Publications by Frank Schlawin


Cavity-Mediated Electron-Photon Superconductivity.

Physical review letters 122 (2019) 133602-

F Schlawin, A Cavalleri, D Jaksch

We investigate electron paring in a two-dimensional electron system mediated by vacuum fluctuations inside a nanoplasmonic terahertz cavity. We show that the structured cavity vacuum can induce long-range attractive interactions between current fluctuations which lead to pairing in generic materials with critical temperatures in the low-kelvin regime for realistic parameters. The induced state is a pair-density wave superconductor which can show a transition from a fully gapped to a partially gapped phase-akin to the pseudogap phase in high-T_{c} superconductors. Our findings provide a promising tool for engineering intrinsic electron interactions in two-dimensional materials.


Manipulating quantum materials with quantum light

PHYSICAL REVIEW B 99 (2019) ARTN 085116

M Kiffner, JR Coulthard, F Schlawin, A Ardavan, D Jaksch


Coherence turned on by incoherent light

NEW JOURNAL OF PHYSICS 20 (2018) ARTN 113040

VN Shatokhin, M Walschaers, F Schlawin, A Buchleitner


Entangled Two-Photon Absorption Spectroscopy.

Accounts of chemical research 51 (2018) 2207-2214

F Schlawin, KE Dorfman, S Mukamel

The application of quantum states of light such as entangled photons, for example, created by parametric down conversion, has experienced tremendous progress in the almost 40 years since their first experimental realization. Initially, they were employed in the investigation of the foundations of quantum physics, such as the violation of Bell's inequalities and studies of quantum entanglement. They later emerged as basic platforms for quantum communication protocols and, in the recent experiments on single-photon interactions, in photonic quantum computation. These applications aim at the controlled manipulation of the photonic degrees of freedom, and therefore rely on simple models of matter, where the analysis is simpler. Furthermore, quantum imaging with entangled light can achieve enhanced resolution, and quantum metrology can overcome the shot noise limit for classical light. This Account focuses on an entirely different emerging class of applications using quantum light as a powerful spectroscopic tool to reveal novel information about complex molecules. These applications utilize two appealing properties of quantum light: its distinct intensity fluctuations and its nonclassical bandwidth properties. These give rise to new and surprising behavior of nonlinear optical signals. Nonclassical intensity fluctuations can enhance nonlinear optical signals relative to linear absorption. For instance, the two-photon absorption of entangled photon pairs scales linearly (rather than quadratically) in the photon flux, just like a single photon absorption. This enables nonlinear quantum spectroscopy of photosensitive, for example, biological, samples at low light intensities. We will discuss how the two-photon absorption cross section becomes a function of the photonic quantum state, which can be manipulated by properties of the entangled photon pairs. In addition, the quantum correlations in entangled photon states further influence the nonlinear signals in a variety of ways. Apart from affecting the signal's scaling with intensity, they also constitute an entirely new approach to shaping and controlling excitation pathways in molecular aggregates in a way that cannot be achieved with shaped classical pulses. This is because between the two absorption events in entangled two-photon absorption, the light and material system are entangled. Classical constraints for the simultaneous time and frequency resolution can thus be circumvented, since the two are not Fourier conjugates. Here we review the simplest manifestation of quantum light spectroscopy, two-photon absorption spectroscopy with entangled photons. This will allow us to discuss exemplarily the impact of quantum properties of light on a nonlinear optical signal and explore the opportunities for future applications.


Nonlinear optical molecular spectroscopy with quantum light in microcavities

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 256 (2018)

S Mukamel, K Dorfman, F Schlawin, Z Zhang, M Kowalewski, K Bennett


Entangled photon spectroscopy

Journal of Physics B: Atomic, Molecular and Optical Physics 50 (2017)

F Schlawin

© 2017 IOP Publishing Ltd. This tutorial outlines the theory of nonlinear spectroscopy with quantum light, and in particular with entangled photons. To this end, we briefly review molecular quantum electrodynamics, and discuss the approximations involved. Then we outline the perturbation theory underlying nonlinear spectroscopy. In contrast to the conventional semiclassical theory, our derivation starts from Glauber's photon counting formalism, and naturally includes the semiclassical theory as a special case. Finally, we review previous work, which we sort into work depending on the unusual features of quantum noise, and work relying upon quantum correlations in entangled photons. This work naturally draws from both quantum optics and chemical physics. Even though it is impossible to provide a comprehensive overview of both fields in one tutorial, this text aims to be self-contained. We refer to specialised reviews, where we cannot provide details. We do not attempt to provide an exhaustive review of all the literature, but rather focus on specific examples intended to elucidate the underlying physics, and merely cite the remaining publications.


