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Wyświetlanie 1-15 z 32
Tytuł:
Monte Carlo Treatment of Non-Equilibrium Processes in n-Type InSb Crystals
Autorzy:
Ašmontas, S.
Raguotis, R.
Powiązania:
https://bibliotekanauki.pl/articles/1813219.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.65.Pp
72.10.-d
72.10.Fk
72.20.Dp
Opis:
Numerical calculation by Monte Carlo method of the dynamic behaviour of electron ensemble in n-type InSb crystals after step-like application of electric field is presented. The results show essential influence of electron density on the energy relaxation time. The effect of electron energy cooling below equilibrium temperature in compensated n-InSb is obtained numerically for the first time, which is in agreement with experimental results.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 929-932
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopy of a Single Si Donor by the Resonant Tunnelling Experiment
Autorzy:
Baj, M.
Gryglas, M.
Jouault, B.
Maude, D.
Faini, G.
Gennser, U.
Cavanna, A.
Powiązania:
https://bibliotekanauki.pl/articles/2046906.pdf
Data publikacji:
2006-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.-b
73.40.Gk
73.20.Hb
72.10.Di
72.10.Fk
Opis:
Resonant tunnelling via single impurities placed in a single barrier was experimentally studied. The typically observed structures in the current-voltage characteristics seem to be paired. Such a pair can be interpreted as ground and excited states of an impurity, related to X$\text{}_{xy}$ and X$\text{}_{z}$ valleys, which is in agreement with the results obtained for big mesas. However, it is not clear why X$\text{}_{xy}$ states can be seen without any phonon participation.
Źródło:
Acta Physica Polonica A; 2006, 110, 2; 157-162
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bulk and Epitaxial $Co_2MnSi$ Systems with Antisite Disorder: Ab Initio Calculations
Autorzy:
Carva, K.
Turek, I.
Powiązania:
https://bibliotekanauki.pl/articles/1813602.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.25.-b
72.10.Fk
Opis:
The intermetallic compound $Co_2MnSi$ is halfmetallic, but the structure of real samples is often affected by antisite disorder. The influence of disorder on transport properties is examined by ab initio calculations and is found to be more significant in thin $Co_2MnSi$ slabs sandwiched by metallic leads than in the bulk compound.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 183-186
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carrier Heating Efficiency in Optically Detected Cyclotron Resonance Experiment
Autorzy:
Dedulewicz, S.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929627.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Gq
72.10.Di
72.10.Fk
Opis:
Monte Carlo calculations of carrier heating efficiency in optically detected cyclotron resonance experiment are presented. It is shown that electrons accelerated by microwave electric field gain energy sufficient for impact ionization of shallow centers and for exciton dissociation. It is also explained why very sharp thresholds for impact processes were observed in the optically detected cyclotron resonance investigations.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 535-537
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
HgSe Based Mixed Crystals Doped with Fe Resonant Donors
Autorzy:
Dobrowolski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1943963.pdf
Data publikacji:
1996-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Fr
72.10.Fk
71.55.Gs
Opis:
The article reviews the physical properties of semimagnetic semiconductors of the type Hg$\text{}_{1-x-y}$Fe$\text{}_{x}$A$\text{}_{y}^{II}$Se$\text{}_{1-z}$B$\text{}_{z}^{VI}$ and Hg$\text{}_{1-x-y}$Fe$\text{}_{x}$Mn$\text{}_{y}$Se. Optical, magnetooptical, transport and magnetotransport experiments showed that in Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se substitutional iron forms a resonant donor state whose energy is superimposed on the conduction band continuum. Resulting anomalous properties of electron scattering rate, i.e. strong enhancement of electron mobility (or drop of Dingle temperature), which occur in Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se at low temperatures in a certain Fe concentration range, are described. Next, theoretical models describing this anomalous reduction of the scattering rate are discussed. The description of thermomagnetic, optical, magnetooptical and magnetic properties of Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se, with emphasis on features originating from the peculiar iron level position in the band structure of Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se, conclude the first part of the present paper. In the second part the physical properties of the semiconducting alloys Hg$\text{}_{1-x}$Mn$\text{}_{x}$Se:Fe, Hg$\text{}_{1-v}$Cd$\text{}_{v}$Se:Fe, Hg$\text{}_{1-x}$Zn$\text{}_{x}$Se:Fe, HgSe$\text{}_{1-x}$Te$\text{}_{x}$:Fe and HgSe$\text{}_{1-x}$S$\text{}_{x}$:Fe are described. In particular, the dependence of the position of the Fe resonant donor state in the band structure on the crystal composition is discussed. The values of predicted Γ$\text{}_{6}$ and Γ$\text{}_{8}$ band offsets between HgSe and CdSe, HgTe, MnSe and ZnSe are given. The considerable attention is paid to the discussion of the mechanism limiting the electron mobility in the mixed alloys. Finally, topics which have not been explicitly covered in this review are mentioned and open problems are discussed.
