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| --- | ||
| name: Dennis Clougherty | ||
| first_name: Dennis | ||
| last_name: Clougherty | ||
| asociation: University of Vermont | ||
| #status: invited | ||
| --- |
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| name: Felipe Recabal | ||
| first_name: Felipe | ||
| last_name: Recabal | ||
| asociation: Universidad de Santiago de Chile | ||
| --- |
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| name: Herbert Diaz | ||
| first_name: Herbert | ||
| last_name: Díaz | ||
| asociation: Pontificia Universidad Católica de Chile | ||
| --- |
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| --- | ||
| name: Michael Shatruk | ||
| first_name: Michael | ||
| last_name: Shatruk | ||
| asociation: Florida State University | ||
| --- |
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| name: Micheline Soley | ||
| first_name: Micheline | ||
| last_name: Soley | ||
| asociation: University of Wisconsin-Madison | ||
| #status: invited | ||
| --- |
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| name: Ruth Tichauer | ||
| first_name: Ruth | ||
| last_name: Tichahuer | ||
| asociation: Universidad Autónoma de Madrid | ||
| #status: invited | ||
| --- |
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| name: Jose Sanz-Vicario | ||
| first_name: José Luis | ||
| last_name: Sanz-Vicario | ||
| asociation: Universidad de Antioquia | ||
| # status: invited | ||
| --- |
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| name: Tunable Spin Dynamics with Ultracold Polar Molecules | ||
| speakers: | ||
| - Annette Carroll | ||
| categories: | ||
| - Talk | ||
| --- | ||
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| Ultracold molecules enable exploration of many-body physics due to their highly tunable dipolar interactions. Here, I will review our recent observations of out-of-equilibrium spin dynamics with polar molecules. With spin encoded in the lowest rotational states of the molecules, we realized a generalized t-J model with dipolar interactions [1]. We explored the role of Ising and spin-exchange couplings tuned with dc electric fields and the eLect of motion regulated by optical lattices on Ramsey contrast decay. Theoretical understanding of the experimental measurements will also be discussed. Further, we realized XXZ spin models with Floquet engineering [2] and verified that they produced similar dynamics as those controlled by dc electric fields. We additionally used Floquet engineering to realize a two-axis twisting Hamiltonian, inaccessible with static fields, and studied its mean-field dynamics. This work sets the stage for future explorations of exotic spin Hamiltonians with the tunability of molecular platforms. | ||
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| [1] A. N. Carroll et al., Observation of Generalized T-J Spin Dynamics with Tunable Dipolar Interactions, arXiv:2404.18916. | ||
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| [2] C. Miller, A. N. Carroll, J. Lin, H. Hirzler, H. Gao, H. Zhou, M. D. Lukin, and J. Ye, Two-Axis Twisting Using Floquet-Engineered XYZ Spin Models with Polar Molecules, Nature (2024). |
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| --- | ||
| name: Organic Molecules in Solids for Photonic Quantum Technologies | ||
| speakers: | ||
| - Constanza Toninelli | ||
| categories: | ||
| - Talk | ||
| --- | ||
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| In this contribution, the generation of quantum states of light from single molecules is discussed, tailored to multiple and diverse applications. We will focus on the use of polycyclic aromatic hydrocarbons (PAH), embedded in host matrices [1]. These molecules, due to their small size and well-defined properties, serve as nanoscopic sensors for pressure, strain, temperature, and various fields. The talk discusses recent advancements in coupling single PAH molecules to photonic structures to enhance and control their interaction with light [2]. Notably, two-photon interference experiments between photons emitted by diLerent molecules on the same chip are presented, addressing a fundamental challenge in solid-state platforms for photonic quantum technologies [3]. The experiment relies on multiple milestones, including addressing several molecules simultaneously as on-demand single-photon sources [4], independently tuning their frequencies optically [5,6], and conducting real-time measurements of two-photon interference [3,7]. Additionally, the presentation explores the use of organic molecules as nanoscopic thermal sensors, enabling semi- invasive local temperature measurements in a temperature range (3 K to 30 K) unattainable by most commercial technologies [8]. These results oLer insights into the local phononic environment in complex structures and an unexplored temperature regime. Finally, we will comment on the new prospects of using single molecules as interfaces between spin, optical and mechanical degrees of freedom. | ||
