Gregor Jotzu
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View article: Upper limit on magnetic field expulsion in optically driven <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi mathvariant="normal">K</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:msub> <mml:mi mathvariant="normal">C</mml:mi> <mml:mn>60</mml:mn> </mml:msub> </mml:mrow> </mml:math>
Upper limit on magnetic field expulsion in optically driven Open
Photoexcited K 3 C 60 displays several properties reminiscent of equilibrium superconductivity, including transient optical spectra, pressure dependence, and I – V characteristics. However, these observations do not decisiv…
View article: Generation of ultrafast magnetic steps for coherent control
Generation of ultrafast magnetic steps for coherent control Open
A long-standing challenge in ultrafast magnetism and functional materials research, in general, has been the generation of a universal, ultrafast stimulus able to switch between stable magnetic states. Solving this problem would open up ma…
View article: Generation of Ultrafast Magnetic Steps for Coherent Control
Generation of Ultrafast Magnetic Steps for Coherent Control Open
A long-standing challenge in ultrafast magnetism and in functional materials research in general, has been the generation of a universal, ultrafast stimulus able to switch between stable magnetic states. Solving it would open up many new o…
View article: Magnetic field expulsion in optically driven YBa2Cu3O6.48
Magnetic field expulsion in optically driven YBa2Cu3O6.48 Open
Coherent optical driving in quantum solids is emerging as a research frontier, with many reports of interesting non-equilibrium quantum phases 1–4 and transient photo-induced functional phenomena such as ferroelectricity 5,6 , magnetism 7–…
View article: Magnetic field expulsion in optically driven YBa$_2$Cu$_3$O$_{6.48}$
Magnetic field expulsion in optically driven YBa$_2$Cu$_3$O$_{6.48}$ Open
Coherent optical driving in quantum solids is emerging as a new research frontier, with many demonstrations of exotic non-equilibrium quantum phases. These are based on engineered band structures, and on stimulated nonlinear interactions b…
View article: Resonant enhancement of photo-induced superconductivity in K3C60
Resonant enhancement of photo-induced superconductivity in K3C60 Open
Photo-excitation at terahertz and mid-infrared frequencies has emerged as an effective way to manipulate functionalities in quantum materials, in some cases creating non-equilibrium phases that have no equilibrium analogue. In K 3 C 60 , a…
View article: Band Nonlinearity-Enabled Manipulation of Dirac Nodes, Weyl Cones, and Valleytronics with Intense Linearly Polarized Light
Band Nonlinearity-Enabled Manipulation of Dirac Nodes, Weyl Cones, and Valleytronics with Intense Linearly Polarized Light Open
We study low-frequency linearly polarized laser-dressing in materials with valley (graphene and hexagonal-Boron-Nitride) and topological (Dirac- and Weyl-semimetals) properties. In Dirac-like linearly dispersing bands, the laser substantia…
View article: Band nonlinearity-enabled manipulation of Dirac nodes, Weyl cones, and valleytronics with intense linearly polarized light
Band nonlinearity-enabled manipulation of Dirac nodes, Weyl cones, and valleytronics with intense linearly polarized light Open
We study low-frequency linearly-polarized laser-dressing in materials with valley (graphene and hexagonal-Boron-Nitride), and topological (Dirac- and Weyl-semimetals), properties. In Dirac-like linearly-dispersing bands, the laser substant…
View article: Topological Floquet engineering using two frequencies in two dimensions
Topological Floquet engineering using two frequencies in two dimensions Open
Using two-frequency driving in two dimensions opens up new possibilites for Floquet engineering, which range from controlling specific symmetries to tuning the properties of resonant gaps. In this work, we study two-band lattice models sub…
View article: Superconducting fluctuations observed far above T$_\mathrm{c}$ in the isotropic superconductor K$_3$C$_{60}$
Superconducting fluctuations observed far above T$_\mathrm{c}$ in the isotropic superconductor K$_3$C$_{60}$ Open
Alkali-doped fullerides are strongly correlated organic superconductors that exhibit high transition temperatures, exceptionally large critical magnetic fields and a number of other unusual properties. The proximity to a Mott insulating ph…
View article: A phase diagram for light-induced superconductivity in $\kappa$-(ET)$_2$-X
A phase diagram for light-induced superconductivity in $\kappa$-(ET)$_2$-X Open
Resonant optical excitation of certain molecular vibrations in\n$\\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Br has been shown to induce transient\nsuperconducting-like optical properties at temperatures far above equilibrium\n$T_c$. Here, we repo…
View article: Higgs-Mediated Optical Amplification in a Nonequilibrium Superconductor
Higgs-Mediated Optical Amplification in a Nonequilibrium Superconductor Open
