scholarly journals Transport Properties in Dense QCD Matter

Symmetry ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 366
Author(s):  
Toshitaka Tatsumi ◽  
Hiroaki Abuki
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Quark Matter ◽  
Anomalous Hall Effect ◽  
Close Relation ◽  
Kubo Formula ◽  
Weyl Semimetal ◽  
Chiral Transition ◽  
Spectral Asymmetry ◽  
The Magnetic Field

Transport properties of dense QCD matter are discussed. Using the Kubo formula for conductivity, we discuss some topological aspects of quark matter during the chiral transition. The close relation to Weyl semimetal is pointed out and anomalous Hall effect is demonstrated to be possible. In particular, it is shown that the spectral asymmetry of the quasi-particles plays an important role for the Hall conductivity in the magnetic field.

scholarly journals Effect of confinement potential shape on the electronic, thermodynamic, magnetic and transport properties of a GaAs quantum dot at finite temperature

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
K. Luhluh Jahan ◽  
Bahadir Boyacioglu ◽  
Ashok Chatterjee
Keyword(s):  
Magnetic Field ◽  
Heat Capacity ◽  
Quantum Dot ◽  
Transport Properties ◽  
Average Energy ◽  
Persistent Current ◽  
Confinement Potential ◽  
Potential Shape ◽  
Gaas Quantum Dot ◽  
The Magnetic Field

Abstract The effect of the shape of the confinement potential on the electronic, thermodynamic, magnetic and transport properties of a GaAs quantum dot is studied using the power-exponential potential model with steepness parameter p. The average energy, heat capacity, magnetic susceptibility and persistent current are calculated using the canonical ensemble approach at low temperature. It is shown that for soft confinement, the average energy depends strongly on p while it is almost independent of p for hard confinement. The heat capacity is found to be independent of the shape and depth of the confinement potential at low temperatures and for the magnetic field considered. It is shown that the system undergoes a paramagnetic-diamagnetic transition at a critical value of the magnetic field. It is furthermore shown that for low values of the potential depth, the system is always diamagnetic irrespective of the shape of the potential if the magnetic field exceeds a certain value. For a range of the magnetic field, there exists a window of p values in which a re-entrant behavior into the diamagnetic phase can occur. Finally, it is shown that the persistent current in the present quantum dot is diamagnetic in nature and its magnitude increases with the depth of the dot potential but is independent of p for the parameters considered.

SUPERCONDUCTING FILM WITH AN ARRAY OF MAGNETIC NANOSTRIPES

2013 ◽  
Vol 27 (15) ◽  
pp. 1362020 ◽  
Author(s):  
K. KIM ◽  
K. K. D. RATHNAYAKA ◽  
I. F. LYUKSYUTOV ◽  
D. G. NAUGLE
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Critical Current ◽  
Film Surface ◽  
Critical Currents ◽  
Superconducting Film ◽  
Insulating Layer ◽  
Field Effects ◽  
Matching Field ◽  
The Magnetic Field

We present studies of the transport properties of a Sn superconducting film with an array of parallel nickel magnetic nanostripes (800 nm period) deposited on top of a germanium insulating layer covering the Sn film surface. The critical current parallel to the stripes is larger than the critical current perpendicular to the stripes. Both critical currents demonstrate strong hysteresis and matching field effects. We have observed strong hysteresis in the resistance dependence on the magnetic field.

scholarly journals Magnetic fields in turbulent quark matter and magnetar bursts

2017 ◽  
Vol 27 (01) ◽  
pp. 1750184 ◽  
Author(s):  
Maxim Dvornikov
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Quark Matter ◽  
Electroweak Interaction ◽  
Kinetic Equations ◽  
Small Scale ◽  
Chiral Magnetic Effect ◽  
Dense Quark Matter ◽  
Turbulence Effects ◽  
The Magnetic Field

We analyze the magnetic field evolution in dense quark matter with unbroken chiral symmetry, which can be found inside quark and hybrid stars. The magnetic field evolves owing to the chiral magnetic effect in the presence of the electroweak interaction between quarks. In our study, we also take into account the magnetohydrodynamic turbulence effects in dense quark matter. We derive the kinetic equations for the spectra of the magnetic helicity density and the magnetic energy density as well as for the chiral imbalances. On the basis of the numerical solution of these equations, we find that turbulence effects are important for the behavior of small scale magnetic fields. It is revealed that, under certain initial conditions, these magnetic fields behave similarly to the electromagnetic flashes of some magnetars. We suggest that fluctuations of magnetic fields, described in frames of our model, which are created in the central regions of a magnetized compact star, can initiate magnetar bursts.