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| [1] C. Toninelli et al., Nat. Mat. 20, (2021) | ||
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| [2] M. Colautti et al., Ad.Q.Tech. 3, (2020) | ||
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| [3] R. Duquennoy et al., Optica 9, 731-737, (2022) | ||
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| [4] P. Lombardi et al., Ad.Q.Tec. 3, (2020) | ||
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| [5] M. Colautti, et al., ACS Nano 14, 13584−13592 (2020) | ||
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| [6] R. Duquennoy et al., ACS Nano18, 32508−32516 (2024) | ||
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| [7] R. Duquennoy et al., Phys. Rev. Research 5, 023191 (2023) | ||
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| [8] V. Esteso et al., Phys. Rev. X Quantum 4, 040314 (2023). |
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| --- | ||
| name: Quantum ergodicity and energy flow in molecules | ||
| speakers: | ||
| - David Leitner | ||
| categories: | ||
| - Talk | ||
| --- | ||
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| Under what conditions does a molecule thermalize under its own internal dynamics, and if it does how long does it take? I will discuss a theoretical framework, local random matrix theory, that establishes criteria for quantum ergodicity and energy flow in the vibrational state space of large molecules. I will also discuss some of the ways in which both limitations to and the rate of energy flow in the vibrational state space impact the kinetics of conformational isomerization in gas and condensed phase [1], reactions involving molecules attached to plasmonic nanoparticles [2], as well as thermal conductance of molecular junctions [3], which can now be measured for single molecules [4]. Comparison with results of a variety of experiments will be discussed. | ||
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| [1.] Leitner, D. M. Quantum ergodicity and energy flow in molecules. Adv. Phys. 2015, 64, 445 - 517. | ||
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| [2.] Poudel, H.; Shaon, P. H.; Leitner, D. M. Vibrational Energy Flow in Molecules Attached to Plasmonic Nanoparticles. J. Phys. Chem. C 2024, 128, 8628 - 8636. | ||
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| [3.] Reid, K. M.; Pandey, H. D.; Leitner, D. M. Elastic and inelastic contributions to thermal transport between chemical groups and thermal rectification in molecules. J. Phys. Chem. C 2019, 6256 - 6264. | ||
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| [4.] Cui, L.; Hur, S.; Zkbar, Z. A.; Klöckner, J. C.; Jeong, W.; Pauly, F.; Jang, S.-Y.; Reddy, P.; Meyhofer, E. Thermal conductance of single-molecule junctions. Nature 2019, 572, 628 - 633. |
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| name: Variational approach to atom-membrane dynamics | ||
| speakers: | ||
| - Dennis Clougherty | ||
| categories: | ||
| - Talk | ||
| --- | ||
| The adsorption of cold atoms to a surface differs in many ways from the adsorption of atoms at higher energies. It has been established both theoretically [1] and experimentally [2] that the adsorption rate of cold atoms can be dramatically suppressed in comparison to rates at higher energies by two quantum mechanical effects: (1) quantum reflection of the cold atoms away from the surface, and (2) a phonon orthogonality catastrophe [3] resulting from the surface displacement that accompanies adsorption. The first effect is a single particle phenomenon that depends on the wave mechanics of the cold atoms; the second effect is a many-body phenomenon that results from the behavior of the phonon matrix element between the initial and final states of the surface. In the most extreme case of adsorption on a 2D material, it has been proposed that this phonon reduction factor can completely suppress cold atom adsorption [4]. | ||
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| A time-dependent, nonperturbative description of phonon-assisted cold atom adsorption on a membrane will be presented. Using the Dirac-Frenkel variational principle, closed-form expressions for adsorption rates can be obtained. One strength of this method is that the case of intermediate atom-phonon coupling can be treated where the adsorption rate is found to change discontinuously with atom-phonon coupling strength at low membrane temperatures. The framework presented can be customized in a straightforward way to describe a variety of reactions in the quantum regime. Possible applications of these results to emerging quantum technologies will also be discussed. | ||
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| [1] Dennis P. Clougherty and W. Kohn, Phys. Rev. B, 46, 4921 (1992). | ||
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| [2] I. A. Yu, J. M. Doyle, J. C. Sandberg, C. L. Cesar, D. Kleppner, and T. J. Greytak, Phys. Rev. Lett. 71, 1589 (1993). | ||
