scholarly journals Ground states of semi-relativistic Pauli-Fierz and no-pair Hamiltonians in QED at critical Coulomb coupling

2103 ◽  
Vol 70 (1) ◽  
pp. 211-237 ◽  
Author(s):  
Martin Koenenberg ◽  
Oliver Matte
Keyword(s):  
Ground States ◽  
Coulomb Coupling

scholarly journals EXISTENCE OF GROUND STATES OF HYDROGEN-LIKE ATOMS IN RELATIVISTIC QED I: THE SEMI-RELATIVISTIC PAULI–FIERZ OPERATOR

2011 ◽  
Vol 23 (04) ◽  
pp. 375-407 ◽  
Author(s):  
MARTIN KÖNENBERG ◽  
OLIVER MATTE ◽  
EDGARDO STOCKMEYER
Keyword(s):  
Electromagnetic Field ◽  
Fine Structure ◽  
Quadratic Form ◽  
Ground States ◽  
Structure Constant ◽  
Coupling Constants ◽  
Fine Structure Constant ◽  
Coupling Constant ◽  
Coulomb Coupling ◽  
Quantized Electromagnetic Field

We consider a hydrogen-like atom in a quantized electromagnetic field which is modeled by means of the semi-relativistic Pauli–Fierz operator and prove that the infimum of the spectrum of the latter operator is an eigenvalue. In particular, we verify that the bottom of its spectrum is strictly less than its ionization threshold. These results hold true, for arbitrary values of the fine-structure constant and the ultraviolet cut-off as long as the Coulomb coupling constant is less than 2/π. For Coulomb coupling constants larger than 2/π, we show that the quadratic form of the Hamiltonian is unbounded below.

Ground states for the ising model with an external field on the Cayley tree

2018 ◽  
Vol 2018 (3) ◽  
pp. 147-155
Author(s):  
M.M. Rakhmatullaev ◽  
M.A. Rasulova
Keyword(s):  
Ising Model ◽  
External Field ◽  
Cayley Tree ◽  
Ground States

scholarly journals Influence of growth flux solvent on anneal-tuning of ground states in CaFe2As2

2018 ◽  
Vol 2 (4) ◽  
Author(s):  
Connor Roncaioli ◽  
Tyler Drye ◽  
Shanta R. Saha ◽  
Johnpierre Paglione
Keyword(s):  
Ground States

Effect of external magnetic field on lane formation in driven pair-ion plasmas

2021 ◽  
Vol 87 (2) ◽  
Author(s):  
Swati Baruah ◽  
U. Sarma ◽  
R. Ganesh
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Coupling Parameter ◽  
Critical Parameters ◽  
Coulomb Coupling ◽  
Lane Formation ◽  
Parameter Values

Lane formation dynamics in externally driven pair-ion plasma (PIP) particles is studied in the presence of external magnetic field using Langevin dynamics (LD) simulation. The phase diagram obtained distinguishing the no-lane and lane states is systematically determined from a study of various Coulomb coupling parameter values. A peculiar lane formation-disintegration parameter space is identified; lane formation area extended to a wide range of Coulomb coupling parameter values is observed before disappearing to a mixed phase. The different phases are identified by calculating the order parameter. This and the critical parameters are calculated directly from LD simulation. The critical electric field strength value above which the lanes are formed distinctly is obtained, and it is observed that in the presence of the external magnetic field, the PIP system requires a higher value of the electric field strength to enter into the lane formation state than that in the absence of the magnetic field. We further find out the critical value of electric field frequency beyond which the system exhibits a transition back to the disordered state and this critical frequency is found as an increasing function of the electric field strength in the presence of an external magnetic field. The movement of the lanes is also observed in a direction perpendicular to that of the applied electric and magnetic field directions, which reveals the existence of the electric field drift in the system under study. We also use an oblique force field as the external driving force, both in the presence and absence of the external magnetic field. The application of this oblique force changes the orientation of the lane structures for different applied oblique angle values.

scholarly journals Synthesis and characterization of [7]triangulene

Nanoscale ◽  
2021 ◽  
Author(s):  
Shantanu Mishra ◽  
Kun Xu ◽  
Kristjan Eimre ◽  
Hartmut Komber ◽  
Ji Ma ◽  
...  
Keyword(s):  
High Spin ◽  
Ground States ◽  
Synthesis And Characterization ◽  
Spintronic Devices

Triangulene and its π-extended homologues constitute non-Kekulé polyradical frameworks with high-spin ground states, and are anticipated to be key components of organic spintronic devices. We report a combined in-solution and...

scholarly journals CaMn3IVO4 Cubane Models of the Oxygen Evolving Complex: Spin Ground States S < 9/2 and the Effect of Oxo Protonation

2021 ◽  
Author(s):  
Heui Beom Lee ◽  
Angela A Shiau ◽  
David Marchiori ◽  
Paul H Oyala ◽  
BYUNG-KUK Yoo ◽  
...  
Keyword(s):  
Ground States ◽  
Oxygen Evolving Complex ◽  
Complex Spin ◽  
Oxygen Evolving
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