Using electrochemical fabrication to grow external arrays of magnetic nanostripes to manipulate superconductivity in the thin film

2015 ◽  
Vol 29 (25n26) ◽  
pp. 1542036
Author(s):  
Wonbae Bang ◽  
W. Teizer ◽  
K. K. D. Rathnayaka ◽  
I. F. Lyuksyutov ◽  
D. G. Naugle
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Transport Properties ◽  
Electrochemical Fabrication ◽  
The Magnetic Field

We present results on electrochemical fabrication of arrays of magnetic nanostripes atop a Sn film covered with an insulating Ge layer. We also report its transport properties and superconducting [Formula: see text]. The transport properties demonstrate strong hysteresis as a function of the magnetic field.

scholarly journals Novel Lifshitz point for chiral transition in the magnetic field

2015 ◽  
Vol 743 ◽  
pp. 66-70 ◽  
Author(s):  
Toshitaka Tatsumi ◽  
Kazuya Nishiyama ◽  
Shintaro Karasawa
Keyword(s):  
Magnetic Field ◽  
Lifshitz Point ◽  
Chiral Transition ◽  
The Magnetic Field

SUPERCONDUCTIVITY ASSOCIATED WITH THE GRANULAR STRUCTURE IN Ba2YCu3O7−δ

1988 ◽  
Vol 02 (08) ◽  
pp. 1011-1015
Author(s):  
YONG ZHAO ◽  
QIRUI ZHANG ◽  
WEIYAN GUAN ◽  
JIANSHENG XIA ◽  
ZHENHUI HE ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Single Phase ◽  
Granular Structure ◽  
Current Voltage ◽  
Granular Superconductivity ◽  
Current Voltage Characteristics ◽  
The Magnetic Field ◽  
Nonmonotonic Behavior

The dependence of the resistance on the magnetic field and the current-voltage characteristics of the single phase Ba 2 YCu 3 O 7−δ have been measured. The nonmonotonic behavior and a hysteresis of R(H) and the current-voltage characteristics suggest that the granular superconductivity exist in this material, and it plays an important role in transport properties.

JOSEPHSON JUNCTION NETWORK AS A TOOL TO SIMULATE INTERGRAIN SUPERCONDUCTING CHANNELS IN YBCO FILMS

2000 ◽  
Vol 14 (25n27) ◽  
pp. 3068-3073 ◽  
Author(s):  
G. ROTOLI ◽  
C. DE LEO ◽  
G. GHIGO ◽  
L. GOZZELINO ◽  
C. CAMERLINGO
Keyword(s):  
Magnetic Field ◽  
Josephson Junction ◽  
Transport Properties ◽  
Granular Structure ◽  
Current Dependence ◽  
Josephson Junction Network ◽  
Experimental Findings ◽  
Static Conditions ◽  
Vortex Phases ◽  
The Magnetic Field

Recent considerations on the physics of YBa 2 Cu 3 O 7-δ films made possible explaining their transport properties as flow of supercurrents through links between the granular structure of the film. The present work deals with the analysis of the Josephson junction network as a discrete set of parallel junctions (1D array) in quasi-static conditions and is aimed to compare the results of the simulations with the experimental findings, in particular with the plateau-like features in the critical current dependence on the magnetic field. Different regimes and vortex phases have been individuated and discussed.

scholarly journals Remarks on the Transport Properties of a Fully Ionized Gas with Application to a Radially Constricted Gas Discharge

1963 ◽  
Vol 16 (2) ◽  
pp. 216 ◽  
Author(s):  
PW Seymour
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Hydrogen Isotope ◽  
High Field ◽  
Gas Discharge ◽  
Ionized Gas ◽  
The Magnetic Field ◽  
Thermal Conductivities ◽  
Vaughan Williams

The correction of Vaughan-Williams and Haas to Marshall's l set of thermal conductivities for a fully ionized hydrogen isotope in the presence of a magnetic field is extended to thel?. and �q (or K) sets, and the high-field limits for the components perpendicular to the magnetic field are included.

scholarly journals HALL EFFECT STUDIES OF THE SUPERCONDUCTING FERROMAGNET UCoGe

2017 ◽  
Vol 35 (2) ◽  
Author(s):  
Danica Krstovska ◽  
Eden Steven ◽  
Andhika Kiswandhi ◽  
James S. Brooks
Keyword(s):  
Magnetic Field ◽  
Hall Effect ◽  
Anomalous Hall Effect ◽  
Simple Relation ◽  
Hall Resistance ◽  
Unusual Behavior ◽  
Perpendicular Component ◽  
Induced Changes ◽  
The Magnetic Field ◽  
Characteristic Field

We find that the Hall effect in a single crystal of UCoGe varies as a function of the angle  between the applied magnetic field and the easy magnetic axis up to fields of 18 T at 0.2 K, i.e. in the region where both superconductivity and ferromagnetic order coexist. Instead of following the conventional cos dependence the two components that com-prise the total Hall resistance, the anomalous and ordinary Hall effect, exhibit quite an unusual behavior with the field direction. The anomalous Hall effect is found to be determined by the parallel component of the magnetization. We sug-gest that the field induced changes in magnetization due to the field rotation play an important role in the observed unu-sual behavior. The ordinary Hall effect cannot be described by the simple relation to the perpendicular component of the magnetic field implying that this component of the Hall effect may be also affected by the variations in magnetization at the characteristic field (kink field). A field induced moment polarization is also observed in Hall effect as in magnetore-sistance, which advances previous findings in UCoGe. The Hall effect slope reverses sign at the kink field indicative of small but possible Fermi surface reconstruction around this field. Our findings show that in UCoGe multiple mecha-nisms contribute to the observed field induced moment polarization at the kink field.

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