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Loic Anderegg - One of the best experts on this subject based on the ideXlab platform.
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Direct Laser Cooling of a Symmetric Top Molecule
Science (New York N.Y.), 2020Co-Authors: Debayan Mitra, Louis Baum, Benjamin L Augenbraun, Loic Anderegg, Nathaniel B. Vilas, Christian Hallas, Calder Miller, Shivam Raval, John M DoyleAbstract:Ultracold polyatomic molecules have potentially wide-ranging applications in quantum simulation and computation, particle physics, and quantum chemistry. For atoms and small molecules, direct Laser Cooling has proven to be a powerful tool for quantum science in the ultracold regime. However, the feasibility of Laser-Cooling larger, nonlinear polyatomic molecules has remained unknown because of their complex structure. We Laser-cooled the symmetric top molecule calcium monomethoxide (CaOCH3), reducing the temperature of ~104 molecules from 22 ± 1 millikelvin to 1.8 ± 0.7 millikelvin in one dimension and state-selectively Cooling two nuclear spin isomers. These results demonstrate that the use of proper ro-vibronic transitions enables Laser Cooling of nonlinear molecules, thereby opening a path to efficient Cooling of chiral molecules and, eventually, optical tweezer arrays of complex polyatomic species.
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direct Laser Cooling of a symmetric top molecule
arXiv: Atomic Physics, 2020Co-Authors: Debayan Mitra, Louis Baum, Benjamin L Augenbraun, Loic Anderegg, Nathaniel B. Vilas, Christian Hallas, Calder Miller, Shivam Raval, John M DoyleAbstract:We report direct Laser Cooling of a symmetric top molecule, reducing the transverse temperature of a beam of calcium monomethoxide (CaOCH$_3$) to $1.8\pm0.7$ mK while addressing two distinct nuclear spin isomers. These results open a path to efficient production of ultracold chiral molecules and conclusively demonstrate that by using proper rovibronic optical transitions, both photon cycling and Laser Cooling of complex molecules can be as efficient as for much simpler linear species.
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Laser Cooling of optically trapped molecules
Nature Physics, 2018Co-Authors: Benjamin L Augenbraun, Loic Anderegg, Yicheng Bao, Sean Burchesky, Lawrence CheukAbstract:Ultracold molecules are ideal platforms for many important applications, ranging from quantum simulation1–5 and quantum information processing 6,7 to precision tests of fundamental physics2,8–11. Producing trapped, dense samples of ultracold molecules is a challenging task. One promising approach is direct Laser Cooling, which can be applied to several classes of molecules not easily assembled from ultracold atoms12,13. Here, we report the production of trapped samples of Laser-cooled CaF molecules with densities of 8 × 107 cm−3 and at phase-space densities of 2 × 10−9, 35 times higher than for sub-Doppler-cooled samples in free space14. These advances are made possible by efficient Laser Cooling of optically trapped molecules to well below the Doppler limit, a key step towards many future applications. These range from ultracold chemistry to quantum simulation, where conservative trapping of cold and dense samples is desirable. In addition, the ability to cool optically trapped molecules opens up new paths towards quantum degeneracy. Laser Cooling of optically trapped diatomic molecules CaF to sub-Doppler temperatures has been achieved. The technique provides an alternative approach towards the production of ultracold polar molecules.
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sisyphus Laser Cooling of a polyatomic molecule
Physical Review Letters, 2017Co-Authors: Ivan Kozyryev, Louis Baum, Kyle Matsuda, Benjamin L Augenbraun, Loic Anderegg, Alexander Sedlack, John M DoyleAbstract:: We perform magnetically assisted Sisyphus Laser Cooling of the triatomic free radical strontium monohydroxide (SrOH). This is achieved with principal optical cycling in the rotationally closed P(N^{''}=1) branch of either the X[over ˜]^{2}Σ^{+}(000)↔A[over ˜]^{2}Π_{1/2}(000) or the X[over ˜]^{2}Σ^{+}(000)↔B[over ˜]^{2}Σ^{+}(000) vibronic transitions. Molecules lost into the excited vibrational states during the Cooling process are repumped back through the B[over ˜](000) state for both the (100) level of the Sr-O stretching mode and the (02^{0}0) level of the bending mode. The transverse temperature of a SrOH molecular beam is reduced in one dimension by 2 orders of magnitude to ∼750 μK. This approach opens a path towards creating a variety of ultracold polyatomic molecules by means of direct Laser Cooling.
