Coexistence of phase transitions and hysteresis near the onset of Bose-Einstein condensation

Männel, M.; Morawetz, Klaus; Lipavský, Pavel

doi:10.1103/physreva.87.053617

Cited by 5 publications

(4 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well known that mean-field approaches, such as the Popov theory and the HF theory, usually lead to a BEC transition of first order. The normal-superfluid PS was also predicted for spinless bosons with purely repulsive interactions [34][35][36], in which case the false spinodal decomposition near the BEC transition is due to the unphysical multi-valued behavior of the mean-field EoS. Such artifact differs from the results presented here, where the mechanical instability is caused by the interspin attraction.…”

contrasting

confidence: 41%

Normal-Superfluid Phase Separation in Spin-Half Bosons at Finite Temperature

Lin

Gao

2020

Phys. Rev. Lett.

View full text Add to dashboard Cite

For pseudospin-half bosons with inter-spin attraction and intra-spin repulsion, normal phase and Bose condensed phase can coexist at finite temperature. The homogeneous system is unstable against the spinodal decomposition within a medium density interval, and consequently, a normal-superfluid phase separation takes place. The isothermal equation-of-state shows a characteristic plateau in the P -V (pressure-volume) diagram, which is reminiscent of a classical gas-liquid transition, although, unlike the latter, the coexistence lines never terminate at a critical point as temperature increases. In a harmonic trap, the phase separation can be revealed by the density profile of the atomic cloud, which exhibits a sudden jump across the phase boundary.

show abstract

contrasting

confidence: 41%

Normal-Superfluid Phase Separation in Spin-Half Bosons at Finite Temperature

Lin

Gao

2020

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…It is a consequence of the hierarchical dependencies of correlations [80]. This scheme of multiple-scattering corrected T -matrix has been successfully applied to describe the critical behaviour in and outside a condensate in superconductivity [81] and in Bose-Einstein condensation [82,83].…”

Section: Multiple-scattering Corrected T -Matrix Approachmentioning

confidence: 99%

Bose condensation of squeezed light

Morawetz

2019

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

Light with a chemical potential and no mass is shown to possess a general phase-transition curve to Bose-Einstein condensation. This limiting density and temperature range is found by the diverging in-medium potential range of effective interaction. The inverse expansion series of the effective interaction from Bethe-Salpeter equation is employed exceeding the ladder approximation. While usually the absorption and emission with Dye molecules is considered, here it is proposed that squeezing can create also such a mean interaction leading to a chemical potential. The equivalence of squeezed light with a complex Bogoliubov transformation of interacting Bose system with finite lifetime is established with the help of which an effective gap is deduced where the squeezing parameter is related to an equivalent gap by |∆(ω)| = ω/(coth 2|z(ω)| − 1). This gap phase creates a finite condensate in agreement with the general limiting density and temperature range. In this sense it is shown that squeezing induces the same effect on light as an interaction leading to possible condensation. The phase diagram for condensation is presented due to squeezing and the appearance of two gaps is discussed.

show abstract

“…Recently it has been shown that one can arrive at the same equations by a completely conserving theory of multiple corrected T‐matrix [ 56–58 ] with equivalent results. [ 59,60 ] This illustrates that the anomalous propagators are a theoretical shortcut to the right result through adopting inconsistent propagators.…”

Section: Introductionmentioning

confidence: 99%

Exploring Anomalies by Many‐Body Correlations

Morawetz

2021

Physica Status Solidi (b)

View full text Add to dashboard Cite

The quantum anomaly is written alternatively into a form violating conservation laws or as non‐gauge invariant currents seen explicitly on the example of chiral anomaly. By reinterpreting the many‐body averaging, the connection to Pauli–Villars regularization is established which gives the anomalous term a new interpretation as arising from quantum fluctuations by many‐body correlations at short distances. This is exemplified using an effective many‐body quantum potential which realizes quantum Slater sums by classical calculations. It is shown that these quantum potentials avoid the quantum anomaly but approach the same anomalous result by many‐body correlations. Consequently, quantum anomalies might be a shortcut way of single‐particle field theory to account for many‐body effects. This conjecture is also supported since the chiral anomaly can be derived by a completely conserving quantum kinetic theory. A measure for the quality of quantum potentials is suggested to describe these quantum fluctuations in the mean energy. The derived quantum potentials might be used to describe quantum simulations in classical terms.

show abstract

Coexistence of phase transitions and hysteresis near the onset of Bose-Einstein condensation

Cited by 5 publications

References 45 publications

Normal-Superfluid Phase Separation in Spin-Half Bosons at Finite Temperature

Normal-Superfluid Phase Separation in Spin-Half Bosons at Finite Temperature

Bose condensation of squeezed light

Exploring Anomalies by Many‐Body Correlations

Contact Info

Product

Resources

About