Probing and Manipulating Quantum Materials with Strong-field Terahertz and Mid-infrared Radiation

arXiv:2610.11126 · cond-mat.str-el, physics.optics · Submitted 2026-10-08 · Read on arXiv

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Introduction to the show: ident: Quantum Radio. Generated commentary on the latest quantum physics and condensed matter papers.

Kai: Today's paper: "Probing and Manipulating Quantum Materials with Strong-field Terahertz and Mid-infrared Radiation".

Mira: The gist: This review surveys recent progress in probing and manipulating quantum materials with strong-field THz and MIR radiation, with emphasis on nonlinear electronic dynamics, collective-mode coupling,

Kai: First, who's behind it and why it matters.

Paper summary: Mira: The paper starts by talking about how you actually generate these strong fields, mentioning accelerator-based sources and laser-driven tabletop systems <ref:two thousand six hundred four point zero two five four three.

Kai: They mention that optical rectification is one of the main ways to get intense broadband terahertz pulses <ref:two thousand six hundred ten point one one one two six#pg3.

Mira: Organic crystals like DAST and DSTMS can provide broader spectra reaching fields in the MV/cm regime <ref:two thousand six hundred four point zero two five four three.

Lev: Differencefrequency generation between phase-coherent optical pulses lets you tune the radiation spectrally, even into the mid-infrared range with extremely high fields <ref:two thousand six hundred ten point one one one two six#pg3.

Kai: Laser-induced plasmas offer a different route entirely, a crystal-free way to get ultrabroadband terahertz generation <ref:two thousand six hundred four point zero two five four three.

Mira: Polarization is another degree of freedom they control, which lets you select symmetry-dependent electric or magnetic dipole responses <ref:two thousand six hundred ten point one one one two six#pg3.

Lev: Two-color excitation allows the emitted field to be controlled through the relative phase and polarization of the driving pulses <ref:two thousand six hundred four point zero two five four three.

Kai: So they are showing that you have a lot of options for creating these intense fields, depending on whether you want broadband or narrowband excitation <ref:two thousand six hundred ten point one one one two six#pg3.

Mira: This diversity in generation is key because it lets them choose between sub-cycle dynamics from broadband pulses and selective resonant driving with narrowband pulses <ref:two thousand six hundred four point zero two five four three.

Lev: The authors also note that relativistic laser–foil interactions can create a plasma-based route to extreme terahertz pulses, reaching terawatt regimes <ref:two thousand six hundred ten point one one one two six#pg3.

Kai: It sounds like the generation side is all about tailoring the field precisely for what you want to probe, whether you need a quick burst or something sustained <ref:two thousand six hundred four point zero two five four three.

Conclusion: Mira: Now that we have these fields, the paper moves into how you actually measure them, discussing experimental schemes like high-harmonic generation and multidimensional spectroscopy <ref:two thousand six hundred ten point one one one two six#pg5.

Kai: High-harmonic generation directly probes the nonlinear current or polarization of the material when driven hard <ref:two thousand six hundred four point zero two five four three.

Mira: Multidimensional THz spectroscopy adds more fields, and that lets you separate the nonlinear signal based on both excitation and detection frequencies <ref:two thousand six hundred ten point one one one two six#pg5.

Lev: Pump–probe measurements are used to characterize the state that remains or evolves after the initial excitation using a weaker delayed probe <ref:two thousand six hundred four point zero two five four three.

Kai: Then there's THz/MIR-pump–THz-probe spectroscopy, which measures transient complex conductivity and tracks changes in transport, gaps, spectral weight, and collective modes <ref:two thousand six hundred ten point one one one two six#pg5.

Mira: These measurement techniques are what let them go beyond just seeing a linear response; they are designed to capture the nonlinear signal itself <ref:two thousand six hundred four point zero two five four three.

Lev: This suite of experimental setups allows them to characterize both the nonlinear response generated during the drive and what happens after excitation <ref:two thousand six hundred ten point one one one two six#pg5.

