369 research outputs found
Origin of the inner ring in photoluminescence patterns of quantum well excitons
In order to explain and model the inner ring in photoluminescence (PL)
patterns of indirect excitons in GaAs/AlGaAs quantum wells (QWs), we develop a
microscopic approach formulated in terms of coupled nonlinear equations for the
diffusion, thermalization and optical decay of the particles. The origin of the
inner ring is unambiguously identified: it is due to cooling of indirect
excitons in their propagation from the excitation spot. We infer that in our
high-quality structures the in-plane diffusion coefficient is about 10-30cm^2/s
and the amplitude of the disorder potential is about 0.45meV.Comment: 4 pages, 3 figure
The Interaction in the Macroscopically Ordered Exciton State
The macroscopically ordered exciton state (MOES) - a periodic array of beads
with spatial order on a macroscopic length - appears in the external exciton
rings at low temperatures below a few Kelvin. Here, we report on the
experimental study of the interaction in the MOES. The exciton PL energy varies
in concert with the intensity along the circumference of the ring, with the
largest energy found in the brightest regions. This shows that the MOES is
characterized by the repulsive interaction and is not driven by the attractive
interaction.Comment: 3 pages, 3 figure
Theory of condensation of indirect excitons in a trap
We present theoretical studies of condensation of indirect excitons in a
trap. Our model quantifies the effect of screening of the trap potential by
indirect excitons on exciton condensation. The theoretical studies are applied
to a system of indirect excitons in a GaAs/AlGaAs coupled quantum well
structure in a diamond-shaped electrostatic trap where exciton condensation was
studied in earlier experiments. The estimated condensation temperature of the
indirect excitons in the trap reaches hundreds of milliKelvin
Kinetics of the inner ring in the exciton emission pattern in GaAs coupled quantum wells
We report on the kinetics of the inner ring in the exciton emission pattern.
The formation time of the inner ring following the onset of the laser
excitation is found to be about 30 ns. The inner ring was also found to
disappear within 4 ns after the laser termination. The latter process is
accompanied by a jump in the photoluminescence (PL) intensity. The spatial
dependence of the PL-jump indicates that the excitons outside of the region of
laser excitation, including the inner ring region, are efficiently cooled to
the lattice temperature even during the laser excitation. The ring formation
