English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Breaking of Goldstone modes in a two-component Bose-Einstein condensate

Recati, A., & Piazza, F. (2019). Breaking of Goldstone modes in a two-component Bose-Einstein condensate. Physical Review B, 99(6): 064505. doi:10.1103/PhysRevB.99.064505.

Item is

Files

show Files
hide Files
:
1609.01954 (Preprint), 19KB
Name:
1609.01954
Description:
-
OA-Status:
Visibility:
Public
MIME-Type / Checksum:
application/xhtml+xml / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-

Locators

show

Creators

show
hide
 Creators:
Recati, Alessio1, Author
Piazza, Francesco2, Author           
Affiliations:
1external, ou_persistent22              
2Max Planck Institute for the Physics of Complex Systems, Max Planck Society, ou_2117288              

Content

show
hide
Free keywords: -
 MPIPKS: Phase transitions and critical phenomena
 Abstract: We study the decay rate Gamma(k) of density excitations of two-component Bose-Einstein condensates at zero temperature. Those excitations, where the two components oscillate in phase, include the Goldstone mode resulting from condensation. While within Bogoliubov approximation the density sector and the spin (out-ofphase) sector are independent, they couple at the three-phonon level. For a Bose-Bose mixture we find that the Belyaev decay is slightly modified due to the coupling with the gapless spin mode. At the phase separation point the decay rate changes instead from the standard k(5) to a k(5/2) behavior due to the parabolic nature of the spin mode. If instead a coherent coupling between the two components is present, the spin sector is gapped and, away from the ferromagnetic-like phase transition point, the decay of the density mode is not affected. On the other hand, at the transition point, when the spin fluctuations become critical, the Goldstone mode is not well defined anymore since Gamma(k) proportional to k. As a consequence, we show that the friction induced by a moving impurity is enhanced-a feature which could be experimentally tested. Our results apply to every nonlinear 2-component quantum hydrodynamic Hamiltonian which is time-reversal invariant and possesses an U(1) x Z(2) symmetry.

Details

show
hide
Language(s):
 Dates: 2019-02-122019-02-01
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 99 (6) Sequence Number: 064505 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008