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Number of results: 4
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Hipoteza Brody w swietle wyników badan empirycznych

Henryk Gurgul Tomasz Wójtowicz
Przegląd Statystyczny/Statistical Review | 2012 | No 1
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Authors and Affiliations

Henryk Gurgul
Tomasz Wójtowicz

The Impact of US Macroeconomic News on the Prices of Single Stocks on the Vienna Stock Exchange

Tomasz Wójtowicz Henryk Gurgul Christoph Mitterer
Central European Journal of Economic Modelling and Econometrics | 2021 | No 3 | 287-329 | DOI: 10.24425/cejeme.2021.139799
Keywords event study macroeconomic announcements intraday data
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Abstract

Recent studies have shown that announcements of information about the
state of the US economy have had a significant impact on European stock
markets. However, the importance of information about the US economy may
vary in time. In order to analyze this issue, we examine the impact of
announcements of unexpected US macroeconomic news on the prices of
selected stocks listed on the Vienna Stocks Exchange. On the basis of
the 5-minute returns of 13 stocks we examine how the strength and the
significance of the reactions of investors to unexpected macroeconomic
news from the US has changed over the last 15 years. Event study
methodology allows us to describe precisely such reactions in the first
minutes after news announcements.
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Authors and Affiliations

Tomasz Wójtowicz
1
Henryk Gurgul
1
Christoph Mitterer
2
  1. Department of Applications of Mathematics in Economics, Faculty of Management, AGH University of Science and Technology, Cracow, Poland
  2. Capital Solutions Advisory GmbH, Graz, Austria

Magnetospectroscopy of CdTe/Cd 1-xMg xTe modulation-doped quantum wells in THz and visible range

Jerzy Łusakowski Maciej Zaremba Adam Siemaszko Krzysztof Karpierz Zbigniew Adamus Tomasz Wojtowicz
Opto-Electronics Review | 2023 | 31 | 2 | e144597 | DOI: 10.24425/opelre.2023.144597
Keywords terahertz spectroscopy optically detected cyclotron resonance modulation-doped CdTe quantum wells
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Abstract

Transport, photoluminescence, THz transmission, and optically detected cyclotron resonance studies were carried out on samples with a single modulation-doped CdTe/Cd 1-xMg xTe quantum well. THz experiments were performed at liquid helium temperatures for photon energies between about 0.5 meV and 3.5 meV. An effective mass of electron was determined to be (0.1020±0.0003)m 0. Observed photoluminescence and optically detected cyclotron resonance spectra cannot be explained within the simple model of Landau quantization of parabolic bands.
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Authors and Affiliations

Jerzy Łusakowski
1
ORCID: ORCID
Maciej Zaremba
1
Adam Siemaszko
1
Krzysztof Karpierz
1
Zbigniew Adamus
2 3
ORCID: ORCID
Tomasz Wojtowicz
4
ORCID: ORCID
  1. Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
  2. Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland
  3. International Research Centre Mag Top, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland
  4. International Research Centre Mag Top, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland

Terahertz response of CdTe/Cd 1-xMg xTe modulation-doped multiple quantum wells

Jerzy Łusakowski Andrzej Frączak Mikołaj Grymuza Eryk Imos Adam Siemaszko Wiktoria Solarska Aniela Woyciechowska Maciej Zaremba Rafał Zdunek Krzysztof Karpierz Zbigniew Adamus Tomasz Słupiński Tomasz Wojtowicz
Opto-Electronics Review | 2023 | 31 | 2 | e144600 | DOI: 10.24425/opelre.2023.144600
Keywords terahertz spectroscopy Shubnikov-de Haas oscillations modulation-doped multiple CdTe-based quantum wells
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Abstract

Terahertz (THz) transmission, photoresistance, and electrical conductivity experiments were carried out at 4.2 K on a sample with modulation-doped CdTe/Cd 1-xMg xTe multiple quantum wells. The measurements were carried out as a function of a magnetic field B up to 9 T and a radiation frequency between 0.1 and 0.66 THz. A broad minimum in the transmission curve was observed at magnetic fields corresponding to the cyclotron resonance at given THz frequency which was followed at larger fields by an oscillatory signal, periodic in B −1. Shubnikov-de Haas oscillations were observed in magnetoconductivity and in photoresistance. Each of these experimental signals revealed the same electron concentration equal to (1.01 ± 0.03) ∙1012 cm −2. THz spectroscopy results are compared with data obtained on a single quantum well and are discussed from the point of view of using such multiple quantum wells as THz optical elements.
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Authors and Affiliations

Jerzy Łusakowski
1 2
ORCID: ORCID
Andrzej Frączak
1
Mikołaj Grymuza
1
Eryk Imos
1
Adam Siemaszko
1
Wiktoria Solarska
1
Aniela Woyciechowska
1
Maciej Zaremba
1
Rafał Zdunek
1
Krzysztof Karpierz
1
Zbigniew Adamus
3 4
ORCID: ORCID
Tomasz Słupiński
3 4
ORCID: ORCID
Tomasz Wojtowicz
3
ORCID: ORCID
  1. Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
  2. CENTERA Laboratories, Institute of High-Pressure Physics, Polish Academy of Sciences, Sokołowska 29, 01-142 Warsaw, Poland
  3. International Research Centre Mag Top, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland
  4. Institute of Physics,Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland

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