Kai: What this means for us is that we have a clear roadmap for how to set up experiments that can capture these complex, transient events happening at high intensity <ref:two thousand six hundred four point zero two five four three.

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences · School of Physical Sciences, University of Chinese Academy of Sciences · Attosecond Science Center, Songshan Lake Materials Laboratory

cond-mat.str-el, physics.optics

Submitted: 2026-10-08

Updated: 2026-10-08

Comments: 20 pages, 2 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Importance score: 87/100

The gist: The gist: This review surveys recent progress in probing and manipulating quantum materials with strong-field THz and MIR radiation, with emphasis on nonlinear electronic dynamics, collective-mode

Key concepts

Nonlinear Electronic Dynamics
This explores how intense electromagnetic fields affect the movement of charge carriers within a material. The field can cause carriers to accelerate in momentum space or excite them across energy gaps, leading to complex currents and new behaviors that aren't seen in normal, weak-field conditions.
Collective-Mode Coupling
This involves studying how the material's internal oscillations (like vibrations or magnetic excitations) interact with the strong external field. By driving one mode resonantly, researchers can observe how this energy is transferred to other modes, revealing hidden dynamics within the material.
Field-Induced Changes in Electronic Structure
Strong THz/MIR fields can fundamentally alter how electrons behave by reshaping the material's electronic Hamiltonian. This happens through effects like the Stark effect or Floquet dressing, which can create new energy bands or open gaps, effectively changing the material's fundamental electronic properties.
Resonant Collective-Mode Control
This technique uses tailored radiation to specifically target and manipulate a material's ordered states. By exciting a specific collective coordinate at its natural resonance frequency, researchers can induce large-amplitude displacements or transfer energy to other degrees of freedom, allowing for precise control over the material's structure.

Terminology

Summary

The gist: This review surveys recent progress in probing and manipulating quantum materials with strong-field THz and MIR radiation, with emphasis on nonlinear electronic dynamics, collective-mode coupling, symmetry-sensitive responses and field-induced changes in electronic structure and ordered states

Probing Quantum Materials

Emergent phenomena in quantum materials arise from interactions among different degrees of freedom Identifying these interactions and establishing their roles in ordered states are central problems in condensedmatter physics and provide a basis for controlling material properties Many relevant low-energy excitations and gaps lie in the terahertz (THz) and mid-infrared (MIR) range, where intense phase-stable fields can both interrogate nonlinear dynamics and drive selected degrees of freedom far from equilibrium This review surveys recent progress in probing and manipulating quantum materials with strong-field THz and MIR radiation, with emphasis on nonlinear electronic dynamics, collective-mode coupling, symmetry-sensitive responses and field-induced changes in electronic structure and ordered states

Generation and Detection of Strong-Field Pulses

Strong-field THz sources include accelerator-based sources and laser-driven tabletop systems<ref:2610.11126#pg3> Optical rectification is one of the principal routes to intense broadband THz pulses<ref:2610.11126#pg3> Organic nonlinear crystals such as DAST and DSTMS provide broader spectra extending to higher frequencies, with fields reaching the MV/cm regime<ref:2610.11126#pg4> Differencefrequency generation between phase-coherent optical pulses provides spectrally tunable few-cycle or multicycle radiation and can reach extremely high fields in the THz and MIR range<ref:2610.11126#pg4> Laser-induced plasmas provide a complementary crystal-free route to ultrabroadband THz generation<ref:2610.11126#pg4> Polarization provides an additional degree of freedom for controlling light–matter coupling, as linear polarization selects symmetry-dependent electric- or magnetic-dipole responses<ref:2610.11126#pg4>

Experimental Schemes for Strong-Field Spectroscopy

Strong-field THz experiments can characterize both the nonlinear response generated during the drive and the state that remains or evolves after excitation<ref:2610.11126#pg5> High-harmonic generation directly probes nonlinear current or polarization<ref:2610.11126#pg5> Multidimensional THz spectroscopy adds one or more independently delayed fields and separates the nonlinear signal as a function of excitation and detection frequencies<ref:2610.11126#pg5> Pump–probe measurements characterize the driven state with a weaker delayed probe<ref:2610.11126#pg5> THz/MIR-pump–THz-probe spectroscopy measures transient complex conductivity and follows changes in transport, gaps, spectral weight and collective modes<ref:2610.11126#pg5>

