| Records |
| Author |
Shafiei, M.; Fazileh, F.; Peeters, F.M.; Milošević, M.V. |
| Title |
Floquet engineering of axion and high-Chern number phases in a topological insulator under illumination |
Type |
A1 Journal article |
| Year |
2024 |
Publication |
SciPost Physics Core |
Abbreviated Journal |
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| Volume |
7 |
Issue |
7 |
Pages |
024-16 |
| Keywords |
A1 Journal article; Condensed Matter Theory (CMT) |
| Abstract |
Quantum anomalous Hall, high-Chern number, and axion phases in topological insulators are characterized by its Chern invariant C (respectively, C = 1, integer C > 1, and C = 0 with half-quantized Hall conductance of opposite signs on top and bottom surfaces). They are of recent interest because of novel fundamental physics and prospective applications, but identifying and controlling these phases has been challenging in practice. Here we show that these states can be created and switched between in thin films of Bi2Se3 by Floquet engineering, using irradiation by circularly polarized light. We present the calculated phase diagrams of encountered topological phases in Bi2Se3, as a function of wavelength and amplitude of light, as well as sample thickness, after properly taking into account the penetration depth of light and the variation of the gap in the surface states. These findings open pathways towards energy-efficient optoelectronics, advanced sensing, quantum information processing and metrology. |
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Wos |
001217885300001 |
Publication Date  |
2024-05-01 |
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Additional Links |
UA library record; WoS full record |
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Open Access |
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Approved |
Most recent IF: NA |
| Call Number |
UA @ admin @ c:irua:205972 |
Serial |
9151 |
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| Author |
Faraji, F.; Neyts, E.C.; Milošević, M.V.; Peeters, F.M. |
| Title |
Capillary Condensation of Water in Graphene Nanocapillaries |
Type |
A1 Journal Article |
| Year |
2024 |
Publication |
Nano Letters |
Abbreviated Journal |
Nano Lett. |
| Volume |
24 |
Issue |
18 |
Pages |
5625-5630 |
| Keywords |
A1 Journal Article; CMT |
| Abstract |
Recent experiments have revealed that the macroscopic Kelvin equation remains surprisingly accurate even for nanoscale capillaries. This phenomenon was so far explained by the oscillatory behavior of the solid−liquid interfacial free energy. We here demonstrate thermodynamic and capillarity inconsistencies with this explanation. After revising the Kelvin equation, we ascribe its validity at nanoscale confinement to the effect of disjoining pressure.
To substantiate our hypothesis, we employed molecular dynamics simulations to evaluate interfacial heat transfer and wetting properties. Our assessments unveil a breakdown in a previously established proportionality between the work of adhesion and the Kapitza conductance at capillary heights below 1.3 nm, where the dominance of the work of adhesion shifts primarily from energy to entropy. Alternatively, the peak density of the initial water layer can effectively probe the work of adhesion. Unlike under bulk conditions, high confinement renders the work of adhesion entropically unfavorable. |
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Publication Date |
2024-05-08 |
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Series Issue |
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Edition |
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| ISSN |
1530-6984 |
ISBN |
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Additional Links |
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| Impact Factor |
10.8 |
Times cited |
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Open Access |
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| Notes |
This work was supported by Research Foundation-Flanders (FWO, project No. G099219N). The computational resources used in this work were provided by the HPC core facility CalcUA of the University of Antwerp, and the Flemish Supercomputer Center (VSC), funded by FWO and the Flemish Government. |
Approved |
Most recent IF: 10.8; 2024 IF: 12.712 |
| Call Number |
UA @ lucian @ |
Serial |
9123 |
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| Author |
Sethu, K.K.V.; Yasin, F.; Swerts, J.; Sorée, B.; De Boeck, J.; Kar, G.S.; Garello, K.; Couet, S. |
| Title |
Spin-orbit torque vector quantification in nanoscale magnetic tunnel junctions |
Type |
A1 Journal article |
| Year |
2024 |
Publication |
ACS nano |
Abbreviated Journal |
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| Volume |
18 |
Issue |
21 |
Pages |
13506-13516 |
| Keywords |
A1 Journal article; Engineering sciences. Technology; Condensed Matter Theory (CMT) |
| Abstract |
Spin-orbit torques (SOT) allow ultrafast, energy-efficient toggling of magnetization state by an in-plane charge current for applications such as magnetic random-access memory (SOT-MRAM). Tailoring the SOT vector comprising of antidamping (T-AD) and fieldlike (T-FL) torques could lead to faster, more reliable, and low-power SOT-MRAM. Here, we establish a method to quantify the longitudinal (T-AD) and transverse (T-FL) components of the SOT vector and its efficiency chi(AD) and chi(FL), respectively, in nanoscale three-terminal SOT magnetic tunnel junctions (SOT-MTJ). Modulation of nucleation or switching field (B-SF) for magnetization reversal by SOT effective fields (B-SOT) leads to the modification of SOT-MTJ hysteresis loop behavior from which chi(AD) and chi(FL) are quantified. Surprisingly, in nanoscale W/CoFeB SOT-MTJ, we find chi(FL) to be (i) twice as large as chi(AD) and (ii) 6 times as large as chi(FL) in micrometer-sized W/CoFeB Hall-bar devices. Our quantification is supported by micromagnetic and macrospin simulations which reproduce experimental SOT-MTJ Stoner-Wohlfarth astroid behavior only for chi(FL) > chi(AD). Additionally, from the threshold current for current-induced magnetization switching with a transverse magnetic field, we show that in SOT-MTJ, T-FL plays a more prominent role in magnetization dynamics than T-AD. Due to SOT-MRAM geometry and nanodimensionality, the potential role of nonlocal spin Hall spin current accumulated adjacent to the SOT-MTJ in the mediation of T-FL and chi(FL) amplification merits to be explored. |