and disappearance are explained in terms of exciton transport and cooling.Comment: 19 pages, 6 figure
Π‘ΡΡΠ°ΡΠ΅Π³ΠΈΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ Π°Π²ΡΠΎΠΌΠΎΠ±ΠΈΠ»Π΅ΡΡΡΠΎΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΈ Π½Π° ΡΠΎΡΡΠΈΠΉΡΠΊΠΎΠΌ Π°Π²ΡΠΎΡΡΠ½ΠΊΠ΅ Π½Π° ΠΏΡΠΈΠΌΠ΅ΡΠ΅ ΠΠΠ Β«Π‘ΠΎΠ»Π»Π΅ΡΡΒ»
The article analyses the dynamics of development of the Russian market of passenger cars and light commercial vehicles, investigates the strategy and competitive advantages of Sollers group of companies, which is successfully operating despite volatility of development of the Russian car market, as well as the need for a radical renewal of the model range of the companyβs cars, the presence of excess production capacity and the departure from Russia of three foreign partners of Sollers group of companies in joint ventures: Fiat, SsangYong and Ford. Particular attention in the article is paid to Ford, a joint venture partner with Sollers PJSC, which left the Russian domestic market in 2019. This event, which had a negative impact on partners and clients of the company, was caused by severalcircumstances. Besides, the article identifies the main directions of development of joint ventures Mazda Sollers and Ford Sollers (in terms of Ford Transit minibus, the only locally manufactured Ford model) and the possibility of expanding their export potential, including due to export of engines, spare parts and components.The article pays close attention to introduction of new technologies in Sollers PJSC and other companies, development of digitalisation in development and production of new models, creation of its own telematics platform that allows to connect a car to the Internet and control it remotely, including starting the engine.The author examines in detail a new consumption model in the car market associated with refusal of buyers to own a car and with emerging choice of new services regarding subscription and exchange of cars, their development in foreign and domestic markets, as well as offers the analysis of successes and failures of foreign automakers in providing subscription services.The main purpose of the article is to study the strategy of Sollers PJSC in the domestic and foreign markets, auxiliary purposes refer to the analysis of the domestic market, change in the consumption model and provision of new services, study of reasons for departure of foreign partners of the company.Π ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Π½ΠΎΠΉ ΡΡΠ°ΡΡΠ΅ ΠΏΡΠΎΠ²Π΅Π΄ΡΠ½ Π°Π½Π°Π»ΠΈΠ· Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠΈ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΡΠΎΡΡΠΈΠΉΡΠΊΠΎΠ³ΠΎ ΡΡΠ½ΠΊΠ° Π»Π΅Π³ΠΊΠΎΠ²ΡΡ