Źródło:
Acta Physica Polonica A; 1996, 89, 1; 3-36
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Inelastic Mean Free Path of Electrons in Noble Metals
Autorzy:
Doliński, W.
Mróz, S.
Palczyński, J.
Gruzza, B.
Bondot, P.
Porte, A.
Powiązania:
https://bibliotekanauki.pl/articles/1892437.pdf
Data publikacji:
1992-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
79.20.Fv
Opis:
The experimental values of Inelastic Mean Free Path (λ$\text{}_{IMFP}$) of electrons in noble metals (Ag, Au, Cu) are determined in the electron energy range 150-2000 eV. The method used consists of the measurements and theoretical calculations of the coefficient of elastic backscattering of electrons from a solid surface η$\text{}_{e}$. The obtained values of λ$\text{}_{IMFP}$ are compared with the data available in the literature.
Źródło:
Acta Physica Polonica A; 1992, 81, 2; 193-199
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The H$\text{}_{2}$ Molecule in Semiconductors: An Angel in GaAs, a Devil in Si
Autorzy:
Estreicher, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/2035568.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.-y
66.30.Lw
72.10.Fk
Opis:
The electrical and optical properties of semiconductors are largely determined by the defects and impurities they contain. Without a doubt, hydrogen is the impurity which exhibits the most varied and exotic properties. In most semiconductors, it is found in three charge states and four configurations. It forms (at least) two types of dimers as well as small and large precipitates such as platelets. H also interacts with impurities and defects. It removes or changes the electrical activity of many shallow and deep centers, and catalyzes the diffusion of interstitial oxygen (in Si). Sometimes, it exhibits quantum tunneling and is associated with unusual effects such as Fermi resonances. But one of the most exotic forms of hydrogen in GaAs and Si is the interstitial H$\text{}_{2}$ molecule, which appears to play a critical role in processes such as the "smart cut". It is the only interstitial molecule observed (so far) in semiconductors. In GaAs, it behaves like a nearly-free rotator, with properties very much as one would expect them to be. But in Si, the early experiments were puzzling. No ortho/para splitting was observed, the symmetry appeared to be C$\text{}_{1}$, the single HD line was at the wrong place and had the wrong amplitude, and other features seemed strange as well. Recent experimental studies have now resolved many issues. However, the behavior of the simplest molecule in the Universe proved to be a tough nut to crack, which goes to show that devils can be a lot more fun than angels after all.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 513-528
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermoelectric Power and Thermal Conductivity of Heavy Fermion $CeCu_4Al$
Autorzy:
Falkowski, M.
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1426875.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
72.15.Eb
72.15.Jf
72.15.Qm
Opis:
The thermal conductivity and thermopower are discussed for the heavy fermion $CeCu_4Al$ compound. $CeCu_4Al$ is paramagnetic and follows the modified Curie-Weiss law with $μ_{eff}$ = 2.53 $μ_{B}$/f.u. and $\Theta_{P}$ = - 10 K indicating on the presence of well localized magnetic moments of $Ce^{3+}$ ions. The determined electronic specific heat coefficient γ = 2.2 J $mol^{-1}K^{-2}$ confirms the heavy fermion character of this compound. Thermopower is positive over the whole temperature range and below $T_{max}$ = 25 K falls rapidly. Based on a simple band model the position and width of the 4f peak nearest to the Fermi level have been estimated. The measured total thermal conductivity of the $CeCu_4Al$ compound increases almost linearly with increasing temperature.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1056-1058
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aharonov-Bohm Effect at Misfit Dislocations in GaAsSb/GaAs Heterostructures
Autorzy:
Figielski, T.
Wosiński, T.
Mąkosa, A.
Dobrowolski, W.
Raczyńska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1950746.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
73.40.Kp
03.65.Bz
Opis:
We examined the current flowing through p$\text{}^{+}$-n junction of the lattice mismatched GaAs$\text{}_{1-x}$Sb$\text{}_{x}$/GaAs heterostructure in a transverse magnetic field at 1.8 K. We have found the appearance of current oscillations, periodic as a function of the magnetic field, that are due to the Aharonov-Bohm effect of holes passed around charged dislocations.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 773-776
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peculiarities of Electron Transport in PbTe:Cr due to Presence of Resonant Impurity State
Autorzy:
Grodzicka, E.
Dobrowolski, W.
Kossut, J.
Story, T.
Witkowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1929686.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Fr
72.10.Fk
72.80.Jc
Opis:
The results of transport investigation of Pb$\text{}_{1-x}$Cr$\text{}_{x}$Te (x ≤ 0.009) in temperature range 3.5-300 K are presented. The obtained electron concentration and electron mobility vs. temperature and Cr concentration data are interpreted and discussed within the model assuming that Cr in PbTe forms a donor state resonant with the conduction band.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 599-603
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Graphene Conductance in the Presence of Resonant Impurities
Autorzy:
Inglot, M.
Dugaev, V.
Powiązania:
https://bibliotekanauki.pl/articles/1402560.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
72.80.Vp
73.20.Hb
Opis:
We discuss transport properties of graphene related to the resonant scattering from impurities and defects. Two different models describing defects in the bulk of graphene or at the graphene surface are used for the calculation of self energy of electrons scattered from short-range impurities or defects. The results of numerical calculations demonstrate a resonant character of resistance. In the case of neutral impurities or defects the scattering also leads to a resonant decrease of the spin relaxation time.
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 163-165
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ESR Spectroscopy of Graphene with Adsorbed NaCl Particles
Autorzy:
Karpierz, E.
Drabińska, A.
Bożek, R.
Kaźmierczak, P.
Wysmołek, A
Kamińska, M
Strupiński, W.
Powiązania:
https://bibliotekanauki.pl/articles/1376214.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.ue
72.10.Fk
78.67.Wj
72.80.Vp
Opis:
Due to its peculiar properties graphene is a good candidate for sensor materials. Therefore, it is important to study influence of different fluids on graphene layer. The presented studies showed pinning of NaCl microcrystals to graphene surface after immersing graphene in NaCl solution and subsequent careful rinsing with distilled water. The atomic force microscopy images revealed presence of many NaCl-related structures over 100 nm high on graphene surface. The electron spin resonance spectrum for magnetic field perpendicular to the graphene layer consisted of several lines originating from NaCl. The pinning of NaCl microcrystals resulted in increase of electron scattering, as confirmed by the Raman spectroscopy (the increase of intensity of D and D' bands) and weak localization measurement (the decrease of coherence length).
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1187-1189
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Electrical Studies of Graphene Deposited on GaN Nanowires
Autorzy:
Kierdaszuk, J.
Kaźmierczak, P.
Drabińska, A.
Wysmołek, A.
Korona, K.
Kamińska, M.
Pakuła, K.
Pasternak, I.
Krajewska, A.
Żytkiewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1195433.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.ue
72.10.Fk
78.67.Wj
72.80.Vp
Opis:
In this paper using scanning electron microscope, contactless microwave electronic transport and the Raman spectroscopy we studied the properties of graphene deposited on GaN nanowires and compared it with the graphene deposited on GaN epilayer. The Raman micro-mapping showed that nanowires locally change the strain and the concentration of carriers in graphene. Additionally we observed that nanowires increase the intensity of the Raman spectra by more than one order of magnitude.
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1087-1089
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kondo-Fano Effect in Double Quantum Dot Side Attached to a Pair of Wires
Autorzy:
Krychowski, D.
Lipiński, S.
Powiązania:
https://bibliotekanauki.pl/articles/1386758.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
73.21.-b
73.22.-f
73.23.-b
Opis:
Electron tunneling through a double quantum dot side coupled to a pair of leads is examined in finite-U slave boson mean field approach. Both the two-impurity Kondo regime at half filling and one-and three-electron Kondo effects are analyzed. Special attention is paid to the case when one of the dots is coupled to ferromagnetic lead and another to nonmagnetic. Depending on the gate voltage, the same or opposite sign of polarizations of conductance of the leads is observed.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 487-489
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin Dependent Conductance of a Quantum Dot Side attached to Topological Superconductors as a Probe of Majorana Fermion States
Autorzy:
Krychowski, D.
Lipiński, S.
Cuniberti, G.
Powiązania:
https://bibliotekanauki.pl/articles/1030460.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
73.63.Kv
74.45.+c
85.35.Gv
Opis:
Spin-polarized transport through a quantum dot side attached to a topological superconductor and coupled to a pair of normal leads is discussed in Coulomb and Kondo regimes. For discussion of Coulomb range equation of motion method with extended Hubbard I approximation is used and Kondo regime is analyzed by Kotliar-Ruckenstein slave boson approach. Apart from the occurrence of zero bias anomaly the presence of Majorana states reflects also in splitting of Coulomb lines. In the region of Coulomb borders the spin dependent negative differential conductance is observed. Due to the low energy scale of Kondo effect this probe allows for detection of Majorana states even for extremely weak coupling with topological wire. In this range no signatures of Majorana states appear in Coulomb blockade dominated transport.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 552-554
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 32

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