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Wos |
001226121700001 |
Publication Date |
2024-05-15 |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
1936-0851 |
ISBN |
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Additional Links |
UA library record; WoS full record |
| Impact Factor |
17.1 |
Times cited |
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Open Access |
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| Notes |
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Approved |
Most recent IF: 17.1; 2024 IF: 13.942 |
| Call Number |
UA @ admin @ c:irua:205980 |
Serial |
9173 |
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| Author |
Faraji, F.; Neyts, E.C.; Milošević, M.V.; Peeters, F.M. |
| Title |
Comment on “Misinterpretation of the Shuttleworth equation” |
Type |
A1 Journal Article |
| Year |
2024 |
Publication |
Scripta Materialia |
Abbreviated Journal |
Scripta Materialia |
| Volume |
250 |
Issue |
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Pages |
116186 |
| Keywords |
A1 Journal Article; CMT |
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Publication Date |
2024-05-24 |
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Edition |
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| ISSN |
1359-6462 |
ISBN |
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Additional Links |
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| Impact Factor |
6 |
Times cited |
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Open Access |
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| Notes |
Research Foundation Flanders; |
Approved |
Most recent IF: 6; 2024 IF: 3.747 |
| Call Number |
UA @ lucian @ CMT |
Serial |
9116 |
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| Author |
Tong, J.; Fu, Y.; Domaretskiy, D.; Della Pia, F.; Dagar, P.; Powell, L.; Bahamon, D.; Huang, S.; Xin, B.; Costa Filho, R.N.; Vega, L.F.; Grigorieva, I.V.; Peeters, F.M.; Michaelides, A.; Lozada-Hidalgo, M. |
| Title |
Control of proton transport and hydrogenation in double-gated graphene |
Type |
A1 Journal Article |
| Year |
2024 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
630 |
Issue |
8017 |
Pages |
619-624 |
| Keywords |
A1 Journal Article; Condensed Matter Theory (CMT) ; |
| Abstract |
The basal plane of graphene can function as a selective barrier that is permeable to protons but impermeable to all ions and gases, stimulating its use in applications such as membranes, catalysis and isotope separation. Protons can chemically adsorb on graphene and hydrogenate it, inducing a conductor–insulator transition that has been explored intensively in graphene electronic devices. However, both processes face energy barriersand various strategies have been proposed to accelerate proton transport, for example by introducing vacancies, incorporating catalytic metalsor chemically functionalizing the lattice. But these techniques can compromise other properties, such as ion selectivity or mechanical stability. Here we show that independent control of the electric field,<italic>E</italic>, at around 1 V nm<sup>−1</sup>, and charge-carrier density,<italic>n</italic>, at around 1 × 10<sup>14</sup> cm<sup>−2</sup>, in double-gated graphene allows the decoupling of proton transport from lattice hydrogenation and can thereby accelerate proton transport such that it approaches the limiting electrolyte current for our devices. Proton transport and hydrogenation can be driven selectively with precision and robustness, enabling proton-based logic and memory graphene devices that have on–off ratios spanning orders of magnitude. Our results show that field effects can accelerate and decouple electrochemical processes in double-gated 2D crystals and demonstrate the possibility of mapping such processes as a function of<italic>E</italic>and<italic>n</italic>, which is a new technique for the study of 2D electrode–electrolyte interfaces. |
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Wos |
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Publication Date |
2024-06-20 |
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Edition |
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| ISSN |
0028-0836 |
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Additional Links |
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| Impact Factor |
64.8 |
Times cited |
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Open Access |
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| Notes |
This work was supported by UKRI (EP/X017745: M.L.-H; EP/X035891: A.M.), the Directed Research Projects Program of the Research and Innovation Center for Graphene and 2D Materials at Khalifa University (RIC2D-D001: M.L.-H., L.F.V. and D.B.), The Royal Society (URF\R1\201515: M.L.-H.) and the European Research Council (101071937: A.M.). Part of this work was supported by the Flemish Science Foundation (FWO-Vl, G099219N). A.M. acknowledges access to the UK national high-performance computing service (ARCHER2). |
Approved |
Most recent IF: 64.8; 2024 IF: 40.137 |
| Call Number |
CMT @ cmt @ |
Serial |
9247 |
| Permanent link to this record |
