1
|
Leermakers I, Rubi K, Yang M, Kerdi B, Goiran M, Escoffier W, Rana AS, Smink AEM, Brinkman A, Hilgenkamp H, Maan JC, Zeitler U. Quantum oscillations in an optically-illuminated two-dimensional electron system at the LaAlO 3/SrTiO 3interface. J Phys Condens Matter 2021; 33:465002. [PMID: 34433152 DOI: 10.1088/1361-648x/ac211a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 08/25/2021] [Indexed: 06/13/2023]
Abstract
We have investigated the illumination effect on the magnetotransport properties of a two-dimensional electron system at the LaAlO3/SrTiO3interface. The illumination significantly reduces the zero-field sheet resistance, eliminates the Kondo effect at low-temperature, and switches the negative magnetoresistance into the positive one. A large increase in the density of high-mobility carriers after illumination leads to quantum oscillations in the magnetoresistance originating from the Landau quantization. The carrier density (∼2 × 1012 cm-2) and effective mass (∼1.7me) estimated from the oscillations suggest that the high-mobility electrons occupy thedxz/yzsubbands of Ti:t2gorbital extending deep within the conducting sheet of SrTiO3. Our results demonstrate that the illumination which induces additional carriers at the interface can pave the way to control the Kondo-like scattering and study the quantum transport in the complex oxide heterostructures.
Collapse
Affiliation(s)
- I Leermakers
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands
| | - K Rubi
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands
| | - M Yang
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), Université de Toulouse, CNRS, INSA, UPS, 143 Avenue de Rangueil, 31400 Toulouse, France
| | - B Kerdi
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), Université de Toulouse, CNRS, INSA, UPS, 143 Avenue de Rangueil, 31400 Toulouse, France
| | - M Goiran
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), Université de Toulouse, CNRS, INSA, UPS, 143 Avenue de Rangueil, 31400 Toulouse, France
| | - W Escoffier
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), Université de Toulouse, CNRS, INSA, UPS, 143 Avenue de Rangueil, 31400 Toulouse, France
| | - A S Rana
- MESA + Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - A E M Smink
- MESA + Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - A Brinkman
- MESA + Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - H Hilgenkamp
- MESA + Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - J C Maan
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands
| | - U Zeitler
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands
| |
Collapse
|
2
|
Halbmayer WM, Hopmeier P, Feichtinger C, Rubi K, Fischer M. Histidine-Rich Glycoprotein (HRG) in Uncomplicated Pregnancy and Mild and Moderate Preeclampsia. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1648499] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- W M Halbmayer
- Central Laboratory, Municipal Hospital of the City of Vienna-Lainz, A-1130 Vienna, Austria
| | - P Hopmeier
- Central Laboratory, Municipal Hospital Rudolfstiftung, Vienna
| | - C Feichtinger
- Central Laboratory, Municipal Hospital of the City of Vienna-Lainz, A-1130 Vienna, Austria
| | - K Rubi
- Central Laboratory, Kaiserin-Elisabeth Hospital, Vienna
| | - M Fischer
- Central Laboratory, Municipal Hospital of the City of Vienna-Lainz, A-1130 Vienna, Austria
| |
Collapse
|
3
|
Halbmayer WM, Mannhalter C, Feichtinger C, Rubi K, Fischer M. The prevalence of factor XII deficiency in 103 orally anticoagulated outpatients suffering from recurrent venous and/or arterial thromboembolism. Thromb Haemost 1992; 68:285-90. [PMID: 1440493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
One hundred and three patients suffering from recurrent venous thrombosis, recurrent arterial thromboembolism and/or recurrent myocardial infarction and 50 healthy subjects were tested for Hageman factor (FXII) coagulant activity and antigen. Among the 103 patients we identified 15 subjects with FXII deficiency (15%), 3 with protein C deficiency (3%) and 3 with protein S deficiency (3%). Combined FXII and protein C, protein S or antithrombin III deficiency was not observed. The 103 patients were divided into subgroups according to the type of thrombotic complication. Among patients with exclusively recurrent venous thromboembolism 8% (p = 0.153) were deficient in FXII. Among patients suffering from recurrent arterial thromboembolism and/or myocardial infarction, the incidence of FXII deficiency was significantly higher (20%, p less than 0.003). In 67% of the patients with FXII deficiency a positive family history of thrombosis could be established. In contrast, only 32% of all venous and 28% of all arterial thrombosis patients had a positive family history. We believe that reduced levels of FXII should be considered as a risk factor in the development of thromboembolism. Consequently, more attention should be payed to the measurement of FXII when evaluating thromboembolic risk factors especially in cases of recurrent arterial thromboembolism and/or myocardial infarction.