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| [3] Dennis P. Clougherty and Yanting Zhang, Phys. Rev. Lett. 109, 120401 (2012). | ||
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| [4] Dennis P. Clougherty, Phys. Rev. B, 96, 235404 (2017); Sanghita Sengupta and Dennis P. Clougherty, J. Phys.: Conf. Ser., 1148, 012007 (2018). |
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| name: Driven-dissipative change transport in small networks; negative conductance and light-induced currents | ||
| name: Non-canonical steady state of two coupled oscillators in the strong coupling regime | ||
| speakers: | ||
| - Felipe Recabal | ||
| categories: | ||
| - Talk | ||
| --- | ||
| Felipe Recabal (a) and Felipe Herrera (a,b) | ||
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| (a) Department of Physics, Universidad de Santiago de Chile, Santiago, Chile | ||
| In a previous work, we describe the suppression of reaction rate inside a cavity where the electromagnetic vacuum is in strong coupling with an ensemble of molecule [1]. We model the system through a master equation where the local-Lindblad terms describe the relaxation processes of the cavity mode and the molecular vibrational modes. We show that local- Lindblad theory is necessary to obtain a non-canonical steady state for the system that describes the reaction rate suppression. Meanwhile, Redfield master equation in the system eigenbasis leads to canonical steady state that does not capture the resonant behavior. | ||
| Based on the previous discussion, in the work we microscopically derive a master equation for two coupled harmonic oscillators in the strong coupling regime (see Fig.1(a)). The derivation considers weak coupling and Born-Markov approximation for the system-bath interaction. The master equation obtained contains local terms, that describes relaxation, and non-local terms, due to include the oscillator coupling in the derivation [2,3]. Results shows that the non-local terms are associate to production of coherences induced by the baths, leading the system to a canonical steady state. When the non-local terms are neglected, the system have a non-canonical steady state, with results that agree with the resonant behavior observed using local Lindblad master equation (see Fig.1(b)). Possible ways to neglect the non-local terms are discussed, including tuning temperature and energy detuning, and the inclusion of non-linear system bath interactions. | ||
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| (b) Millennium Institute for Research in Optics (MIRO), Chile | ||
| [1] W. Ahn, J. F. Triana, F. Recabal, F. Herrera & B. S. Simpkins, Science, 380(6650), 1165- 1168 (2023). | ||
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| Nanojunction experiments with single molecules or quantum dots placed between macroscopic leads allow the exploration of quantum transport at the nanoscale [1]. We model these systems adopting a Markovian open-quantum system approach to compute the current-voltage response of small-size networks of interacting two-level conducting sites that are coupled to leads, and radiative and non-radiative reservoirs. We model the phenomenon of light-induced current, reported theoretically [2] and experimentally [3]. We validate our Markovian model by reproducing the experimental results on negative conductance [3] of single-molecule junctions with a two-site model in the absence of electromagnetic driving (Fig. 1). We show that Coulomb blocking of current can be neglected with an external electromagnetic driving source and non-radiative decay. At zero bias voltage, the photocurrent induced by the electromagnetic driving source has a direction that depends on the delocalized orbital. We finally extend these results by treating electron transport under vibrational strong coupling in an infrared cavity (Fig. 1c) and discuss possible verifications of our predictions in current experiments [5]. | ||
| [2] C. Joshi, et al., Phys. Rev. A, 90(6), 063815 (2014). | ||
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| **Figure 1.** (a) Dimer model. (b) Modelled (solid line) y experimental (dotted line) current-voltage curve of the molecule. (c) Splitting of vibrational levels by a cavity. Experimental data extracted from [5]. | ||
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| [1] M. Thoss, and F. Evers, J. Chem. Phys., 148, 030901 (2018). | ||
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| [2] M. Galperin, and A. Nitzan, Phys. Rev. Lett., 95, 206802 (2005). | ||
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| [3] J. Zhou, K. Wang, B. Xu, and Y. Dubi, J. Am. Chem. Soc., 140, 70-73 (2018). | ||
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| [4] M. Perrin, R. Frisenda, M. Koole, et al., Nat. Nanotechnol., 9, 830–834 (2014). | ||
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| [5] F. Herrera, and J. Owrutsky, J. Chem. Phys., 152, 100902 (2020). | ||
| [3] J. Sousa, et al., Phys. Rev. A, 106(3), 032401 (2022). |
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