Large oscillations in the photoluminescence spectra of a GaAs quantum well in external magnetic fields: A direct measurement of charge transfer in an electron bilayer system

2009 ◽  
Vol 80 (24) ◽  
Author(s):  
V. V. Solovyev ◽  
S. Schmult ◽  
W. Dietsche ◽  
I. V. Kukushkin
Keyword(s):  
Charge Transfer ◽  
Magnetic Fields ◽  
Quantum Well ◽  
Direct Measurement ◽  
Photoluminescence Spectra ◽  
Bilayer System

Quantum well laser operation at low temperature in strong magnetic fields

1983 ◽  
Vol 48 (8) ◽  
pp. 671-673 ◽  
Author(s):  
P. Gavrilovic ◽  
K. Hess ◽  
N. Holonyak ◽  
R.D. Burnham ◽  
T.L. Paoli ◽  
...  
Keyword(s):  
Low Temperature ◽  
Magnetic Fields ◽  
Quantum Well ◽  
Laser Operation ◽  
Strong Magnetic Fields ◽  
Quantum Well Laser

Direct measurement of internal magnetic fields in natural sands using scanning SQUID microscopy

2014 ◽  
Vol 242 ◽  
pp. 10-17 ◽  
Author(s):  
Jan O. Walbrecker ◽  
Beena Kalisky ◽  
Denys Grombacher ◽  
John Kirtley ◽  
Kathryn A. Moler ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Direct Measurement ◽  
Scanning Squid ◽  
Scanning Squid Microscopy

Photoluminescence Characterization of SiGe/Si Quantum-Well Wire Structures

1995 ◽  
Vol 379 ◽  
Author(s):  
S. Nilsson ◽  
H. P. Zeindl ◽  
A. Wolff ◽  
K. Pressel
Keyword(s):  
Quantum Well ◽  
Room Temperature ◽  
Molecular Beam ◽  
Optical Quality ◽  
Photoluminescence Spectra ◽  
Single Quantum Well ◽  
Quantum Well Wire ◽  
Carbon Interstitial

ABSTRACTLow-temperature photoluminescence measurements were performed in order to probe the optical quality of SiGe/Si quantum-well wire structures fabricated by electron-beam lithography and subsequent reactive ion etching, having the patterned polymethylmethacrylate resist as an etch mask. In addition, one set of quantum-well wire structures was post-treated by means of annealing in a hydrogen environment. Our results show that even for the smallest wires of about 100nm in width, the wires exhibit phonon-resolved photoluminescence spectra, similar to that from the molecular beam eptitaxially grown SiGe single quantum well which was used as starting material for the patterning process. After the patterning process a new sharp peak appears in the photoluminescence spectra at 0.97eV in photon energy. Our investigation suggests that this feature is introduced by damage during the patterning process and most probably identical to the G-line, which previously was identified as originating from the dicarbon centre (substitutional carbon-interstitial carbon) in Si. This centre is known to be a very common endproduct of irradiating Si near room temperature which is the case at our patterning process.

scholarly journals Cyclotron lines in highly magnetized neutron stars

2019 ◽  
Vol 622 ◽  
pp. A61 ◽  
Author(s):  
R. Staubert ◽  
J. Trümper ◽  
E. Kendziorra ◽  
D. Klochkov ◽  
K. Postnov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Neutron Stars ◽  
Direct Measurement ◽  
Resonant Scattering ◽  
Electron Cyclotron ◽  
X Ray ◽  
Cyclotron Line ◽  
The Magnetic Field ◽  
Proton Cyclotron

Cyclotron lines, also called cyclotron resonant scattering features are spectral features, generally appearing in absorption, in the X-ray spectra of objects containing highly magnetized neutron stars, allowing the direct measurement of the magnetic field strength in these objects. Cyclotron features are thought to be due to resonant scattering of photons by electrons in the strong magnetic fields. The main content of this contribution focusses on electron cyclotron lines as found in accreting X-ray binary pulsars (XRBP) with magnetic fields on the order of several 1012Gauss. Also, possible proton cyclotron lines from single neutron stars with even stronger magnetic fields are briefly discussed. With regard to electron cyclotron lines, we present an updated list of XRBPs that show evidence of such absorption lines. The first such line was discovered in a 1976 balloon observation of the accreting binary pulsar Hercules X-1, it is considered to be the first direct measurement of the magnetic field of a neutron star. As of today (end 2018), we list 35 XRBPs showing evidence of one ore more electron cyclotron absorption line(s). A few have been measured only once and must be confirmed (several more objects are listed as candidates). In addition to the Tables of objects, we summarize the evidence of variability of the cyclotron line as a function of various parameters (especially pulse phase, luminosity and time), and add a discussion of the different observed phenomena and associated attempts of theoretical modeling. We also discuss our understanding of the underlying physics of accretion onto highly magnetized neutron stars. For proton cyclotron lines, we present tables with seven neutron stars and discuss their nature and the physics in these objects.

Charge transfer between point contacts in high magnetic fields

1995 ◽  
Vol 212 (1) ◽  
pp. 75-82
Author(s):  
V.V. Andrievskii ◽  
Yu.A. Kolesnichenko ◽  
S.V. Rozhok
Keyword(s):  
Charge Transfer ◽  
Magnetic Fields ◽  
High Magnetic Fields ◽  
Point Contacts

Charge transfer at double-layer to single-layer transition in double-quantum-well systems

1995 ◽  
Vol 52 (20) ◽  
pp. 14817-14824 ◽  
Author(s):  
Y. Katayama ◽  
D. C. Tsui ◽  
H. C. Manoharan ◽  
S. Parihar ◽  
M. Shayegan
Keyword(s):  
Charge Transfer ◽  
Quantum Well ◽  
Double Layer ◽  
Single Layer ◽  
Double Quantum ◽  
Layer Transition ◽  
Double Quantum Well
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