The quest for new functionalities in quantum materials has recently been\nextended to non-equilibrium states, which are interesting both because they\nexhibit new physical phenomena and because of their potential for high-speed\ndevice app…
View article: Evidence for metastable photo-induced superconductivity in K<sub>3</sub>C<sub>60</sub>
Evidence for metastable photo-induced superconductivity in K<sub>3</sub>C<sub>60</sub> Open
Excitation of high-Tc cuprates and certain organic superconductors with intense far-infrared optical pulses has been shown to create non-equilibrium states with optical properties that are consistent with transient high-temperature superco…
View article: Light-induced topological magnons in two-dimensional van der Waals magnets
Light-induced topological magnons in two-dimensional van der Waals magnets Open
Driving a two-dimensional Mott insulator with circularly polarized light breaks time-reversal and inversion symmetry, which induces an optically-tunable synthetic scalar spin chirality interaction in the effective low-energy spin Hamiltoni…
View article: Report on 2007.01714v2
Report on 2007.01714v2 Open
Driving a two-dimensional Mott insulator with circularly polarized light breaks time-reversal and inversion symmetry, which induces an optically-tunable synthetic scalar spin chirality interaction in the effective low-energy spin Hamiltoni…
View article: Light-induced topological magnons in two-dimensional van der Waals magnets
Light-induced topological magnons in two-dimensional van der Waals magnets Open
Driving a two-dimensional Mott insulator with circularly polarized light breaks time-reversal and inversion symmetry, which induces an optically-tunable synthetic scalar spin chirality interaction in the effective low-energy spin Hamiltoni…
View article: Postponing Heat Death in Periodically Driven Systems
Postponing Heat Death in Periodically Driven Systems Open
An exponential suppression of heating has been observed in a periodically driven optical lattice, opening up an opportunity to engineer new states of matter.
View article: Topological Floquet Engineering of Twisted Bilayer Graphene
Topological Floquet Engineering of Twisted Bilayer Graphene Open
We investigate the topological properties of Floquet-engineered twisted bilayer graphene above the magic angle driven by circularly polarized laser pulses. Employing a full Moiré-unit-cell tight-binding Hamiltonian based on first-principle…
View article: Microscopic theory for the light-induced anomalous Hall effect in graphene
Microscopic theory for the light-induced anomalous Hall effect in graphene Open
We employ a quantum Liouville equation with relaxation to model the recently observed anomalous Hall effect in graphene irradiated by an ultrafast pulse of circularly polarized light. In the weak-field regime, we demonstrate that the Hall …
View article: Controlling the Floquet state population and observing micromotion in a periodically driven two-body quantum system
Controlling the Floquet state population and observing micromotion in a periodically driven two-body quantum system Open
Near-resonant periodic driving of quantum systems promises the implementation of a large variety of novel effective Hamiltonians. The challenge of Floquet engineering lies in the preparation and measurement of the desired quantum state. We…
View article: Creating topological interfaces and detecting chiral edge modes in a two-dimensional optical lattice
Creating topological interfaces and detecting chiral edge modes in a two-dimensional optical lattice Open
We propose and analyze a general scheme to create chiral topological edge modes within the bulk of two-dimensional engineered quantum systems. Our method is based on the implementation of topological interfaces, designed within the bulk of…
View article: Formation and Dynamics of Antiferromagnetic Correlations in Tunable Optical Lattices
Formation and Dynamics of Antiferromagnetic Correlations in Tunable Optical Lattices Open
We report on the observation of antiferromagnetic correlations of ultracold fermions in a variety of optical lattice geometries that are well described by the Hubbard model, including dimers, 1D chains, ladders, isolated and coupled honeyc…
View article: Exploring Competing Density Order in the Ionic Hubbard Model with Ultracold Fermions
Exploring Competing Density Order in the Ionic Hubbard Model with Ultracold Fermions Open
We realize and study the ionic Hubbard model using an interacting two-component gas of fermionic atoms loaded into an optical lattice. The bipartite lattice has a honeycomb geometry with a staggered energy offset that explicitly breaks the…
View article: Creating State-Dependent Lattices for Ultracold Fermions by Magnetic Gradient Modulation
Creating State-Dependent Lattices for Ultracold Fermions by Magnetic Gradient Modulation Open
We demonstrate a versatile method for creating state-dependent optical lattices by applying a magnetic field gradient modulated in time. This allows for tuning the relative amplitude and sign of the tunneling for different internal states.…