John M Doyle - One of the best experts on this subject based on the ideXlab platform.
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Direct Laser Cooling of a Symmetric Top Molecule
Science (New York N.Y.), 2020Co-Authors: Debayan Mitra, Louis Baum, Benjamin L Augenbraun, Loic Anderegg, Nathaniel B. Vilas, Christian Hallas, Calder Miller, Shivam Raval, John M DoyleAbstract:Ultracold polyatomic molecules have potentially wide-ranging applications in quantum simulation and computation, particle physics, and quantum chemistry. For atoms and small molecules, direct Laser Cooling has proven to be a powerful tool for quantum science in the ultracold regime. However, the feasibility of Laser-Cooling larger, nonlinear polyatomic molecules has remained unknown because of their complex structure. We Laser-cooled the symmetric top molecule calcium monomethoxide (CaOCH3), reducing the temperature of ~104 molecules from 22 ± 1 millikelvin to 1.8 ± 0.7 millikelvin in one dimension and state-selectively Cooling two nuclear spin isomers. These results demonstrate that the use of proper ro-vibronic transitions enables Laser Cooling of nonlinear molecules, thereby opening a path to efficient Cooling of chiral molecules and, eventually, optical tweezer arrays of complex polyatomic species.
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direct Laser Cooling of a symmetric top molecule
arXiv: Atomic Physics, 2020Co-Authors: Debayan Mitra, Louis Baum, Benjamin L Augenbraun, Loic Anderegg, Nathaniel B. Vilas, Christian Hallas, Calder Miller, Shivam Raval, John M DoyleAbstract:We report direct Laser Cooling of a symmetric top molecule, reducing the transverse temperature of a beam of calcium monomethoxide (CaOCH$_3$) to $1.8\pm0.7$ mK while addressing two distinct nuclear spin isomers. These results open a path to efficient production of ultracold chiral molecules and conclusively demonstrate that by using proper rovibronic optical transitions, both photon cycling and Laser Cooling of complex molecules can be as efficient as for much simpler linear species.
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sisyphus Laser Cooling of a polyatomic molecule
Physical Review Letters, 2017Co-Authors: Ivan Kozyryev, Louis Baum, Kyle Matsuda, Benjamin L Augenbraun, Loic Anderegg, Alexander Sedlack, John M DoyleAbstract:: We perform magnetically assisted Sisyphus Laser Cooling of the triatomic free radical strontium monohydroxide (SrOH). This is achieved with principal optical cycling in the rotationally closed P(N^{''}=1) branch of either the X[over ˜]^{2}Σ^{+}(000)↔A[over ˜]^{2}Π_{1/2}(000) or the X[over ˜]^{2}Σ^{+}(000)↔B[over ˜]^{2}Σ^{+}(000) vibronic transitions. Molecules lost into the excited vibrational states during the Cooling process are repumped back through the B[over ˜](000) state for both the (100) level of the Sr-O stretching mode and the (02^{0}0) level of the bending mode. The transverse temperature of a SrOH molecular beam is reduced in one dimension by 2 orders of magnitude to ∼750 μK. This approach opens a path towards creating a variety of ultracold polyatomic molecules by means of direct Laser Cooling.
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Proposal for Laser Cooling of Complex Polyatomic Molecules.
Chemphyschem : a European journal of chemical physics and physical chemistry, 2016Co-Authors: Ivan Kozyryev, Louis Baum, Kyle Matsuda, John M DoyleAbstract:An experimentally feasible strategy for direct Laser Cooling of polyatomic molecules with six or more atoms is presented. Our approach relies on the attachment of a metal atom to a complex molecule, where it acts as an active photon cycling site. We describe a Laser Cooling scheme for alkaline earth monoalkoxide free radicals taking advantage of the phase space compression of a cryogenic buffer-gas beam. Possible applications are presented including Laser Cooling of chiral molecules and slowing of molecular beams using coherent photon processes.
