Finite-Size Effects in Strongly-Interacting Fermionic Systems

强相互作用费米子系统中的有限尺寸效应

• 批准号: 185817949
• 负责人: Professor Dr. Jens Braun
• 金额: --
• 依托单位: Arbeitsgruppe Strong Interactions and Ultracold Atoms
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/185817949?language=en
• 关键词: Finite; Size; Effects; Strongly; Interacting

Experiments with ultracold fermionic atoms provide a clean and controllable environment to test our understanding of a dynamical formation of condensates and the generation of bound states in strongly interacting systems. These experiments are relevant for a broad collection of phenomena, ranging from superconductivity in metals to the generation of hadronic masses and the state of hadronic matter during the early stages of the evolution of the universe. Providing a consistent theoretical description of the available experimental data is, however, challenging since the phase structure of trapped Fermi gases may strongly depend on the experimental setup, such as the trap geometry and the total particle number. Density Functional Theory combined with functional Renormalization Group techniques offers a great potential for theoretical advances in many-body physics. This project exploits the advantages of both approaches in order to gain a better understanding of confined systems of strongly-interacting fermions and to provide an ab-initio description of condensation and bound-state formation in strongly-interacting theories with an emphasis on the phase structure of trapped strongly-interacting Fermi gases.

超冷费米子原子的实验提供了一个干净和可控的环境，以测试我们的理解的动态形成的凝聚体和产生的束缚态在强相互作用系统。这些实验与一系列广泛的现象有关，从金属的超导性到强子质量的产生和宇宙演化早期阶段强子物质的状态。然而，提供一个一致的理论描述的可用的实验数据是具有挑战性的，因为被困费米气体的相结构可能强烈依赖于实验设置，如陷阱的几何形状和总粒子数。密度泛函理论与泛函重整化群技术的结合为多体物理的理论发展提供了巨大的潜力。该项目利用这两种方法的优点，以获得更好地了解强相互作用费米子的受限系统，并提供一个从头计算描述的凝聚和束缚态形成强相互作用理论，重点是被困强相互作用费米气体的相结构。

项目成果

Fermion interactions and universal behavior in strongly interacting theories

• DOI: 10.1088/0954-3899/39/3/033001
• 发表时间: 2011-08
• 期刊: Journal of Physics G
• 作者: J. Braun

On the phase structure of QCD in a finite volume

• DOI: 10.1016/j.physletb.2012.05.053
• 发表时间: 2011-10
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: J. Braun;B. Klein;B. Schaefer

Fermi gases with imaginary mass imbalance and the sign problem in Monte Carlo calculations

具有虚质量不平衡的费米气体和蒙特卡罗计算中的符号问题

• DOI: 10.1088/0954-3899/41/5/055110
• 发表时间: 2014
• 期刊: Journal of Physics G
• 作者: D. Roscher;J. Braun;J. W. Chen;J. E. Drut
• 通讯作者: J. E. Drut

Phases of spin- and mass-imbalanced ultracold Fermi gases in harmonic traps

谐波陷阱中自旋和质量不平衡的超冷费米气体的相

• DOI: 10.1103/physreva.89.053613
• 发表时间: 2014
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: J. Braun;J. E. Drut;T. Jahn;M. Pospiech;D. Roscher
• 通讯作者: D. Roscher

Imaginary polarization as a way to surmount the sign problem in ab initio calculations of spin-imbalanced Fermi gases.

虚极化作为克服自旋不平衡费米气体从头算中符号问题的一种方法

• DOI: 10.1103/physrevlett.110.130404
• 发表时间: 2013
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: J. Braun;J. W. Chen;J. Deng;J. E. Drut;B. Friman;C. T. Ma;Y. D. Tsai
• 通讯作者: Y. D. Tsai