Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session D01: Quantum Tools for Chemistry and Chemistry for Quantum Tools IFocus Recordings Available
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Sponsoring Units: DCP Chair: Eric Hudson, UCLA Room: McCormick Place W-175A |
Monday, March 14, 2022 3:00PM - 3:36PM |
D01.00001: Control of electronic structure and spin in molecular f-block complexes and qubit candidates Invited Speaker: Polly Arnold The creation and control of coherence in a quantum object, or "qubit", is possible for molecules containing a spin (electron or nuclear), in the same way as for NV centers or ultracold ion arrays in the wider field of quantum information science (QIS). |
Monday, March 14, 2022 3:36PM - 4:12PM |
D01.00002: Quantum state-resolved collisions of cold trapped negative ions Invited Speaker: Roland Wester Negative molecular ions have drawn a lot of attention in recent years, because of their detection in interstellar space and of opportunities to use laser-cooled anions to cool antiproton. Cryogenic radiofrequency ion traps are well suited tools to study the quantum states and state-selected chemistry of negative ions. Using photodetachment spectroscopy we have probed rotational quantum states of cold trapped anions and studied rotational state-changing collisions at low temperature. This also allowed us to perform rotational terahertz spectroscopy and infrared overtone spectroscopy. We have further studied photodetachment of two interstellar anions near threshold. For CN- the measurements are well described by Wigner's threshold law. For C3N- the large permanent dipole moment of C3N leads to a qualitatively different cross section behavior. Furthermore, the rotational contour of a dipole bound state was resolved slightly below the detachment threshold in agreement with calculations. This state could serve as a doorway state to negative ion formation in interstellar clouds. Recently, we have developed a two-photon scheme to probe rotational and vibrational states of the homonuclear anion C2-, a candidate proposed for negative ion laser cooling. Results on electronic spectroscopy and vibrational relaxation collisions of this ion will be presented. |
Monday, March 14, 2022 4:12PM - 4:48PM |
D01.00003: AMO physics in a beaker: Liquid quantum cells as analogs to atomic vapor cells Invited Speaker: Justin R Caram Trivalent lanthanides display "atomic-like" optical transitions in condensed phase environments. However, despite inorganic lanthanide complexes being explored as potential spin-qubits, their narrow optical transitions have not been employed to prepare or readout quantum states. We demonstrate a ligand system which supports ultranarrow optical linewidths in a dense liquid at room temperature. Leveraging the high concentrations afforded by liquid solvation, we utilize a narrowband laser to optically prepare and readout a significant fraction of these floating spins. We demonstrate the ability to measure weak EM fields through changes in transmission and optical polarization, in direct analogy to atomic vapor cell technology. The high density of spins also suggests the potential for entanglement enhancement in quantum sensing. |
Monday, March 14, 2022 4:48PM - 5:00PM |
D01.00004: Evidence of Polaritonic Intensity Borrowing in a Strongly Coupled Metalloporphyin-Cavity System Aaron Rury, Aleksandr Avramenko, Adedayo Sanni The strong coupling of cavity photons to the frontier molecular electrons leads to the formation of delocalized cavity polariton states. These delocalized, hybrid light-matter excitations enable novel mechanisms to control energy and charge transfer. While most of the focus on polariton formation deals with mechanistic understanding of how strong light-molecule coupling leverages photonic character to affect molecules, much less effort has been put into understanding how molecular properties can impact polaritonic behavior. Using a simple three level, Tavis-Cummings model, we show vibronic coupling between the B and Q states of a molecule like copper (II) tetratephenyl porphyrin (CuTPP) drives formation of a weakly dispersive, Q-like state. We fabricated and characterized single and multilayer cavity polariton samples using CuTPP and find the PL spectra of these samples in the region near the moleculess Q fluorescence contains light emission peaks consistent with the predictions of our simple theory. We consider explanations of the variations in the peak characteristics in different multilayer samples. Our results demonstrate how one can use the intrinsic properties of molecules to enable the formation of novel, light-like states and multi-mode photon-photon interactions in cavity polariton samples. |
Monday, March 14, 2022 5:00PM - 5:12PM |
D01.00005: Potentiometric Detection of Single Nanoparticle Collision Events on a Surface Functionalized Gold Nanoelectrode. Govinda Ghimire, Jin He The development of label-free single-entity measurement methods is important for the fundamental studies and applications of biophysics. Recently, we have demonstrated that various nanoparticles and proteins can be detected individually based on the open circuit potential (OCP) changes induced by their collision events on a floating carbon nanoelectrode. However, the carbon nanoelectrode is chemically inert and limited in surface functionalization. Here, I will present our recent progress of using surface-functionalized gold nanoelectrode (GNE) to replace carbon nanoelectrode for potentiometric single-entity studies. The surface functionalization of GNE also enables surface-enhanced Raman spectroscopy (SERS) measurements. However, the gold surface is more likely to be contaminated due to non-specific adsorption making them less suitable for continuous detection of single-entity hit-n-run collision signals. By utilizing the advantage of mixed surface functionalization of GNE with the Raman reporter molecule and polyethylene glycol or zwitterionic molecules, we formed near ‘stealth’ GNE surface and demonstrated that the non-specific adsorptions of nanoparticles to the GNE surface can be minimized, allowing continuous hit-n-run events for over 30 minutes. Also, by using simultaneous time-resolved OCP and SERS measurements, both the OCP and SERS signals induced by the hit-n-run type of collision events can be better understood. |
Monday, March 14, 2022 5:12PM - 5:24PM |
D01.00006: Reversible photo-switching of light-molecule coupling and chemical reaction modification in an optical microcavity Hongfei Zeng, Christopher T Eckdahl, Pufan Liu, Wooje Chang, Emily A Weiss, Julia A Kalow, Nathaniel P Stern Organic photoswitches, molecules able to isomerize upon light irradiation, have applications in nano- and optoelectronics such as photoswitchable transistors, optical data storage, and sensors. Fulgide photoswitches are particularly attractive due to large spectral separation between their open and closed isomers and their ultrafast isomerization timescales. Here, we achieve strong light-matter coupling at room temperature by placing fulgides inside a Fabry Pérot cavity resonant with the closed isomer visible absorption. A large Rabi splitting is observed in reflection, indicating the emergence of hybrid polariton states. The coupling strength between molecules and photons can be reversibly and continuously tuned upon visible and UV irradiation, ranging from no coupling to strong coupling. Kinetics studies reveal the acceleration of photoisomerization in the strong coupling regime. Our results demonstrate tunable light-matter coupling strength as well as modification of a chemical reaction using all-optical control. |
Monday, March 14, 2022 5:24PM - 6:00PM |
D01.00007: tbd Invited Speaker: Kang-Kuen Ni
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