In this paper we study the dynamics of Tonks-Girardeau (TG) gases in a harmonic potential driven by Gaussian pulse, which is a correspondence of the excitation dynamics of electrons in matters driven by ultrashort laser pulse. The evolving dynamics of TG gas are obtained with Bose-Fermi mapping method combined with the numerical techniques. We calculate the evolving dynamics of occupation distribution of single-particle energy levels, density distribution and momentum distribution of the system. It is shown that the system arrived at a dynamically stable state at the end of driving. At high-frequency regime TG gases return back to ground state while at low-frequency regime the population inversion exhibits and all atoms occupy high levels.
{"title":"The dynamics of Tonks-Girardeau gas excited by a pulse drive","authors":"Jia Li, Yajiang Hao","doi":"arxiv-2406.17997","DOIUrl":"https://doi.org/arxiv-2406.17997","url":null,"abstract":"In this paper we study the dynamics of Tonks-Girardeau (TG) gases in a\u0000harmonic potential driven by Gaussian pulse, which is a correspondence of the\u0000excitation dynamics of electrons in matters driven by ultrashort laser pulse.\u0000The evolving dynamics of TG gas are obtained with Bose-Fermi mapping method\u0000combined with the numerical techniques. We calculate the evolving dynamics of\u0000occupation distribution of single-particle energy levels, density distribution\u0000and momentum distribution of the system. It is shown that the system arrived at\u0000a dynamically stable state at the end of driving. At high-frequency regime TG\u0000gases return back to ground state while at low-frequency regime the population\u0000inversion exhibits and all atoms occupy high levels.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Trapped bosonic atoms can be cooled down to temperatures where the atomic cloud experiences Bose-Einstein condensation. Almost all atoms in a dilute gaseous system can be Bose-condensed, which implies that this system is in a coherent state. The coherent atomic system enjoys many properties typical of coherent optical systems. It is possible to generate different condensate coherent modes similarly to the generation of optical modes. Several effects can be observed, such as interference patterns, interference current, Rabi oscillations, harmonic generation, parametric conversion, Ramsey fringes, mode locking, dynamic transition between Rabi and Josephson regimes, and atomic squeezing.
{"title":"Atom Optics with Cold Bosons","authors":"V. I. Yukalov, E. P. Yukalova","doi":"arxiv-2406.17868","DOIUrl":"https://doi.org/arxiv-2406.17868","url":null,"abstract":"Trapped bosonic atoms can be cooled down to temperatures where the atomic\u0000cloud experiences Bose-Einstein condensation. Almost all atoms in a dilute\u0000gaseous system can be Bose-condensed, which implies that this system is in a\u0000coherent state. The coherent atomic system enjoys many properties typical of\u0000coherent optical systems. It is possible to generate different condensate\u0000coherent modes similarly to the generation of optical modes. Several effects\u0000can be observed, such as interference patterns, interference current, Rabi\u0000oscillations, harmonic generation, parametric conversion, Ramsey fringes, mode\u0000locking, dynamic transition between Rabi and Josephson regimes, and atomic\u0000squeezing.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shujie Cheng, Shuai-Peng Wang, G. D. M. Neto, Gao Xianlong
This work reports the phase driven symmetry breaking and exact and unconventional superradiance phase transition in the non-Hermitian cascaded Rabi cavities. The non-Hermiticity is introduced in the coupling phase (denoted by $varphi$) between the atom and the optical field. The exactness refers to the fact that the superradiance phase boundary is obtained analytically and verified by the observables. The unconventionality is reflected in that when $|varphi|=frac{pi}{4}$ or $|varphi|=frac{3pi}{4}$, the phase boundary is uniquely determined by $mathcal{J}=frac{1}{2}$ (where $mathcal{J}$ is the dimensionless cavity coupling strength) and is independent of the atom-optical field coupling strength $g$. For other $varphi$, the phase boundary is determined by $mathcal{J}$ and the dimensionless atom-optical field coupling strength $g$ together. Besides, we find that there are phase driven first-order and second-order superradiance phase transitions, and the quantum criticality for the second-order superradiance phase transition is studied. In addition, the experimental feasibility is discussed. This work will stimulate the studies of non-Hermitian superradiance quantum phase transitions and their experimental realizations, as well as the underlying universality class of phase transitions.