Benjamin L Augenbraun - One of the best experts on this subject based on the ideXlab platform.
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Direct Laser Cooling of a Symmetric Top Molecule
Science (New York N.Y.), 2020Co-Authors: Debayan Mitra, Louis Baum, Benjamin L Augenbraun, Loic Anderegg, Nathaniel B. Vilas, Christian Hallas, Calder Miller, Shivam Raval, John M DoyleAbstract:Ultracold polyatomic molecules have potentially wide-ranging applications in quantum simulation and computation, particle physics, and quantum chemistry. For atoms and small molecules, direct Laser Cooling has proven to be a powerful tool for quantum science in the ultracold regime. However, the feasibility of Laser-Cooling larger, nonlinear polyatomic molecules has remained unknown because of their complex structure. We Laser-cooled the symmetric top molecule calcium monomethoxide (CaOCH3), reducing the temperature of ~104 molecules from 22 ± 1 millikelvin to 1.8 ± 0.7 millikelvin in one dimension and state-selectively Cooling two nuclear spin isomers. These results demonstrate that the use of proper ro-vibronic transitions enables Laser Cooling of nonlinear molecules, thereby opening a path to efficient Cooling of chiral molecules and, eventually, optical tweezer arrays of complex polyatomic species.
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direct Laser Cooling of a symmetric top molecule
arXiv: Atomic Physics, 2020Co-Authors: Debayan Mitra, Louis Baum, Benjamin L Augenbraun, Loic Anderegg, Nathaniel B. Vilas, Christian Hallas, Calder Miller, Shivam Raval, John M DoyleAbstract:We report direct Laser Cooling of a symmetric top molecule, reducing the transverse temperature of a beam of calcium monomethoxide (CaOCH$_3$) to $1.8\pm0.7$ mK while addressing two distinct nuclear spin isomers. These results open a path to efficient production of ultracold chiral molecules and conclusively demonstrate that by using proper rovibronic optical transitions, both photon cycling and Laser Cooling of complex molecules can be as efficient as for much simpler linear species.
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Laser Cooling of optically trapped molecules
Nature Physics, 2018Co-Authors: Benjamin L Augenbraun, Loic Anderegg, Yicheng Bao, Sean Burchesky, Lawrence CheukAbstract:Ultracold molecules are ideal platforms for many important applications, ranging from quantum simulation1–5 and quantum information processing 6,7 to precision tests of fundamental physics2,8–11. Producing trapped, dense samples of ultracold molecules is a challenging task. One promising approach is direct Laser Cooling, which can be applied to several classes of molecules not easily assembled from ultracold atoms12,13. Here, we report the production of trapped samples of Laser-cooled CaF molecules with densities of 8 × 107 cm−3 and at phase-space densities of 2 × 10−9, 35 times higher than for sub-Doppler-cooled samples in free space14. These advances are made possible by efficient Laser Cooling of optically trapped molecules to well below the Doppler limit, a key step towards many future applications. These range from ultracold chemistry to quantum simulation, where conservative trapping of cold and dense samples is desirable. In addition, the ability to cool optically trapped molecules opens up new paths towards quantum degeneracy. Laser Cooling of optically trapped diatomic molecules CaF to sub-Doppler temperatures has been achieved. The technique provides an alternative approach towards the production of ultracold polar molecules.
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sisyphus Laser Cooling of a polyatomic molecule
Physical Review Letters, 2017Co-Authors: Ivan Kozyryev, Louis Baum, Kyle Matsuda, Benjamin L Augenbraun, Loic Anderegg, Alexander Sedlack, John M DoyleAbstract:: We perform magnetically assisted Sisyphus Laser Cooling of the triatomic free radical strontium monohydroxide (SrOH). This is achieved with principal optical cycling in the rotationally closed P(N^{''}=1) branch of either the X[over ˜]^{2}Σ^{+}(000)↔A[over ˜]^{2}Π_{1/2}(000) or the X[over ˜]^{2}Σ^{+}(000)↔B[over ˜]^{2}Σ^{+}(000) vibronic transitions. Molecules lost into the excited vibrational states during the Cooling process are repumped back through the B[over ˜](000) state for both the (100) level of the Sr-O stretching mode and the (02^{0}0) level of the bending mode. The transverse temperature of a SrOH molecular beam is reduced in one dimension by 2 orders of magnitude to ∼750 μK. This approach opens a path towards creating a variety of ultracold polyatomic molecules by means of direct Laser Cooling.
