Hydrodynamic signatures and spectral properties of the quantum vortex
João E. H. Braz, P. Ribeiro, H. Terças
备注：
(v. 2) Changes in the language and structure of the abstract, introduction and conclusion; minimal change in the title. Typos corrected; slight change in nomenclature (incl. figures) in the main body of the text. References added
We characterize the low-lying excitations of a quantum vortex in a quasi-two-dimensional Bose-Einstein condensate (BEC) using the standard definition of the density of states (DOS) and a modified version that is sensitive to complementary aspects of the excitation's spectrum. The latter proves to be particularly relevant to studying the polaronic state realized when an impurity is embedded in a quantum vortex. We establish that the impurity becomes sensitive to the transversal fluctuations of the vortex, via its remnant kelvon mode, and to the phase fluctuations of the BEC Nambu-Goldstone mode. The presence of the vortex yields an anomalous excitation spectrum with a finite energy gap and non-linear DOS at low energies. We find that the high sensitivity of the kelvon mode to external potentials provides a channel of quantum-level control over impurities trapped in a vortex. This extra control channel may be of practical use for the proposal of using vortex-trapped impurities as qubit units for quantum information processing.
Generalization of the Kutta-Joukowski theorem for the hydrodynamic forces acting on a quantized vortex
Université Libre de Bruxelles（布鲁塞尔自由大学）；Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot, Sorbonne Paris Cité（巴黎天文台，PSL研究大学，法国国家科学研究中心，巴黎第七大学，索邦巴黎西岱大学）
Quantum vortices leave a macroscopic signature in the normal fluid
Istituto per le Applicazioni del Calcolo M. Picone, IAC-CNR（意大利国家研究委员会计算应用研究所）；School of Mathematics, Statistics and Physics, Newcastle University（纽卡斯尔大学数学、统计与物理学院）
Controlled acoustic-driven vortex transport in coupled superfluid rings
Taras Shevchenko National University of Kyiv（基辅塔拉斯舍甫琴科国立大学）；Weizmann Institute of Science（魏茨曼科学研究所）；Georgia Southern University（佐治亚南方大学）；Newcastle University（纽卡斯尔大学）；Lund University（隆德大学）；Universitá di Padova（帕多瓦大学）
Entropy Signatures of Collective Modes and Vortex Dynamics in Rotating Two--Dimensional Bose--Einstein Condensates
Instituto de Física de São Carlos, Universidade de São Paulo（圣卡洛斯物理研究所，圣保罗大学）；School of Mathematics, Statistics and Physics, Newcastle University（纽卡斯尔大学数学、统计与物理学院）；Department of Physics, Asansol Girls’ College（阿桑索尔女子学院物理系）；Instituto de Física, Universidade de São Paulo（圣保罗大学物理研究所）；Departamento de Química, Universidad Autónoma Metropolitana - Iztapalapa（墨西哥自治大学伊兹塔帕拉帕化学系）