Physical Insights from Nonlinear Spectroscopy

Nonlinear electronic dynamics are explored through several mechanisms<ref:2610.11126#pg6> Intraband acceleration describes how the electromagnetic field can shift carriers in momentum space, leading to band-structure-induced nonlinear current when the field drives carriers into regions of nonparabolic or periodic band dispersion<ref:2610.11126#pg6> Interband excitation and electron–hole dynamics occur when the drive accesses interband transitions, creating electron–hole pairs that can subsequently be accelerated by the same field<ref:2610.11126#pg6> Nonlinear spectroscopy of collective modes provides access to dynamics beyond linear spectra, such as superconducting amplitude dynamics where nonlinear THz excitation is a principal route for its detection<ref:2610.11126#pg7> Anharmonic lattice dynamics and mode coupling are revealed when higher-order terms in the potential-energy surface become relevant, leading to harmonic generation and amplitudedependent frequency shifts<ref:2610.11126#pg8> Multidimensional THz spectroscopy can resolve nonlinear pathways, such as distinguishing electronic Raman excitation from anharmonic phonon-mediated driving<ref:2610.11126#pg8> Magnon coherence and nonlinear coupling are constrained by higher harmonics and wave mixing, which reveal correlations between magnon branches<ref:2610.11126#pg9>

Strong-Field Control of Electronic Structure

Strong THz/MIR fields can reshape the electronic Hamiltonian before substantial scattering occurs via the Stark effect or Floquet dressing<ref:2610.11126#pg10> In quantum-confined systems, an out-of-plane field can modify electron and hole wave functions through the quantum-confined Stark effect (QCSE)<ref:2610.11126#pg11> For the Floquet picture, a periodic drive can generate photon-dressed replica bands and open gaps where these replicas hybridize<ref:2610.11126#pg11> Strong THz fields can drive electronic breakdown even when the photon energy lies far below the electronic gap through field-induced tunneling in Mott insulators<ref:2610.11126#pg11>

Resonant Collective-Mode Control of Ordered States

Resonant excitation offers a mode-selective route for controlling ordered states by preferentially driving a selected collective coordinate<ref:2610.11126#pg12> Direct driving of functional collective modes can generate large-amplitude displacements, such as the soft polar mode of quantum-paraelectric SrTiO3<ref:2610.11126#pg12> Indirect control through auxiliary-mode coupling allows the drive to be transferred to another lattice, electronic or magnetic coordinate via nonlinear coupling<ref:2610.11126#pg13> Helicity-selective control emerges when two orthogonal phonon coordinates are driven with a well-defined relative phase, generating an effective magnetic field that couples to magnetic or ferroic degrees of freedom<ref:2610.11126#pg13>

Advances and Perspectives at SECUF

SECUF provides a distinctive combination of spectrally flexible strong-field excitation, multidimensional and phase-sensitive THz detection, and precise control of external thermodynamic parameters<ref:2610.11126#pg14> Future advances will benefit from deeper integration of THz/MIR excitation with time-resolved photoemission, ultrafast electron diffraction, ultrafast X-ray techniques and other momentum-, structure- and symmetry-sensitive measurements<ref:2610.11126#pg14> This integrated approach will provide new opportunities to establish connections between microscopic interactions and emergent nonequilibrium states<ref:2610.11126#pg14>

Acknowledgments

This work was supported by the National Key Research and Development Program of China (No. 2024YFA1408703) and the National Natural Science Foundation of China (Nos. U24A2016, 12304184 and 12574164)

References

[1] Elbio Dagotto. Complexity in strongly correlated electronic systems. Science, 309(5732):257–262, 2005