Collapse
Affiliation(s)
- W M Halbmayer
- Central Laboratory, Municipal Hospital Vienna-Lainz, Austria
| | | | | | | | | |
Collapse
|
4
|
Halbmayer WM, Hopmeier P, Feichtinger C, Rubi K, Fischer M. Histidine-rich glycoprotein (HRG) in uncomplicated pregnancy and mild and moderate preeclampsia. Thromb Haemost 1992; 67:585-6. [PMID: 1519219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
5
|
Halbmayer WM, Feichtinger C, Rubi K, Fischer M. [Functional protein S in 77 patients treated with anticoagulants and in 32 probands with normal coagulation parameters]. Med Klin (Munich) 1992; 87:109-12, 158. [PMID: 1533702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We determined functional protein S with a new automated clotting assay, total protein S antigen with the Laurell technique and free protein S antigen with an ELISA test and calculated the ratio of total protein S antigen and prothrombin antigen (Laurell) of plasmas of 77 patients oral anticoagulant therapy and of 32 normals. The correlation of total protein S antigen with protein S activity was found to be r = 0.857. The normal range of the tests was calculated for orally anticoagulated patients and for normals and was compared with the analytical data from 4 orally anticoagulated, congenital protein S deficiency patients. We believe that the automated functional protein S clotting assay is a quick and easily performed test, which now allows even for protein S the use of a functional assay as the first step for the screening of coagulation inhibitor deficiencies.
Collapse
Affiliation(s)
- W M Halbmayer
- Zentrallaboratorium, Krankenhauses der Stadt Wien-Lainz
| | | | | | | |
Collapse
|
6
|
Halbmayer WM, Hopmeier P, Mannhalter C, Heuss F, Leodolter S, Rubi K, Fischer M. C1-esterase inhibitor in uncomplicated pregnancy and mild and moderate preeclampsia. Thromb Haemost 1991; 65:134-8. [PMID: 2053098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Routine coagulation tests and measurement of the plasma levels of C1-esterase inhibitor (C1-INH) and antithrombin III were performed in 17 women with mild preeclampsia, 10 women with moderate preeclampsia and 20 women with uncomplicated pregnancy. All pregnant probands were within the third trimester of pregnancy. 20 non-pregnant women were used as controls. The groups were matched in age and the pregnant ones were also matched in gestational age. C1-INH activity and antigen were significantly reduced (p less than 0.002) in normally pregnant women as compared with non-pregnant ones. Further, C1-INH activity was lower in women with mild preeclampsia and significantly lower in women with moderate preeclampsia (p less than 0.05) as compared with normally pregnant women. None of the plasmatic coagulation tests was indicative of a consumption reaction. We conclude that C1-INH activity and antigen reductions are commonly associated with pregnancy. Furthermore, as markedly lower values can be found in mild and moderate preeclampsia, measurement of the C1-INH activity in pregnant women within the third trimester might proof useful to establish the diagnosis of a preeclamptic condition.
Collapse
Affiliation(s)
- W M Halbmayer
- Central Laboratory, Municipal Hospital of the City of Vienna-Lainz, Austria
| | | | | | | | | | | | | |
Collapse
|