{"title":"Phase driven exact and unconventional superradiance phase transition in non-Hermitian cascaded Rabi cavities","authors":"Shujie Cheng, Shuai-Peng Wang, G. D. M. Neto, Gao Xianlong","doi":"arxiv-2406.16576","DOIUrl":"https://doi.org/arxiv-2406.16576","url":null,"abstract":"This work reports the phase driven symmetry breaking and exact and\u0000unconventional superradiance phase transition in the non-Hermitian cascaded\u0000Rabi cavities. The non-Hermiticity is introduced in the coupling phase (denoted\u0000by $varphi$) between the atom and the optical field. The exactness refers to\u0000the fact that the superradiance phase boundary is obtained analytically and\u0000verified by the observables. The unconventionality is reflected in that when\u0000$|varphi|=frac{pi}{4}$ or $|varphi|=frac{3pi}{4}$, the phase boundary is\u0000uniquely determined by $mathcal{J}=frac{1}{2}$ (where $mathcal{J}$ is the\u0000dimensionless cavity coupling strength) and is independent of the atom-optical\u0000field coupling strength $g$. For other $varphi$, the phase boundary is\u0000determined by $mathcal{J}$ and the dimensionless atom-optical field coupling\u0000strength $g$ together. Besides, we find that there are phase driven first-order\u0000and second-order superradiance phase transitions, and the quantum criticality\u0000for the second-order superradiance phase transition is studied. In addition,\u0000the experimental feasibility is discussed. This work will stimulate the studies\u0000of non-Hermitian superradiance quantum phase transitions and their experimental\u0000realizations, as well as the underlying universality class of phase\u0000transitions.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhiqiang Li, Xiaoxiao Hu, Zhao-Yun Zeng, Ai-Xi Chen, Xiaobing Luo
The periodic flashing potential has proven to be a powerful tool for investigating directed atomic currents. By applying the flashing ring-shaped potential to spin-orbit (SO) coupled, noninteracting Bose-Einstein condensate (BEC) systems, through photon-assisted tunneling (resonance) techniques, we demonstrate the generation of tunable alternating (AC) spin and atomic mass currents that can be precisely controlled in terms of direction and strength. The underlying mechanism behind this phenomenon is that the flashing potential supplies enough photons to induce Rabi oscillations and provides momentum transfer for spin and atomic transport. As the single-particle ground state of the unperturbed SO-coupled BEC depends on the Raman coupling strength, we demonstrate how to generate and control AC spin currents in the cases where the initial state resides in a single-well or double-well phase. In particular, we realize and explain the mechanism of generating a net AC spin current without mass current through single-photon resonance processes. It is shown that these interesting resonance phenomena can be analytically described only by the simple three-level model, which creates the possibility of transparent controls of spin dynamics.
事实证明，周期性闪烁势是研究定向原子电流的有力工具。通过光子辅助隧道（共振）技术，我们将闪烁环形电势应用于自旋轨道（SO）耦合的非相互作用玻色-爱因斯坦凝聚态（BEC）系统，证明了可调谐交变（AC）自旋和原子质量流的产生，这种自旋和原子质量流的方向和强度都可以精确控制。这种现象背后的基本机制是闪烁电势提供了足够的光子来诱发拉比振荡，并为自旋和原子传输提供了动量传递。由于未受扰动的 SO 耦合 BEC 的单粒子基态取决于拉曼耦合强度，我们演示了如何在初始态处于单阱或双阱相的情况下产生和控制交流自旋电流。特别是，我们分析并解释了通过单光子共振过程产生无质量电流的净交流自旋电流的机制。研究表明，这些有趣的共振现象只能用简单的三电平模型来分析描述，这为自旋动力学的透明控制提供了可能。
{"title":"Photon-assisted tunneling resonantly controlling spin current of a spin-orbit-coupled atom in a toroidal trap","authors":"Zhiqiang Li, Xiaoxiao Hu, Zhao-Yun Zeng, Ai-Xi Chen, Xiaobing Luo","doi":"arxiv-2406.16002","DOIUrl":"https://doi.org/arxiv-2406.16002","url":null,"abstract":"The periodic flashing potential has proven to be a powerful tool for\u0000investigating directed atomic currents. By applying the flashing ring-shaped\u0000potential to spin-orbit (SO) coupled, noninteracting Bose-Einstein condensate\u0000(BEC) systems, through photon-assisted tunneling (resonance) techniques, we\u0000demonstrate the generation of tunable alternating (AC) spin and atomic mass\u0000currents that can be precisely controlled in terms of direction and strength.\u0000The underlying mechanism behind this phenomenon is that the flashing potential\u0000supplies enough photons to induce Rabi oscillations and provides momentum\u0000transfer for spin and atomic transport. As the single-particle ground state of\u0000the unperturbed SO-coupled BEC depends on the Raman coupling strength, we\u0000demonstrate how to generate and control AC spin currents in the cases where the\u0000initial state resides in a single-well or double-well phase. In particular, we\u0000realize and explain the mechanism of generating a net AC spin current without\u0000mass current through single-photon resonance processes. It is shown that these\u0000interesting resonance phenomena can be analytically described only by the\u0000simple three-level model, which creates the possibility of transparent controls\u0000of spin dynamics.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. S. Grün, S. J. M. White, A. Ortu, A. Di Carli, H. Edri, M. Lepers, M. J. Mark, F. Ferlaino
We present the first successful trapping of single erbium atoms in an array of optical tweezers. Using a single narrow-line optical transition, we achieve deep cooling for direct tweezer loading, pairwise ejection, and continous imaging without additional recoil suppression techniques. Our tweezer wavelength choice enables us to reach the magic trapping condition by tuning the ellipticity of the trapping light. Additionally, we implement an ultrafast high-fidelity fluorescence imaging scheme using a broad transition, allowing time-resolved study of the tweezer population dynamics from many to single atoms during light-assisted collisions. In particular, we extract a pair-ejection rate that qualitatively agrees with the semiclassical predictions by the Gallagher-Pritchard model. This work represents a promising starting point for the exploration of erbium as a powerful resource for quantum simulation in optical tweezers.