[3] Albert Liu. Multidimensional terahertz probes of quantum materials. npj Quantum Materials, 10(1):18, February 2025

[4] Chuankun Huang, Martin Mootz, Liang Luo, Ilias E. Perakis, and Jigang Wang. Terahertz 2D coherent spectroscopy for probing and controlling multicorrelations in quantum matter. Nature Reviews Physics, 8(3):171–185, February 2026

[5] Tobias Kampfrath, Koichiro Tanaka, and Keith A. Nelson. Resonant and nonresonant control over matter and light by intense terahertz transients. Nature Photonics, 7(9):680–690, September 2013

[6] H. Hirori, A. Doi, F. Blanchard, and K. Tanaka. Single-cycle terahertz pulses with amplitudes exceeding 1 mv/cm generated by optical rectification in linbo3. Applied Physics Letters, 98(9):091106, 2011

[7] Alexander Sell, Alfred Leitenstorfer, and Rupert Huber. Phase-locked generation and field-resolved detection of widely tunable terahertz pulses with amplitudes exceeding 100 MV/cm. Optics Letters, 33(23):2767, December 2008

[8] Masaaki Sato, Takuya Higuchi, Natsuki Kanda, Kuniaki Konishi, Kosuke Yoshioka, Takayuki Suzuki, Kazuhiko Misawa, and Makoto Kuwata-Gonokami. Terahertz polarization pulse shaping with arbitrary field control. Nature Photonics, 7(9):724–731, September 2013

[9] D. N. Basov, R. D. Averitt, and D. Hsieh. Towards properties on demand in quantum materials. Nature Materials, 16(11):1077–1088, November 2017

[10] Alberto De La Torre, Dante M. Kennes, Martin Claassen, Simon Gerber, James W. McIver, and Michael A. Sentef. Colloquium: nonthermal pathways to ultrafast control in quantum materials. Reviews of Modern Physics, 93(4):041002, October 2021

[11] Liwei Song, Xiaojun Wu, Hua Li, Yuxin Leng, Ye Tian, and Ruxin Li. Review of intense terahertz generation and its emerging applications. Applied Physics Reviews, 13(2):021302, June 2026

[15] T. Suter, Z. Macdermid, Z. Chen, S. L. Johnson, and E. Abreu. Terahertz time-domain spectroscopy of materials under high pressure in a diamond anvil cell.

Improvements for AI systems

  1. textbf Strong-Field Nonlinear Dynamics Simulation Engine (SFNDSE) using Section 4.1 data: The system can simulate Band-structure-induced nonlinear current by inputting specific band dispersion parameters and driving waveforms, directly connecting the nonlinear waveform to the periodic band dispersion [38] to predict observable high-frequency radiation.

  2. textbf Collective Mode Coupling Predictor (CMCP) leveraging Section 4.2: The AI can predict band-selective amplitude responses and dynamical interference between superconducting and charge-densitywave amplitude modes in complex materials by analyzing the frequency, phase, and field dependence of nonlinear THz signals, as described in the context of multidimensional spectroscopy.

  3. textbf Symmetry-Sensitive Response Classifier (SSRC) based on Section 4.3: The system can classify microscopic dynamics by distinguishing excitation pathways using distinct excitation–detection frequency correlations, specifically identifying whether a signal arises from electronic Raman excitation from anharmonic phonon-mediated driving versus phonon mediated mechanisms.

  4. textbf Transient State Evolution Modeler (TSEM) for Section 5: The AI can model the reshaping of electronic structure by simulating Floquet dressing, allowing it to predict the formation of photon-dressed replica bands and open gaps where these replicas hybridize, enabling control over transient phases.

  5. textbf Resonant Collective-Mode Controller (RCMC) utilizing Section 5.2: The system can implement an indirect control strategy by calculating the necessary auxiliary mode excitation required to achieve a target state, mimicking how resonant excitation of a higher-frequency infrared-active phonon instead couples anharmonically to the ferroelectric coordinate induces polarization reversal in LiNbO3.

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