Patrick Pilch
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View article: Sodium-based Donor-Acceptor Assemblies Featuring Thermally Activated Delayed Fluorescence Enabled by Highly Efficient Through-Space Charge Transfer
Sodium-based Donor-Acceptor Assemblies Featuring Thermally Activated Delayed Fluorescence Enabled by Highly Efficient Through-Space Charge Transfer Open
Exploring more economical and innovative alternatives to precious 4d and 5d metal complexes used in photocatalysis, OLEDs, or energy conversion has primarily focused on 3d metals, leaving highly abundant alkali...
View article: Terahertz Third-Harmonic Generation of Lightwave-Driven Weyl Fermions Far from Equilibrium
Terahertz Third-Harmonic Generation of Lightwave-Driven Weyl Fermions Far from Equilibrium Open
We report on time-resolved ultrafast terahertz third-harmonic generation spectroscopy of nonequilibrium dynamics of Weyl fermions in a nanometer thin film of the Weyl semimetal TaP. Terahertz third-harmonic generation is observed at room t…
View article: Giant enhancement of terahertz high-harmonic generation by cavity engineering of Dirac semimetal
Giant enhancement of terahertz high-harmonic generation by cavity engineering of Dirac semimetal Open
Engineered micro- or nano-structures based on nonlinear optical materials offer versatile opportunities for optoelectronic applications. While extensive efforts have been devoted to design tailored microcavities to promote and increase the…
View article: Sodium-Based Donor-Acceptor Assemblies Featuring Thermally Activated Delayed Fluorescence Enabled by Highly Efficient Through-Space Charge Transfer
Sodium-Based Donor-Acceptor Assemblies Featuring Thermally Activated Delayed Fluorescence Enabled by Highly Efficient Through-Space Charge Transfer Open
Exploring more economical and innovative alternatives to precious 4d and 5d metal complexes used in photocatalysis, OLEDs, or energy conversion has primarily focused on 3d metals, leaving highly abundant alkali metals underexplored. We sho…
View article: Nonlinear terahertz phononics in the Dirac semimetal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Cd</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Nonlinear terahertz phononics in the Dirac semimetal Open
The coherent lattice dynamics in the three-dimensional (3D) Dirac semimetal Cd3As2 is investigated in the nonperturbative regime of light-matter interaction using coherent two-dimensional terahertz (THz) spectroscopy, as a function of time…
View article: Distinct terahertz third-harmonic generation of many-body excitonic states
Distinct terahertz third-harmonic generation of many-body excitonic states Open
The dynamics of an electron-hole plasma governed by strong Coulomb interaction is a challenging many-body problem.We report on experimental realization of electron-hole many-body states in the picosecond time scale, with tunable densities …
View article: Terahertz electro-optic Kerr effect in LaAlO3
Terahertz electro-optic Kerr effect in LaAlO3 Open
In this letter, we investigate the terahertz (THz) electro-optic Kerr effect (KE) dynamics in LaAlO3 (LAO), a widely used substrate for thin film preparation. We show that the KE dynamics strongly depend on the material anisotropy due to i…
View article: Low-energy spin excitations in field-induced phases of the spin-ladder antiferromagnet BiCu$_2$PO$_6$
Low-energy spin excitations in field-induced phases of the spin-ladder antiferromagnet BiCu$_2$PO$_6$ Open
We report on terahertz spectroscopic measurements of quantum spin dynamics on single crystals of a spin-1/2 frustrated spin-ladder antiferromagnet BiCu$_2$PO$_6$ as a function of temperature, polarization, and applied external magnetic fie…
View article: Ultrafast unidirectional spin Hall magnetoresistance driven by terahertz light field
Ultrafast unidirectional spin Hall magnetoresistance driven by terahertz light field Open
The ultrafast control of magnetisation states in magnetically ordered systems is a key technological challenge for developing memory devices operable at picosecond timescales or terahertz (THz) frequencies. Despite significant efforts in u…
View article: Population inversion and ultrafast terahertz nonlinearity of transient Dirac fermions in Cd$_3$As$_2$
Population inversion and ultrafast terahertz nonlinearity of transient Dirac fermions in Cd$_3$As$_2$ Open
Harmonic generation provides an efficient tool for the study of ultrafast nonlinear dynamics. We report on time-resolved optical-pump terahertz-harmonic-generation spectroscopic investigation of ultrafast nonlinearity in a prototypical thr…
View article: Field and Polarization Dependent Quantum Spin Dynamics in Honeycomb Magnet Na$_2$Co$_2$TeO$_6$: Magnetic Excitations and Continuum
Field and Polarization Dependent Quantum Spin Dynamics in Honeycomb Magnet Na$_2$Co$_2$TeO$_6$: Magnetic Excitations and Continuum Open
We report terahertz spectroscopic measurements of quantum spin dynamics in the spin-1/2 honeycomb magnet Na$_2$Co$_2$TeO$_6$ as a function of applied magnetic field with different terahertz polarizations. Distinct field dependencies of the…
View article: Ultrafast dynamics of optically excited charge carriers in the room-temperature antiferromagnetic semiconductor $α$-MnTe
Ultrafast dynamics of optically excited charge carriers in the room-temperature antiferromagnetic semiconductor $α$-MnTe Open
We report on time-resolved optical and terahertz ultrafast spectroscopy of charge-carrier dynamics in the room-temperature antiferromagnetic semiconductor $α$-MnTe. By optically pumping the system with 1.55 eV photons at room temperature, …
View article: High-order nonlinear terahertz probing of the two-band superconductor MgB$_2$: Third- and fifth-order harmonic generation
High-order nonlinear terahertz probing of the two-band superconductor MgB$_2$: Third- and fifth-order harmonic generation Open
We report on high-order harmonic generation in the two-band superconductor MgB$_2$ driven by intense terahertz electromagnetic pulses. Third- and fifth-order harmonics are resolved in time domain and investigated as a function of temperatu…