{"title":"Optical Tweezer Arrays of Erbium Atoms","authors":"D. S. Grün, S. J. M. White, A. Ortu, A. Di Carli, H. Edri, M. Lepers, M. J. Mark, F. Ferlaino","doi":"arxiv-2406.16146","DOIUrl":"https://doi.org/arxiv-2406.16146","url":null,"abstract":"We present the first successful trapping of single erbium atoms in an array\u0000of optical tweezers. Using a single narrow-line optical transition, we achieve\u0000deep cooling for direct tweezer loading, pairwise ejection, and continous\u0000imaging without additional recoil suppression techniques. Our tweezer\u0000wavelength choice enables us to reach the magic trapping condition by tuning\u0000the ellipticity of the trapping light. Additionally, we implement an ultrafast\u0000high-fidelity fluorescence imaging scheme using a broad transition, allowing\u0000time-resolved study of the tweezer population dynamics from many to single\u0000atoms during light-assisted collisions. In particular, we extract a\u0000pair-ejection rate that qualitatively agrees with the semiclassical predictions\u0000by the Gallagher-Pritchard model. This work represents a promising starting\u0000point for the exploration of erbium as a powerful resource for quantum\u0000simulation in optical tweezers.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"189 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Weiyu Wang, Mingjun Feng, Qianjin Ma, Zi Cai, Erwei Li, Guobin Liu
Pair interaction potentials between atoms in a crystal are in general non-monotonic in distance, with a local minimum whose position gives the lattice constant of the crystal. A temporal analogue of this idea of crystal formation is still pending despite intensive studies on the time crystal phase. In a hybrid spin maser system with a time delay feedback, we report the observation of a continuous time crystal induced by a retarded interaction with a characteristic time scale. This nonequilibrium phase features a self-sustained oscillation with an emergent frequency other than the intrinsic Larmor precession frequency of the spin maser system. It is shown that the amplitude of the oscillation is robust against perturbation, while its time phase randomly distributes from 0 to $2pi$ for different realizations, a signature of spontaneous continuous time translation symmetry breaking. This CTC phase emerges only when the feedback strength exceeds a critical value, at which the system experiences a first order phase transition. Such a retarded interaction induced CTC is closer to the original idea of crystal, compared to mechanisms in other time crystal proposals.
{"title":"Observation of Continuous Time Crystal in a Spin Maser System","authors":"Weiyu Wang, Mingjun Feng, Qianjin Ma, Zi Cai, Erwei Li, Guobin Liu","doi":"arxiv-2406.15017","DOIUrl":"https://doi.org/arxiv-2406.15017","url":null,"abstract":"Pair interaction potentials between atoms in a crystal are in general\u0000non-monotonic in distance, with a local minimum whose position gives the\u0000lattice constant of the crystal. A temporal analogue of this idea of crystal\u0000formation is still pending despite intensive studies on the time crystal phase.\u0000In a hybrid spin maser system with a time delay feedback, we report the\u0000observation of a continuous time crystal induced by a retarded interaction with\u0000a characteristic time scale. This nonequilibrium phase features a\u0000self-sustained oscillation with an emergent frequency other than the intrinsic\u0000Larmor precession frequency of the spin maser system. It is shown that the\u0000amplitude of the oscillation is robust against perturbation, while its time\u0000phase randomly distributes from 0 to $2pi$ for different realizations, a\u0000signature of spontaneous continuous time translation symmetry breaking. This\u0000CTC phase emerges only when the feedback strength exceeds a critical value, at\u0000which the system experiences a first order phase transition. Such a retarded\u0000interaction induced CTC is closer to the original idea of crystal, compared to\u0000mechanisms in other time crystal proposals.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. A. Szwed, B. Vermilyea, D. J. Choksy, Zhiwen Zhou, M. M. Fogler, L. V. Butov, D. K. Efimkin, K. W. Baldwin, L. N. Pfeiffer
Bose polarons are mobile impurities dressed by density fluctuations of a surrounding degenerate Bose gas. These many-body objects have been realized in ultracold atomic gasses and become a subject of intensive studies. In this work, we show that excitons in electron-hole bilayers offer new opportunities for exploring polarons in strongly interacting, highly tunable bosonic systems. We found that Bose polarons are formed by spatially direct excitons immersed in degenerate Bose gases of spatially indirect excitons (IXs). We detected both attractive and repulsive Bose polarons by measuring photoluminescence excitation spectra. We controlled the density of IX Bose gas by optical excitation and observed an enhancement of the energy splitting between attractive and repulsive Bose polarons with increasing IX density, in agreement with our theoretical calculations.
