induced insulator-to-metal transition - Nature Physics
Abstract The Mott insulator Ca2RuO4 exhibits an insulator-to-metal transition induced by d.c. current. Despite the thorough examination of the structural changes associated with this transition, a comprehensive knowledge of the response of electronic degrees of freedom is still lacking. Here we demonstrate current-induced modifications of the electronic states of Ca2RuO4.
Magnetic field expulsion in optically driven YBa2Cu3O6.48 - Nature
Abstract Coherent optical driving in quantum solids is emerging as a research frontier, with many reports of interesting non-equilibrium quantum phases1,2,3,4 and transient photo-induced functional phenomena such as ferroelectricity5,6, magnetism7,8,9,10 and superconductivity11,12,13,14.
Using strain to uncover the interplay between two- and three-dimensional charge density waves in high-temperature superconducting YBa2Cu3Oy - Nature Communications
Abstract Uniaxial pressure provides an efficient approach to control charge density waves in YBa2Cu3Oy. It can enhance the correlation volume of ubiquitous short-range two-dimensional charge-density-wave correlations, and induces a long-range three-dimensional charge density wave, otherwise only accessible at large magnetic fields. Here, we use x-ray diffraction to study the strain dependence of these charge density waves and uncover direct evidence for a form of competition between them.
Photo-induced high-temperature ferromagnetism in YTiO3 - Nature
Optical set-up and MOKE detection Our MOKE measurements were carried out using the experimental set-up shown in Extended Data Fig. 1. The THz pump pulses were created by the chirped pulse difference frequency generation scheme described in detail in refs. 31,46.
The physics of quantum materials
The condensation of interacting electron systems into ground states with various forms of collective order has been an important subject of solid state research for many years. Before delving into some of the latest developments, it is useful to recall some basic aspects of electronic correlations that are already apparent in the physics of small molecules.
The physics of quantum materials
The condensation of interacting electron systems into ground states with various forms of collective order has been an important subject of solid state research for many years. Before delving into some of the latest developments, it is useful to recall some basic aspects of electronic correlations that are already apparent in the physics of small molecules.
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