Theory of coherent control with quantum light

NEW JOURNAL OF PHYSICS 19 (2017) ARTN 013009

F Schlawin, A Buchleitner


Terahertz field control of interlayer transport modes in cuprate superconductors

PHYSICAL REVIEW B 96 (2017) ARTN 064526

F Schlawin, ASD Dietrich, M Kiffner, A Cavalleri, D Jaksch


Nonlinear optical signals and spectroscopy with quantum light

REVIEWS OF MODERN PHYSICS 88 (2016) ARTN 045008

KE Dorfman, F Schlawin, S Mukamel


Pump-probe spectroscopy using quantum light with two-photon coincidence detection

PHYSICAL REVIEW A 93 (2016) ARTN 023807

F Schlawin, KE Dorfman, S Mukamel


Quantum Transport on Disordered and Noisy Networks: An Interplay of Structural Complexity and Uncertainty

ANNUAL REVIEW OF CONDENSED MATTER PHYSICS, VOL 7 7 (2016) 223-248

M Walschaers, F Schlawin, T Wellens, A Buchleitner


A Non time Ordered Pulse Scanning Protocol for Multidimensional Spectroscopy with Entangled Light

ULTRAFAST PHENOMENA XIX 162 (2015) 436-439

KE Dorfman, F Schlawin, S Mukamel


Nonlinear spectroscopy of trapped ions (vol 90, 023603, 2014)

PHYSICAL REVIEW A 92 (2015) ARTN 039903

F Schlawin, M Gessner, S Mukamel, A Buchleitner


Nonlinear spectroscopy of controllable many-body quantum systems (vol 16, 092001, 2014)

NEW JOURNAL OF PHYSICS 17 (2015) ARTN 019601

M Gessner, F Schlawin, H Haeffner, S Mukamel, A Buchleitner


Probing polariton dynamics in trapped ions with phase-coherent two-dimensional spectroscopy.

The Journal of chemical physics 142 (2015) 212439-

M Gessner, F Schlawin, A Buchleitner

We devise a phase-coherent three-pulse protocol to probe the polariton dynamics in a trapped-ion quantum simulation. In contrast to conventional nonlinear signals, the presented scheme does not change the number of excitations in the system, allowing for the investigation of the dynamics within an N-excitation manifold. In the particular case of a filling factor one (N excitations in an N-ion chain), the proposed interaction induces coherent transitions between a delocalized phonon superfluid and a localized atomic insulator phase. Numerical simulations of a two-ion chain demonstrate that the resulting two-dimensional spectra allow for the unambiguous identification of the distinct phases, and the two-dimensional line shapes efficiently characterize the relevant decoherence mechanism.


Recent developments in multidimensional spectroscopy of molecules using attosecond X-ray pulses and quantum light

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 248 (2014)

S Mukamel, K Dorfman, B Fingerhut, Y Zhang, F Schlawin, J Biggs, W Hua


Nonlinear spectroscopy of controllable many-body quantum systems

NEW JOURNAL OF PHYSICS 16 (2014) ARTN 092001

M Gessner, F Schlawin, H Haeffner, S Mukamel, A Buchleitner


Multidimensional spectroscopy with entangled light; A novel pulse scanning protocol

Optics InfoBase Conference Papers (2014)

KE Dorfman, F Schlawin, S Mukamel

Quantum light can induce correlations in photo excited molecules and probe them with unusual spectral and temporal resolution. A new non-time-ordered pulse delay scanning protocol in multidimensional signals reveals resonances not accessible by standard techniques. © 2014 OSA.


Nonlinear spectroscopy of trapped ions

PHYSICAL REVIEW A 90 (2014) ARTN 023603

F Schlawin, M Gessner, S Mukamel, A Buchleitner


Matter correlations induced by coupling to quantum light

PHYSICAL REVIEW A 89 (2014) ARTN 013830

F Schlawin, S Mukamel

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