Zeeman splitting and diamagnetic shift of spatially confined quantum-well exciton polaritons in an external magnetic field

2011 ◽  
Vol 84 (16) ◽  
Author(s):  
A. Rahimi-Iman ◽  
C. Schneider ◽  
J. Fischer ◽  
S. Holzinger ◽  
M. Amthor ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Quantum Well ◽  
Zeeman Splitting ◽  
Diamagnetic Shift ◽  
Exciton Polaritons

Charge transport spectra in superconductor-InAs/GaSb-superconductor heterostructures

2021 ◽  
Author(s):  
Kuei Sun ◽  
Zhi-qiang Bao ◽  
Wenlong Yu ◽  
Samuel D Hawkins ◽  
John F Klem ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Quantum Well ◽  
Charge Transport ◽  
Gate Voltage ◽  
Differential Resistance ◽  
Charge Carrier Density ◽  
Quasi Particle ◽  
Current Voltage ◽  
Current Voltage Relation

Abstract Charge transport physics in InAs/GaSb bi-layer systems has recently attracted attention for the experimental search for two-dimensional topological superconducting states in solids. Here we report measurement of charge transport spectra of nano devices consisting of an InAs/GaSb quantum well sandwiched by tantalum superconductors. We explore the current-voltage relation as a function of the charge-carrier density in the quantum well controlled by a gate voltage and an external magnetic field. We observe three types of differential resistance peaks, all of which can be effectively tuned by the external magnetic field, and, however, two of which appear at electric currents independent of the gate voltage, indicating a dominant mechanism from the superconductor and the system geometry. By analyzing the spectroscopic features, we nd that the three types of peaks identify Andreev reflections, quasi-particle interference, and superconducting transitions in the device, respectively. Our results provide a basis for further exploration of possible topological superconducting state in the InAs/GaSb system.

STUDY OF MAGNETIZATION IN MANGANITE SYSTEM IN THE PRESENCE OF LATTICE DISTORTION

2006 ◽  
Vol 20 (15) ◽  
pp. 2093-2116 ◽  
Author(s):  
G. C. ROUT ◽  
N. PARHI ◽  
S. N. BEHERA
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Colossal Magnetoresistance ◽  
Lattice Distortion ◽  
Zeeman Splitting ◽  
Model Parameters ◽  
Coupling Constant ◽  
Magnetic Exchange ◽  
Magnetic Exchange Coupling ◽  
Jahn Teller

The manganites of the type Re1-xAxMnO3( Re = La , Nd , A = Ca , Sr , Ba ) are believed to be half metallic magnets exhibiting colossal magnetoresistance (CMR). The manganite system is described by a simple model Hamiltonian consisting of the hopping of the itinerant d-electrons in the doubly degenerate egband of Mn ions which is split by a static J-T lattice distortion due to band Jahn-Teller (J-T) effect. An external magnetic field results in further Zeeman splitting of the same egband. The ferromagnetism is assumed to originate from the exchange interaction between the spins of the localized core t2gelectrons. The J-T split itinerant (eg) bands are assumed to hybridize rather strongly with the on-site localized (t2g) levels. In the model under consideration the magnetization (m) as well as the lattice strain (e) are expected to depend on the model parameters of the system: i.e. the position of the localized level (d) with respect to the Fermi level, the strength of hybridization (v), the magnetic exchange coupling constant (g1), J-T coupling constant (g), external magnetic field (b) and the impurity concentration (x). The equations for the magnetization and the lattice distortion are solved self-consistently. The effect of different interactions on the quasiparticle bands and the density of states (DOS) are analyzed in detail to understand the evolution of the physical properties of the system on switching the interactions. The temperature dependence of the magnetization due to the localized electrons and that induced in the conduction band are studied.

scholarly journals Magnetic-field interaction of spatially confined quantum-well exciton-polaritons

2013 ◽  
Vol 456 ◽  
pp. 012033 ◽  
Author(s):  
A Rahimi-Iman ◽  
C Schneider ◽  
J Fischer ◽  
S Holzinger ◽  
M Amthor ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Well ◽  
Field Interaction ◽  
Exciton Polaritons
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