玻色极子是由周围变性玻色气体的密度波动包裹的移动杂质。这些多体物体已在超冷原子气体中实现，并成为深入研究的主题。我们发现，玻色极子是由沉浸在空间间接激子（IXs）的退化玻色气体中的空间直接激子形成的。我们通过测量光致发光激发光谱检测到了吸引性和排斥性玻色极子。我们通过光激发来控制 IX 玻色气体的密度，并观察到随着 IX 密度的增加，吸引性和排斥性玻色极子之间的能量分裂增强，这与我们的理论计算结果一致。
{"title":"Excitonic Bose-polarons in electron-hole bilayers","authors":"E. A. Szwed, B. Vermilyea, D. J. Choksy, Zhiwen Zhou, M. M. Fogler, L. V. Butov, D. K. Efimkin, K. W. Baldwin, L. N. Pfeiffer","doi":"arxiv-2406.15660","DOIUrl":"https://doi.org/arxiv-2406.15660","url":null,"abstract":"Bose polarons are mobile impurities dressed by density fluctuations of a\u0000surrounding degenerate Bose gas. These many-body objects have been realized in\u0000ultracold atomic gasses and become a subject of intensive studies. In this\u0000work, we show that excitons in electron-hole bilayers offer new opportunities\u0000for exploring polarons in strongly interacting, highly tunable bosonic systems.\u0000We found that Bose polarons are formed by spatially direct excitons immersed in\u0000degenerate Bose gases of spatially indirect excitons (IXs). We detected both\u0000attractive and repulsive Bose polarons by measuring photoluminescence\u0000excitation spectra. We controlled the density of IX Bose gas by optical\u0000excitation and observed an enhancement of the energy splitting between\u0000attractive and repulsive Bose polarons with increasing IX density, in agreement\u0000with our theoretical calculations.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhen Zheng, Yan-Qing Zhu, Shanchao Zhang, Shi-Liang Zhu, Z. D. Wang
The essential role of synthetic spin-orbit coupling in discovering new topological matter phases with cold atoms is widely acknowledged. However, the engineering of spin-orbit coupling remains unclear for arbitrary-spin models due to the complexity of spin matrices. In this work, we develop a more general but relatively straightforward method to achieve spin-orbit coupling for multi-spin models. Our approach hinges on controlling the coupling between distinct pseudo-spins through two intermediary states, resulting in tunneling with spin flips that have direction-dependent strength. The engineered spin-orbit coupling can facilitate topological phase transitions with Chern numbers over 1, a unique characteristic of multi-spin models compared to spin-1/2 models. By utilizing existing cold atom techniques, our proposed method provides an ideal platform for investigating topological properties related to large Chern numbers.