ΠΈ Π»ΡΠ³ΠΊΠΈΡ
ΠΊΠΎΠΌΠΌΠ΅ΡΡΠ΅ΡΠΊΠΈΡ
Π°Π²ΡΠΎΠΌΠΎΠ±ΠΈΠ»Π΅ΠΉ, ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ ΡΡΡΠ°ΡΠ΅Π³ΠΈΡ ΠΈ ΠΊΠΎΠ½ΠΊΡΡΠ΅Π½ΡΠ½ΡΠ΅ ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²Π° Π³ΡΡΠΏΠΏΡ ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΉ Β«Π‘ΠΎΠ»Π»Π΅ΡΡΒ», ΠΊΠΎΡΠΎΡΠ°Ρ ΡΡΠΏΠ΅ΡΠ½ΠΎ ΡΡΠ½ΠΊΡΠΈΠΎΠ½ΠΈΡΡΠ΅Ρ, Π½Π΅ΡΠΌΠΎΡΡΡ Π½Π° Π²ΠΎΠ»Π°ΡΠΈΠ»ΡΠ½ΠΎΡΡΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΡΠΎΡΡΠΈΠΉΡΠΊΠΎΠ³ΠΎ Π°Π²ΡΠΎΡΡΠ½ΠΊΠ°, Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡ ΠΊΠ°ΡΠ΄ΠΈΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΎΠ±Π½ΠΎΠ²Π»Π΅Π½ΠΈΡ ΠΌΠΎΠ΄Π΅Π»ΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΄Π° Π°Π²ΡΠΎΠΌΠΎΠ±ΠΈΠ»Π΅ΠΉ ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΈ, Π½Π°Π»ΠΈΡΠΈΠ΅ ΠΈΠ·Π±ΡΡΠΎΡΠ½ΡΡ
ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π΅Π½Π½ΡΡ
ΠΌΠΎΡΠ½ΠΎΡΡΠ΅ΠΉ ΠΈ ΡΡ
ΠΎΠ΄ ΠΈΠ· Π ΠΎΡΡΠΈΠΈ ΡΡΡΡ
Π·Π°ΡΡΠ±Π΅ΠΆΠ½ΡΡ
ΠΏΠ°ΡΡΠ½ΡΡΠΎΠ² ΠΠ Β«Π‘ΠΎΠ»Π»Π΅ΡΡΒ» ΠΏΠΎ ΡΠΎΠ²ΠΌΠ΅ΡΡΠ½ΡΠΌ ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΡΠΌ β ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΉ Fiat, SsangYong ΠΈ Ford. ΠΡΠΎΠ±ΠΎΠ΅ Π²Π½ΠΈΠΌΠ°Π½ΠΈΠ΅ Π² ΡΡΠ°ΡΡΠ΅ ΡΠ΄Π΅Π»Π΅Π½ΠΎ ΠΏΠ°ΡΡΠ½ΡΡΡ ΠΏΠΎ ΡΠΎΠ²ΠΌΠ΅ΡΡΠ½ΠΎΠΌΡ ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΡ Ρ ΠΠΠ Β«Π‘ΠΎΠ»Π»Π΅ΡΡΒ» ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΈ Ford, ΠΊΠΎΡΠΎΡΠ°Ρ ΠΏΠΎΠΊΠΈΠ½ΡΠ»Π° ΠΎΡΠ΅ΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΠΉ ΡΡΠ½ΠΎΠΊ Π² 2019 Π³ΠΎΠ΄Ρ. ΠΡΠΎ ΡΠΎΠ±ΡΡΠΈΠ΅, Π½Π΅Π³Π°ΡΠΈΠ²Π½ΠΎ ΠΎΡΡΠ°Π·ΠΈΠ²ΡΠ΅Π΅ΡΡ Π½Π° ΠΏΠ°ΡΡΠ½ΡΡΠ°Ρ
ΠΈ ΠΊΠ»ΠΈΠ΅Π½ΡΠ°Ρ
ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΈ, Π±ΡΠ»ΠΎ ΠΎΠ±ΡΡΠ»ΠΎΠ²Π»Π΅Π½ΠΎ ΡΠ΅Π»ΡΠΌ ΡΡΠ΄ΠΎΠΌ ΠΎΠ±ΡΡΠΎΡΡΠ΅Π»ΡΡΡΠ². ΠΡΠΎΠΌΠ΅ ΡΠΎΠ³ΠΎ, Π² ΡΡΠ°ΡΡΠ΅ Π²ΡΡΠ²Π»Π΅Π½Ρ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΡΠΎΠ²ΠΌΠ΅ΡΡΠ½ΡΡ
ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΉ Mazda Sollers ΠΈ Ford Sollers (Π² ΡΠ°ΡΡΠΈ Π΅Π΄ΠΈΠ½ΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΠΎΡΡΠ°Π²ΡΠ΅ΠΉΡΡ Π² ΡΠΎΡΡΠΈΠΉΡΠΊΠΎΠΌ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π΅ ΠΌΠΎΠ΄Π΅Π»ΠΈ Ford β ΠΌΠΈΠΊΡΠΎΠ°Π²ΡΠΎΠ±ΡΡΠ° Ford Transit) ΠΈ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠΈ ΡΠ°ΡΡΠΈΡΠ΅Π½ΠΈΡ ΠΈΡ
ΡΠΊΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π»Π°, Π² ΡΠΎΠΌ ΡΠΈΡΠ»Π΅ Π·Π° ΡΡΡΡ ΡΠΊΡΠΏΠΎΡΡΠ° Π΄Π²ΠΈΠ³Π°ΡΠ΅Π»Π΅ΠΉ, Π·Π°ΠΏΠ°ΡΠ½ΡΡ
ΡΠ°ΡΡΠ΅ΠΉ ΠΈ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΡΡΡΠΈΡ
.ΠΡΠΈΡΡΠ°Π»ΡΠ½ΠΎΠ΅ Π²Π½ΠΈΠΌΠ°Π½ΠΈΠ΅ Π² ΡΡΠ°ΡΡΠ΅ ΡΠ΄Π΅Π»Π΅Π½ΠΎ Π²Π½Π΅Π΄ΡΠ΅Π½ΠΈΡ Π½ΠΎΠ²ΡΡ
ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΉ Π² ΠΠΠ Β«Π‘ΠΎΠ»Π»Π΅ΡΡΒ», ΡΠ°Π·Π²ΠΈΡΠΈΡ ΡΠΈΡΡΠΎΠ²ΠΈΠ·Π°ΡΠΈΠΈ Π² ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ΅ ΠΈ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π΅ Π½ΠΎΠ²ΡΡ
ΠΌΠΎΠ΄Π΅Π»Π΅ΠΉ, ΡΠΎΠ·Π΄Π°Π½ΠΈΡ ΡΠΎΠ±ΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΡΠ΅Π»Π΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΠ»Π°ΡΡΠΎΡΠΌΡ, ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡΠ΅ΠΉ ΠΏΠΎΠ΄ΠΊΠ»ΡΡΠΈΡΡ Π°Π²ΡΠΎΠΌΠΎΠ±ΠΈΠ»Ρ ΠΊ ΠΈΠ½ΡΠ΅ΡΠ½Π΅ΡΡ ΠΈ ΡΠΏΡΠ°Π²Π»ΡΡΡ ΠΈΠΌ Π΄ΠΈΡΡΠ°Π½ΡΠΈΠΎΠ½Π½ΠΎ, Π²ΠΊΠ»ΡΡΠ°Ρ Π·Π°ΠΏΡΡΠΊ Π΄Π²ΠΈΠ³Π°ΡΠ΅Π»Ρ.ΠΠ²ΡΠΎΡΠΎΠΌ ΠΏΠΎΠ΄ΡΠΎΠ±Π½ΠΎ ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½Π° Π½ΠΎΠ²Π°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ ΠΏΠΎΡΡΠ΅Π±Π»Π΅Π½ΠΈΡ Π½Π° Π°Π²ΡΠΎΡΡΠ½ΠΊΠ΅, ΡΠ²ΡΠ·Π°Π½Π½Π°Ρ Ρ ΠΎΡΠΊΠ°Π·ΠΎΠΌ ΠΏΠΎΠΊΡΠΏΠ°ΡΠ΅Π»Π΅ΠΉ ΠΎΡ Π²Π»Π°Π΄Π΅Π½ΠΈΡ Π°Π²ΡΠΎΠΌΠΎΠ±ΠΈΠ»Π΅ΠΌ ΠΈ Π²ΡΠ±ΠΎΡΠΎΠΌ Π½ΠΎΠ²ΡΡ
ΡΡΠ»ΡΠ³ ΠΏΠΎ ΠΏΠΎΠ΄ΠΏΠΈΡΠΊΠ΅ ΠΈ ΠΎΠ±ΠΌΠ΅Π½Ρ Π°Π²ΡΠΎΠΌΠΎΠ±ΠΈΠ»Π΅ΠΉ, ΠΈΡ
ΡΠ°Π·Π²ΠΈΡΠΈΠ΅ΠΌ Π½Π° Π·Π°ΡΡΠ±Π΅ΠΆΠ½ΠΎΠΌ ΠΈ ΠΎΡΠ΅ΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΌ ΡΡΠ½ΠΊΠ°Ρ
, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΏΡΠΎΠ²Π΅Π΄ΡΠ½ Π°Π½Π°Π»ΠΈΠ· ΡΡΠΏΠ΅Ρ
ΠΎΠ² ΠΈ Π½Π΅ΡΠ΄Π°Ρ Π·Π°ΡΡΠ±Π΅ΠΆΠ½ΡΡ
Π°Π²ΡΠΎΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΠΈΡΠ΅Π»Π΅ΠΉ ΠΏΠΎ ΠΏΡΠ΅Π΄ΠΎΡΡΠ°Π²Π»Π΅Π½ΠΈΡ ΡΡΠ»ΡΠ³ ΠΏΠΎ ΠΏΠΎΠ΄ΠΏΠΈΡΠΊΠ΅.ΠΠ»Π°Π²Π½ΠΎΠΉ ΡΠ΅Π»ΡΡ ΡΡΠ°ΡΡΠΈ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΡΡΠ°ΡΠ΅Π³ΠΈΠΈ ΠΠΠ Β«Π‘ΠΎΠ»Π»Π΅ΡΡΒ» Π½Π° ΠΎΡΠ΅ΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΌ ΠΈ Π·Π°ΡΡΠ±Π΅ΠΆΠ½ΡΡ
ΡΡΠ½ΠΊΠ°Ρ
, Π²ΡΠΏΠΎΠΌΠΎΠ³Π°ΡΠ΅Π»ΡΠ½ΡΠΌΠΈ ΡΠ΅Π»ΡΠΌΠΈ β Π°Π½Π°Π»ΠΈΠ· ΠΎΡΠ΅ΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΡΡΠ½ΠΊΠ°, ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΏΠΎΡΡΠ΅Π±Π»Π΅Π½ΠΈΡ ΠΈ ΠΏΡΠ΅Π΄ΠΎΡΡΠ°Π²Π»Π΅Π½ΠΈΡ Π½ΠΎΠ²ΡΡ
ΡΡΠ»ΡΠ³, ΠΈΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΠΏΡΠΈΡΠΈΠ½ ΡΡ
ΠΎΠ΄Π° Π·Π°ΡΡΠ±Π΅ΠΆΠ½ΡΡ
ΠΏΠ°ΡΡΠ½ΡΡΠΎΠ² ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΈ
Pancharatnam-Berry phase in condensate of indirect excitons
We report on the observation of the Pancharatnam-Berry phase in a condensate
of indirect excitons (IXs) in a GaAs coupled quantum well structure. The
Pancharatnam-Berry phase leads to phase shifts of interference fringes in IX
interference patterns. Correlations are found between the phase shifts,
polarization pattern of IX emission, and onset of IX spontaneous coherence. The
Pancharatnam-Berry phase is acquired due to coherent spin precession in IX
condensate. The effect of the Pancharatnam-Berry phase on the IX phase pattern
is described in terms of an associated momentum.Comment: 6 pages, 5 figures + 2 pages supplemental material, 3 supplemental
figure
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