Detection of macroscopic quantum coherence of a Bose-Einstein condensate by electronic spin echo

1997 ◽  
Author(s):  
Weiping Zhang ◽  
Guo-Qiang Liu
Keyword(s):  
Quantum Coherence ◽  
Spin Echo ◽  
Einstein Condensate ◽  
Macroscopic Quantum ◽  
Bose Einstein Condensate ◽  
Electronic Spin ◽  
Macroscopic Quantum Coherence ◽  
Bose Einstein

scholarly journals Plasmon Mediation of Charge Pairing in High Temperature Superconductors

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Abel Mukubwa ◽  
John Wanjala Makokha
Keyword(s):  
Quantum Coherence ◽  
Cooper Pair ◽  
High Temperature Superconductors ◽  
Charge Density Waves ◽  
Einstein Condensate ◽  
Plasmon Energy ◽  
Bose Einstein Condensate ◽  
Two Component ◽  
Bose Einstein ◽  
Electromagnetic Radiations

A Bose-Einstein condensate (BEC) of a nonzero momentum Cooper pair constitutes a composite boson or simply a boson. We demonstrated that the quantum coherence of the two-component BEC (boson and fermion condensates) is controlled by plasmons. It has been proposed that plasmons, observed in both electron-doped and hole-doped cuprates, originates from the long-range Coulomb screening, where the transfer momentum q ⟶ 0 . We further show that the screening mediates boson-fermion pairing at condensate state. While only about 1 % of plasmon energy mediates the charge pairing, most of the plasmon energy is used to overcome the modes that compete against superconductivity such as phonons, charge density waves, antiferromagnetism, and damping effects. Additionally, the dependence of frequency of plasmons on the material of a superconductor is also explored. This study gives a quantum explanation of the modes that enhance and those that inhibit superconductivity. The study informs the nature of electromagnetic radiations (EMR) that can enhance the critical temperature of such materials.

scholarly journals TOPOLOGY INDUCED MACROSCOPIC QUANTUM COHERENCE IN JOSEPHSON JUNCTION NETWORKS

2004 ◽  
Vol 18 (04n05) ◽  
pp. 691-704 ◽  
Author(s):  
GIOVANNI GIUSIANO ◽  
FRANCESCO P. MANCINI ◽  
PASQUALE SODANO ◽  
ANDREA TROMBETTONI
Keyword(s):  
Josephson Junction ◽  
Coherent States ◽  
Quantum Coherence ◽  
Einstein Condensation ◽  
Macroscopic Quantum ◽  
Bose Einstein Condensation ◽  
Thermodynamical Properties ◽  
Quantum Properties ◽  
Macroscopic Quantum Coherence ◽  
Bose Einstein

We argue that Josephson junction networks may be engineered to allow for the emergence of new and robust quantum coherent states. We provide a rather intuitive argument showing how the change in topology may affect the quantum properties of a bosonic particle hopping on a network. As a paradigmatic example, we analyze in detail the quantum and thermodynamical properties of non-interacting bosons hopping on a comb graph. We show how to explicitly compute the inhomogeneities in the distribution of bosons along the comb's fingers, evidencing the effects of the topology induced spatial Bose–Einstein condensation characteristic of the system. We propose an experiment enabling to detect the spatial Bose–Einstein condensation for Josephson networks built on comb graphs.

Sign in / Sign up

Export Citation Format

Share Document