Publications (25)
Cooper pairs at above-critical current region
Yongle Yu
It is generally believed that in a superconducor Cooper pairs are broken at above-critical current region, corresponding to the lost of superconductivity. We suggest that, under so…
Simultaneous Multiphoton-Multiatom Processes in Atomic Gases under Laser Fields
Yongle Yu
We investigate simultaneous multiphoton-multiatom processes in atomic gases exposed to laser fields under specific frequency conditions, where multiple atoms are simultaneously exc…
Onset Properties of Supersolid Helium
Yongle Yu
Supersolid helium has a rather low transition temperature and a small critical velocity, compared with liquid helium. These properties could be explained in terms of helium's spect…
On the theory of superfluidity
Yongle Yu
We investigate the properties of dispersion spectra of one-dimensional periodic Bose systems with repulsive interparticle interactions. These systems with sufficient large interact…
The Vortex State in a Strongly Coupled Dilute Atomic Fermionic Superfluid
Aurel Bulgac, Yongle Yu
We show that in a dilute Fermionic superfluid, when the Fermions interact with an infinite scattering length, a vortex state is characterized by a strong density depletion along th…
On supersolid fraction
Yongle Yu
We present an explanation of why the observed supersolid fractions of helium solids are rather far below unity. One might observe large supersolid fraction of neon systems immersin…
Experimental Observation of a Self-Heating Effect of Helium-4 Superflow
Yongle Yu, Hailin Luo
We report a counter-intuitive self-heating effect of helium-4 superflow. This fundamentally unusual heating effect bears a phenomenological resemblance to the Peltier effect of ele…
On the theory of supersolidity
Yongle Yu
We present a microscopic, many-body argument for supersolidity. We also illustrate the origin of rotons in a Bose system.
Local Density Approximation for Pairing Correlations in Nuclei
Aurel Bulgac, Yongle Yu
We introduce a natural and simple to implement renormalization scheme of the Hartree-Fock-Bogoliubov (HFB) equations for the case of zero range pairing interaction. This renormaliz…
Super-Enhanced Absorption of Gravitons in Atomic Gases
Yongle Yu
We present a novel method for detecting gravitons using an atomic gas supported by laser fields. Despite the coupling strength of gravitons to atomic transitions being orders of ma…
Generation and Dynamics of Quantized Vortices in a Unitary Fermi Superfluid
Aurel Bulgac, Yuan-Lung, Luo +3
Superfluidity and superconductivity are remarkable manifestations of quantum coherence at a macroscopic scale. The dynamics of superfluids has dominated the study of these systems…
Superfluid LDA (SLDA): Local Density Approximation for Systems with Superfluid Correlations
Aurel Bulgac, Yongle Yu
We present a concise account of our development of the first genuine Local Density Approximation (LDA) to the Energy Density Functional (EDF) for fermionic systems with superfluid…
Temperature dependence of critical velocities and long time decay of supercurrents
Yongle Yu
We show that a microscopic theory of superfluidity, based on the properties of the many-body spectrum of a superfluid, can explain naturally the temperature dependence of critical…
Heteronuclear Cooper Pairs in An Ultracold Atomic Gas
Yongle Yu
In an ultracold mixture of two different Fermi species of atoms, Cooper pairs can be formed between two different atoms. The masses of one atom and its partner in this kind of Coop…
Microscopic picture of superfluid He
Yongle Yu, Hailin Luo
We elucidate the microscopic quantum mechanism of superfluid He by uncovering a novel characteristic of its many-body energy levels. At temperature below the transition point,…
The Second Law of Thermodynamics and Entropy-Decreasing Processes With He Superflows
Yongle Yu
We review on a recently proposed quantum exception to the second law of thermodynamics. We emphasize that He superflows, like any other forms of flows, shall carry entropy or h…
Signatures of Superfluidity in Dilute Fermi Gases near a Feshbach Resonance
Aurel Bulgac, Yongle Yu
We present a brief account of the most salient properties of vortices in dilute atomic Fermi superfluids near a Feshbach resonance.
Spatial structure of a vortex in low density neutron matter
Yongle Yu, Aurel Bulgac
We study in a fully selfconsistent approach the structure of a vortex in low density superfluid neutron matter. We determine that the matter density profile of a vortex shows a sig…
Fermionic and Bosonic Bubbles and Foam
Aurel Bulgac, Siu A. Chin, Harald A. Forbert +2
The positioning of one or more bubbles inside a many fermion or boson system, does not affect the volume, surface or curvature terms in the liquid drop expansion of the total energ…
Expanding proton dripline by employing a number of muons
Lang Liu, Yongle Yu
Through mean-field calculations, we demonstrate that, in a large nucleus binding multiple muons, these heavy leptons localize within a few dozen femtometers of the nucleus. The…
Energy Density Functional Approach to Superfluid Nuclei
Yongle Yu, Aurel Bulgac
We show that within the framework of a simple local nuclear energy density functional (EDF), one can describe accurately the one-- and two--nucleon separation energies of semi--mag…
Simultaneous Multiphoton-Multiatom Processes in Atomic Gases and Their Application in Enhancing Ultraweak Atomic Absorption Transitions
Yongle Yu
We investigate simultaneous multiphoton-multiatom (MPMA) processes in atomic gases subjected to laser fields. Our study reveals that the composite factor governing the transition r…
Shell correction energy for bubble nuclei
Yongle Yu, Aurel Bulgac, Piotr Magierski
The positioning of a bubble inside a many fermion system does not affect the volume, surface or curvature terms in the liquid drop expansion of the total energy. Besides possible C…
Appendix to: Energy Density Functional Approach to Superfluid Nuclei, nucl-th/0210047
Yongle Yu, Aurel Bulgac
This report is not meant to be submitted for publication at the present time and it is simply a supplement to our work nucl-th/0210047. We have collected together all our results f…
Renormalization of the Hartree-Fock-Bogoliubov Equations in the Case of a Zero Range Pairing Interaction
Aurel Bulgac, Yongle Yu
We introduce a natural and simple to implement renormalization scheme of the Hartree-Fock-Bogoliubov (HFB) equations for the case of zero range pairing interaction. This renormaliz…