Masaru Kuno - One of the best experts on this subject based on the ideXlab platform.
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Progress in Laser Cooling semiconductor nanocrystals and nanostructures
NPG Asia Materials, 2019Co-Authors: Shubin Zhang, Maksym Zhukovskyi, Boldizsár Jankó, Masaru KunoAbstract:Overview of up-conversion based condensed phase Laser Cooling of semiconductor nanostructures. Two critical parameters dictate the likelihood of realizing solid state optical refrigeration: nanostructure emission quantum yield and up-conversion efficiency. This review summarizes both parameters for existing high emission quantum yield semiconductor nanostructures such as CdSe and CsPbBr_3. CsPbBr_3 nanocrystals, in particular, possess optimal parameters for Cooling, namely near unity emission quantum yields and up-conversion efficiencies up to 75%. This makes them promising materials for verifiable demonstrations of condensed phase Laser Cooling.Semiconductors: Using light to cool solidsAdvances toward Cooling semiconductor nanostructures using light have been reviewed by researchers in the US. Laser light can cool clouds of atoms to ultralow temperatures. Cooling of solids works because when light absorbed by matter is re-emitted, it can carry some of the matter’s thermal energy with it. To date only gases have been successfully cooled to very low temperatures. Masaru Kuno and colleagues from the University of Notre Dame summarize why achieving the optical Cooling of solids is so difficult and how the properties of semiconductor nanocrystals might make Laser Cooling possible. The authors believe that Laser Cooling in semiconductors could be demonstrated in the near future, offering the potential for integrating this effect into optoelectronic devices.AbstractOver the past two decades, there have been sizable efforts to realize condensed phase optical Cooling. To date, however, there have been no verifiable demonstrations of semiconductor-based Laser Cooling. Recently, advances in the synthesis of semiconductor nanostructures have led to the availability of high-quality semiconductor nanocrystals, which possess superior optical properties relative to their bulk counterparts. In this review, we describe how these nanostructures can be used to demonstrate condensed phase Laser Cooling. We begin with a description of charge carrier dynamics in semiconductor nanocrystals and nanostructures under both above gap and below-gap excitation. Two critical parameters for realizing Laser Cooling are identified: emission quantum yield and upconversion efficiency. We report the literature values of these two parameters for different nanocrystal/nanostructure systems as well as the measurement approaches used to estimate them. We identify CsPbBr_3 nanocrystals as a potential system by which to demonstrate verifiable Laser Cooling given their ease of synthesis, near-unity emission quantum yields and sizable upconversion efficiencies. Feasibility is further demonstrated through numerical simulations of CsPbBr_3 nanocrystals embedded in an aerogel matrix. Our survey generally reveals that optimized semiconductor nanocrystals and nanostructures are poised to demonstrate condensed phase Laser Cooling in the near future.
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Progress in Laser Cooling semiconductor nanocrystals and nanostructures
NPG Asia Materials, 2019Co-Authors: Shubin Zhang, Maksym Zhukovskyi, Boldizsár Jankó, Masaru KunoAbstract:Abstract Over the past two decades, there have been sizable efforts to realize condensed phase optical Cooling. To date, however, there have been no verifiable demonstrations of semiconductor-based Laser Cooling. Recently, advances in the synthesis of semiconductor nanostructures have led to the availability of high-quality semiconductor nanocrystals, which possess superior optical properties relative to their bulk counterparts. In this review, we describe how these nanostructures can be used to demonstrate condensed phase Laser Cooling. We begin with a description of charge carrier dynamics in semiconductor nanocrystals and nanostructures under both above gap and below-gap excitation. Two critical parameters for realizing Laser Cooling are identified: emission quantum yield and upconversion efficiency. We report the literature values of these two parameters for different nanocrystal/nanostructure systems as well as the measurement approaches used to estimate them. We identify CsPbBr3 nanocrystals as a potential system by which to demonstrate verifiable Laser Cooling given their ease of synthesis, near-unity emission quantum yields and sizable upconversion efficiencies. Feasibility is further demonstrated through numerical simulations of CsPbBr3 nanocrystals embedded in an aerogel matrix. Our survey generally reveals that optimized semiconductor nanocrystals and nanostructures are poised to demonstrate condensed phase Laser Cooling in the near future.
