Andrey Grankin

Signatures of quantum chaos in phonon-polariton billiards

D. N. Basov, Yinan Dong, Felix Liu, Ekrem S. Demirboğa et autres

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Bogolyubov excitons as a microscopic origin of two-level systems

Andrey Grankin, Victor Galitski

Two-level systems (TLS) are a leading source of decoherence and dielectric loss in Josephson-junction qubits, yet their microscopic origin remains unresolved. We propose an intrinsic, purely electronic TLS candidate: subgap bound states of Bogolyubov quasiparticles. We show that, in a model of …

Bogolyubov excitons as a microscopic origin of two-level systems

Andrey Grankin, Victor Galitski

Two-level systems (TLS) are a leading source of decoherence and dielectric loss in Josephson-junction qubits, yet their microscopic origin remains unresolved. We propose an intrinsic, purely electronic TLS candidate: subgap bound states of Bogolyubov quasiparticles. We show that, in a model of …

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Signatures of quantum chaos in phonon-polariton billiards

Yinan Dong, Felix Liu, Ekrem Demirboga, Andrey Grankin et autres

We use scanning near-field optical microscopy to image hyperbolic phonon polaritons in hexagonal boron nitride (hBN) billiards with integrable and chaotic geometries. In Sinai billiards, we observe irregular mode patterns consistent with quantum scarring, together with an unexpected sensitivity to weak probe …

Signatures of quantum chaos in phonon-polariton billiards

Yinan Dong, Felix Liu, Ekrem Demirboga, Andrey Grankin et autres

We use scanning near-field optical microscopy to image hyperbolic phonon polaritons in hexagonal boron nitride (hBN) billiards with integrable and chaotic geometries. In Sinai billiards, we observe irregular mode patterns consistent with quantum scarring, together with an unexpected sensitivity to weak probe …

Tunable viscosity across the BCS-BEC crossover

Yunxiang Liao, Andrey Grankin, Archisman Panigrahi, Victor Galitski et autres

Tunable interactions make ultracold quantum gases a unique platform for exploring hydrodynamic properties in the strongly correlated regime. Of particular interest are turbulent flows possible in the regime of high Reynolds numbers. Since the system size and flow velocity are limited in …

Tunable viscosity across the BCS-BEC crossover

Yunxiang Liao, Andrey Grankin, Archisman Panigrahi, Victor Galitski et autres

Tunable interactions make ultracold quantum gases a unique platform for exploring hydrodynamic properties in the strongly correlated regime. Of particular interest are turbulent flows possible in the regime of high Reynolds numbers. Since the system size and flow velocity are limited in …

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Fluctuation engineering in cavity quantum materials

Hope M Bretscher, Lorenzo Graziotto, Marios H Michael, Angela Montanaro et autres

Coupling tailored electromagnetic fluctuations to materials provides a resource for controlling correlated quantum matter. By structuring the frequency, spatial, and modal distribution of fluctuations through a new generation of cavity quantum materials, vacuum and thermal spectra can shift phase boundaries and stabilize …

Fluctuation engineering in cavity quantum materials

Hope M Bretscher, Lorenzo Graziotto, Marios H Michael, Angela Montanaro et autres

Coupling tailored electromagnetic fluctuations to materials provides a resource for controlling correlated quantum matter. By structuring the frequency, spatial, and modal distribution of fluctuations through a new generation of cavity quantum materials, vacuum and thermal spectra can shift phase boundaries and stabilize …

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Negative superfluid density and spatial instabilities in driven superconductors

Andrey Grankin, Victor Galitski, Vadim Oganesyan

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Fractional Chern insulator edges: crystalline effects and optical measurements

Yanqi Wang, Johannes Motruk, Andrey Grankin, Mohammad Reza Hafezi

Edge states of chiral topologically ordered phases are commonly described by chiral Luttinger liquids, effective theories that are exact only in the hydrodynamic limit. Motivated by recent bulk observations of fractional Chern insulators (FCIs) in two-dimensional materials and by synthetic realizations in …

Diagnosing Electronic Phases of Matter Using Photonic Correlation Functions

Gautam Nambiar, Andrey Grankin, Mohammad Reza Hafezi

In the past couple of decades, there have been significant advances in measuring quantum properties of light, such as quadratures of squeezed light and single-photon counting. Here, we explore whether such tools can be leveraged to probe electronic correlations in the many-body …

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