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Fundamental Studies of Bose-Einstein Condensates of Polaritons

极化子玻色-爱因斯坦凝聚体的基础研究

基本信息

批准号：
2004570
负责人：
David Snoke
金额：
$ 58.03万
依托单位：
University of Pittsburgh
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-07-15 至 2024-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2004570&HistoricalAwards=false
关键词：
Fundamental Studies Bose Einstein Condensates

项目摘要

Nontechnical Abstract:This project studies fundamental effects of quantum mechanics of optical states in semiconductor structures at low temperature. In particular, this project focuses on the process of Bose-Einstein condensation (BEC), in which many particles enter a single quantum state. The BEC studied here is comprised of “polaritons,” which can be viewed as photons with special properties; for example, they have mass and repel each other, like atoms. BEC has been studied extensively in gases of atoms at low temperature; this project on BEC of polaritons complements the study of BEC of atoms by providing new ways of looking at the system. In particular, the system under study in this project emits coherent light like a laser, which can be studied using advanced optical methods. The principle investigator (PI) of the project will also work closely with the Carnegie Science Center in Pittsburgh to present basic concepts of quantum mechanics to the public. Technical Abstract:This project builds on previous successful work on Bose-Einstein condensation of polaritons by pursuing three main goals: 1) Experiments at the University of Pittsburgh will aim at establishing the phase diagram of BEC under equilibrium conditions, including accurate determination of the condensate fraction as a function of density and temperature; 2) experiments at the University of Pittsburgh will study the onset of BEC from a “quench” (a highly nonequilibrium state) all the way to full equilibrium, in quasi-one-dimensional wires; and 3) experiments at the University of Pittsburgh will study macroscopic coherent states of a condensate in a circular ring, including spin texture and quantized angular momentum states. The above experiments involve ultrafast time-resolved optical spectroscopy, imaging, and interferometry methods available in the Snoke laboratories in Pittsburgh. For each of these thrusts, samples designed at the University of Pittsburgh are grown by molecular beam epitaxy at Princeton University and at the University of Waterloo, then delivered to Pittsburgh for final processing in the clean room at the University of Pittsburgh. This processing includes etching the structures to make one-dimensional wires for controlling the flow of the polariton condensate. The results of these experiments are studied in collaboration with a team of theorists from other universities including the University of Chicago, the University of Strathclyde, the University of Wolverhampton, and the University of Pittsburgh to address fundamental questions, such as the effect of interactions on depletion of the condensate, the theory of damping of a condensate out of equilibrium, and topologically nontrivial states of a condensate.This Division of Materials Research (DMR) grant supports research to understand the phase diagram of BEC under equilibrium and non-equilibrium conditions with funding from the Condensed Matter Physics (CMP) Program in DMR and the Atomic, Molecular and Optical Physics - Experiment (AMO-E) program in the Division of Physics (PHY) both of the Mathematical and Physical Sciences (MPS) Directorate.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术摘要：本计画研究低温下半导体结构中光学态量子力学的基本效应。特别是，该项目侧重于玻色-爱因斯坦凝聚（BEC）过程，其中许多粒子进入单个量子态。这里研究的BEC由“极化激元”组成，极化激元可以被视为具有特殊性质的光子;例如，它们具有质量并相互排斥，就像原子一样。BEC已经在低温下的原子气体中得到了广泛的研究;这个关于极化激元BEC的项目通过提供观察系统的新方法来补充原子BEC的研究。特别是，该项目中正在研究的系统发出像激光一样的相干光，可以使用先进的光学方法进行研究。该项目的主要研究者（PI）还将与匹兹堡卡内基科学中心密切合作，向公众介绍量子力学的基本概念。技术摘要：本项目建立在先前关于玻色-爱因斯坦凝聚的成功工作的基础上，追求三个主要目标：1）匹兹堡大学的实验旨在建立平衡条件下的BEC相图，包括精确确定凝聚分数作为密度和温度的函数; 2）匹兹堡大学的实验将研究BEC从“淬火”开始的过程。（高度非平衡状态）一直到完全平衡，在准一维导线中;匹兹堡大学的实验将研究圆环中凝聚态的宏观相干态，包括自旋织构和量子化角动量态。上述实验涉及匹兹堡Snoke实验室提供的超快时间分辨光谱学，成像和干涉测量方法。对于这些推力中的每一个，匹兹堡大学设计的样品都在普林斯顿大学和滑铁卢大学通过分子束外延生长，然后运送到匹兹堡大学的洁净室进行最终处理。该处理包括蚀刻结构以制造用于控制极化激元冷凝物的流动的一维线。这些实验的结果是与来自其他大学的理论家团队合作研究的，包括芝加哥大学，斯特拉斯克莱德大学，伍尔弗汉普顿大学和匹兹堡大学，以解决基本问题，如相互作用对冷凝物耗尽的影响，冷凝物失去平衡的阻尼理论，材料研究部（DMR）的这一拨款支持研究，以了解平衡和非平衡条件下的BEC相图，资金来自DMR和原子的凝聚态物理（CMP）计划，数学和物理科学（MPS）理事会物理部（PHY）的分子和光学物理-实验（AMO-E）计划。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Ballistic transport of a polariton ring condensate with spin precession

具有自旋进动的极化子环凝聚体的弹道输运

DOI：
10.1103/physrevb.106.245309
发表时间：
2022
期刊：
Physical Review B
影响因子：
3.7
作者：
Yao, Q.;Sedov, E.;Mukherjee, S.;Beaumariage, J.;Ozden, B.;West, K.;Pfeiffer, L.;Kavokin, A.;Snoke, D. W.
通讯作者：
Snoke, D. W.

Topological phase transition in an all-optical exciton-polariton lattice

DOI：
10.1364/optica.426996
发表时间：
2021-02
期刊：
Optica
影响因子：
10.4
作者：
M. Pieczarka;E. Estrecho;Sanjib Ghosh;M. Wurdack;M. Steger;D. Snoke;K. West;L. Pfeiffer;T. Liew;A. Truscott;E. Ostrovskaya
通讯作者：
M. Pieczarka;E. Estrecho;Sanjib Ghosh;M. Wurdack;M. Steger;D. Snoke;K. West;L. Pfeiffer;T. Liew;A. Truscott;E. Ostrovskaya

Reanalysis of experimental determinations of polariton-polariton interactions in microcavities

微腔中极化子-极化子相互作用实验测定的重新分析

DOI：
10.1103/physrevb.107.165302
发表时间：
2023
期刊：
Physical Review B
影响因子：
3.7
作者：
Snoke, D. W.;Hartwell, V.;Beaumariage, J.;Mukherjee, S.;Yoon, Y.;Myers, D. M.;Steger, M.;Sun, Z.;Nelson, K. A.;Pfeiffer, L. N.
通讯作者：
Pfeiffer, L. N.

Low-Energy Collective Oscillations and Bogoliubov Sound in an Exciton-Polariton Condensate

激子-极化子凝聚体中的低能集体振荡和博戈留波夫声

DOI：
10.1103/physrevlett.126.075301
发表时间：
2021
期刊：
Physical Review Letters
影响因子：
8.6
作者：
Estrecho, E.;Pieczarka, M.;Wurdack, M.;Steger, M.;West, K.;Pfeiffer, L. N.;Snoke, D. W.;Truscott, A. G.;Ostrovskaya, E. A.
通讯作者：
Ostrovskaya, E. A.

Bogoliubov excitations of a polariton condensate in dynamical equilibrium with an incoherent reservoir