Louis Baum - One of the best experts on this subject based on the ideXlab platform.
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Direct Laser Cooling of a Symmetric Top Molecule
Science (New York N.Y.), 2020Co-Authors: Debayan Mitra, Louis Baum, Benjamin L Augenbraun, Loic Anderegg, Nathaniel B. Vilas, Christian Hallas, Calder Miller, Shivam Raval, John M DoyleAbstract:Ultracold polyatomic molecules have potentially wide-ranging applications in quantum simulation and computation, particle physics, and quantum chemistry. For atoms and small molecules, direct Laser Cooling has proven to be a powerful tool for quantum science in the ultracold regime. However, the feasibility of Laser-Cooling larger, nonlinear polyatomic molecules has remained unknown because of their complex structure. We Laser-cooled the symmetric top molecule calcium monomethoxide (CaOCH3), reducing the temperature of ~104 molecules from 22 ± 1 millikelvin to 1.8 ± 0.7 millikelvin in one dimension and state-selectively Cooling two nuclear spin isomers. These results demonstrate that the use of proper ro-vibronic transitions enables Laser Cooling of nonlinear molecules, thereby opening a path to efficient Cooling of chiral molecules and, eventually, optical tweezer arrays of complex polyatomic species.
-
direct Laser Cooling of a symmetric top molecule
arXiv: Atomic Physics, 2020Co-Authors: Debayan Mitra, Louis Baum, Benjamin L Augenbraun, Loic Anderegg, Nathaniel B. Vilas, Christian Hallas, Calder Miller, Shivam Raval, John M DoyleAbstract:We report direct Laser Cooling of a symmetric top molecule, reducing the transverse temperature of a beam of calcium monomethoxide (CaOCH$_3$) to $1.8\pm0.7$ mK while addressing two distinct nuclear spin isomers. These results open a path to efficient production of ultracold chiral molecules and conclusively demonstrate that by using proper rovibronic optical transitions, both photon cycling and Laser Cooling of complex molecules can be as efficient as for much simpler linear species.
-
sisyphus Laser Cooling of a polyatomic molecule
Physical Review Letters, 2017Co-Authors: Ivan Kozyryev, Louis Baum, Kyle Matsuda, Benjamin L Augenbraun, Loic Anderegg, Alexander Sedlack, John M DoyleAbstract:: We perform magnetically assisted Sisyphus Laser Cooling of the triatomic free radical strontium monohydroxide (SrOH). This is achieved with principal optical cycling in the rotationally closed P(N^{''}=1) branch of either the X[over ˜]^{2}Σ^{+}(000)↔A[over ˜]^{2}Π_{1/2}(000) or the X[over ˜]^{2}Σ^{+}(000)↔B[over ˜]^{2}Σ^{+}(000) vibronic transitions. Molecules lost into the excited vibrational states during the Cooling process are repumped back through the B[over ˜](000) state for both the (100) level of the Sr-O stretching mode and the (02^{0}0) level of the bending mode. The transverse temperature of a SrOH molecular beam is reduced in one dimension by 2 orders of magnitude to ∼750 μK. This approach opens a path towards creating a variety of ultracold polyatomic molecules by means of direct Laser Cooling.
-
Proposal for Laser Cooling of Complex Polyatomic Molecules.
Chemphyschem : a European journal of chemical physics and physical chemistry, 2016Co-Authors: Ivan Kozyryev, Louis Baum, Kyle Matsuda, John M DoyleAbstract:An experimentally feasible strategy for direct Laser Cooling of polyatomic molecules with six or more atoms is presented. Our approach relies on the attachment of a metal atom to a complex molecule, where it acts as an active photon cycling site. We describe a Laser Cooling scheme for alkaline earth monoalkoxide free radicals taking advantage of the phase space compression of a cryogenic buffer-gas beam. Possible applications are presented including Laser Cooling of chiral molecules and slowing of molecular beams using coherent photon processes.
