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Energy Relaxation and Dynamics in the Correlated Metal ${Sr}_{2} {RuO}_{4}$ via Terahertz Two-Dimensional Coherent Spectroscopy

https://doi.org/10.1103/PhysRevLett.134.036501

Barbalas, David; Romero, Ralph; Chaudhuri, Dipanjan; Mahmood, Fahad; Nair, Hari_P; Schreiber, Nathaniel_J; Schlom, Darrell_G; Shen, K. M.; Armitage, N. P. (January 2025, Physical Review Letters)
Anomalous Frequency and Temperature Dependent Scattering in the Dilute Metallic Phase in Lightly Doped ${SrTiO}_{3}$

https://doi.org/10.1103/PhysRevLett.133.136003

Kumar, K_Santhosh; Lee, Dooyong; Varshney, Shivasheesh; Jalan, Bharat; Armitage, N. P. (September 2024, Physical Review Letters)
Coupled Metamaterial–Phonon Terahertz Range Polaritons in a Topological Insulator

https://doi.org/10.1021/acsphotonics.3c01879

Mekonen, Sirak M; Jain, Deepti; Oh, Seongshik; Armitage, N P (June 2024, ACS Photonics)

We report terahertz time-domain spectroscopy experiments demonstrating strong light–matter coupling in a terahertz LC metamaterial (MM) in which the phonon resonance of a topological insulator thin film is coupled to the photonic modes of an array of electronic split ring resonators. As we tune the MM resonance frequency through the frequency of the low-frequency α mode of (BixSb1–x)2Te3 (BST), we observe strong mixing and level repulsion between the phonon and MM resonance. This hybrid resonance is a phonon polariton. We observe a normalized coupling strength, η = ΩR/ωc ≈ 0.09, using the measured vacuum Rabi frequency and cavity resonance. Our results demonstrate that one can tune the mechanical properties of these materials by changing their electromagnetic environment and therefore modify their magnetic and topological degrees of freedom via coupling to the lattice in this fashion.
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Revealing Novel Aspects of Light-Matter Coupling by Terahertz Two-Dimensional Coherent Spectroscopy: The Case of the Amplitude Mode in Superconductors

https://doi.org/10.1103/PhysRevLett.132.256903

Katsumi, Kota; Fiore, Jacopo; Udina, Mattia; Romero, Ralph; Barbalas, David; Jesudasan, John; Raychaudhuri, Pratap; Seibold, Goetz; Benfatto, Lara; Armitage, N. P. (June 2024, Physical Review Letters)
Anomalously small superconducting gap in a strong spin-orbit coupled superconductor: $β$ -tungsten

https://doi.org/10.1103/PhysRevB.105.L060503

Chauhan, Prashant; Budhani, Ramesh; Armitage, N. P. (February 2022, Physical Review B)

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Evolution of the cyclotron mass with doping in ${La}_{2 - x} {Sr}_{x} {CuO}_{4}$

https://doi.org/10.1103/PhysRevB.106.195110

Legros, A.; Post, K. W.; Chauhan, Prashant; Rickel, D. G.; He, Xi; Xu, Xiaotao; Shi, Xiaoyan; Božović, Ivan; Crooker, S. A.; Armitage, N. P. (November 2022, Physical Review B)

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Optical investigation of the heavy-fermion normal state in superconducting ${UTe}_{2}$

https://doi.org/10.1103/PhysRevB.106.085125

Mekonen, Sirak M.; Kang, Chang-Jong; Chaudhuri, Dipanjan; Barbalas, David; Ran, Sheng; Kotliar, Gabriel; Butch, Nicholas P.; Armitage, N. P. (August 2022, Physical Review B)

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BCS $d$ -wave behavior in the terahertz electrodynamic response of electron-doped cuprate superconductors

https://doi.org/10.1103/PhysRevB.104.064501

Tagay, Zhenisbek; Mahmood, Fahad; Legros, Anaelle; Sarkar, Tarapada; Greene, Richard L.; Armitage, N. P. (August 2021, Physical Review B)

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Observation of a marginal Fermi glass

https://doi.org/10.1038/s41567-020-01149-0

Mahmood, Fahad; Chaudhuri, Dipanjan; Gopalakrishnan, Sarang; Nandkishore, Rahul; Armitage, N. P. (April 2021, Nature Physics)
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Separated transport relaxation scales and interband scattering in thin films of ${SrRuO}_{3}$ , ${CaRuO}_{3}$ , and ${Sr}_{2} {RuO}_{4}$

https://doi.org/10.1103/PhysRevB.103.205109

Wang, Youcheng; Nair, H. P.; Schreiber, N. J.; Ruf, J. P.; Cheng, Bing; Schlom, D. G.; Shen, K. M.; Armitage, N. P. (May 2021, Physical Review B)

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