{"title":"Synthetic spin-orbit coupling for the multi-spin models in optical lattices","authors":"Zhen Zheng, Yan-Qing Zhu, Shanchao Zhang, Shi-Liang Zhu, Z. D. Wang","doi":"arxiv-2406.14042","DOIUrl":"https://doi.org/arxiv-2406.14042","url":null,"abstract":"The essential role of synthetic spin-orbit coupling in discovering new\u0000topological matter phases with cold atoms is widely acknowledged. However, the\u0000engineering of spin-orbit coupling remains unclear for arbitrary-spin models\u0000due to the complexity of spin matrices. In this work, we develop a more general\u0000but relatively straightforward method to achieve spin-orbit coupling for\u0000multi-spin models. Our approach hinges on controlling the coupling between\u0000distinct pseudo-spins through two intermediary states, resulting in tunneling\u0000with spin flips that have direction-dependent strength. The engineered\u0000spin-orbit coupling can facilitate topological phase transitions with Chern\u0000numbers over 1, a unique characteristic of multi-spin models compared to\u0000spin-1/2 models. By utilizing existing cold atom techniques, our proposed\u0000method provides an ideal platform for investigating topological properties\u0000related to large Chern numbers.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rosario Paredes, Georg Bruun, Arturo Camacho-Guardian
Interactions between quasiparticles mediated by a surrounding environment are ubiquitous and lead to a range of important effects from collective modes of low temperature quantum gases, superconductivity, to the interaction between elementary particles at high energies. This perspective article is motivated by experimental progress in the fields of quantum degenerate atomic gases, cavity QED, and two-dimensional (2D) semi-conductors, which enable a systematic exploration of mediated interactions in new settings and regimes. We first describe how to microscopically calculate the quasiparticle interaction using perturbation theory, diagrammatics, and the path integral, highlighting the key role played by the quantum statistics of the quasiparticles. Recent theoretical and experimental insights into quasiparticle and mediated interactions in general obtained from atomic gases are then discussed, after which we focus on hybrid light-atom systems where a remarkable long range photon mediated interaction can be realised. Next, we describe new and puzzling results regarding the interaction between quasiparticles in 2D semiconductors. We then discuss how mediated interactions open up ways to realise new quantum phases in atomic and hybrid atom-photon systems as well as 2D semiconductors, and the perspective ends by posing some open questions and outlook.
{"title":"Perspective: Interactions mediated by atoms, photons, electrons, and excitons","authors":"Rosario Paredes, Georg Bruun, Arturo Camacho-Guardian","doi":"arxiv-2406.13795","DOIUrl":"https://doi.org/arxiv-2406.13795","url":null,"abstract":"Interactions between quasiparticles mediated by a surrounding environment are\u0000ubiquitous and lead to a range of important effects from collective modes of\u0000low temperature quantum gases, superconductivity, to the interaction between\u0000elementary particles at high energies. This perspective article is motivated by\u0000experimental progress in the fields of quantum degenerate atomic gases, cavity\u0000QED, and two-dimensional (2D) semi-conductors, which enable a systematic\u0000exploration of mediated interactions in new settings and regimes. We first\u0000describe how to microscopically calculate the quasiparticle interaction using\u0000perturbation theory, diagrammatics, and the path integral, highlighting the key\u0000role played by the quantum statistics of the quasiparticles. Recent theoretical\u0000and experimental insights into quasiparticle and mediated interactions in\u0000general obtained from atomic gases are then discussed, after which we focus on\u0000hybrid light-atom systems where a remarkable long range photon mediated\u0000interaction can be realised. Next, we describe new and puzzling results\u0000regarding the interaction between quasiparticles in 2D semiconductors. We then\u0000discuss how mediated interactions open up ways to realise new quantum phases in\u0000atomic and hybrid atom-photon systems as well as 2D semiconductors, and the\u0000perspective ends by posing some open questions and outlook.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hassan Alnatah, Qi Yao, Qiaochu Wan, Jonathan Beaumariage, Ken West, Kirk Baldwin, Loren N. Pfeiffer, David W. Snoke
We report the canonical properties of Bose-Einstein condensation of polaritons, seen previously in many low-temperature experiments, at room temperature in a GaAs/AlGaAs structure. These effects include a nonlinear energy shift of the polaritons, showing that they are not non-interacting photons, and dramatic line narrowing due to coherence, giving coherent emission with spectral width of 0.24 meV at room temperature with no external stabilization. This opens up the possibility of room temperature nonlinear optical devices based on polariton condensation.
{"title":"Bose-Einstein condensation of polaritons at room temperature in a GaAs/AlGaAs structure","authors":"Hassan Alnatah, Qi Yao, Qiaochu Wan, Jonathan Beaumariage, Ken West, Kirk Baldwin, Loren N. Pfeiffer, David W. Snoke","doi":"arxiv-2406.13689","DOIUrl":"https://doi.org/arxiv-2406.13689","url":null,"abstract":"We report the canonical properties of Bose-Einstein condensation of\u0000polaritons, seen previously in many low-temperature experiments, at room\u0000temperature in a GaAs/AlGaAs structure. These effects include a nonlinear\u0000energy shift of the polaritons, showing that they are not non-interacting\u0000photons, and dramatic line narrowing due to coherence, giving coherent emission\u0000with spectral width of 0.24 meV at room temperature with no external\u0000stabilization. This opens up the possibility of room temperature nonlinear\u0000optical devices based on polariton condensation.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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