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Showing 1 to 12 of 35 entries
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Topological quantum phase transition from mirror to time reversal symmetry protected topological insulator.

Nature communications

Mandal PS, Springholz G, Volobuev VV, Caha O, Varykhalov A, Golias E, Bauer G, Rader O, Sánchez-Barriga J.
PMID: 29042565
Nat Commun. 2017 Oct 17;8(1):968. doi: 10.1038/s41467-017-01204-0.

Topological insulators constitute a new phase of matter protected by symmetries. Time-reversal symmetry protects strong topological insulators of the Z

Observation of quantum-tunnelling-modulated spin texture in ultrathin topological insulator Bi2Se3 films.

Nature communications

Neupane M, Richardella A, Sánchez-Barriga J, Xu S, Alidoust N, Belopolski I, Liu C, Bian G, Zhang D, Marchenko D, Varykhalov A, Rader O, Leandersson M, Balasubramanian T, Chang TR, Jeng HT, Basak S, Lin H, Bansil A, Samarth N, Hasan MZ.
PMID: 24815418
Nat Commun. 2014 May 12;5:3841. doi: 10.1038/ncomms4841.

Understanding the spin-texture behaviour of boundary modes in ultrathin topological insulator films is critically essential for the design and fabrication of functional nanodevices. Here, by using spin-resolved photoemission spectroscopy with p-polarized light in topological insulator Bi2Se3 thin films, we...

Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi(1-x)Mn(x))2Se3.

Nature communications

Sánchez-Barriga J, Varykhalov A, Springholz G, Steiner H, Kirchschlager R, Bauer G, Caha O, Schierle E, Weschke E, Ünal AA, Valencia S, Dunst M, Braun J, Ebert H, Minár J, Golias E, Yashina LV, Ney A, Holý V, Rader O.
PMID: 26892831
Nat Commun. 2016 Feb 19;7:10559. doi: 10.1038/ncomms10559.

Magnetic doping is expected to open a band gap at the Dirac point of topological insulators by breaking time-reversal symmetry and to enable novel topological phases. Epitaxial (Bi(1-x)Mn(x))2Se3 is a prototypical magnetic topological insulator with a pronounced surface band...

Time-resolved magnetization dynamics of cross-tie domain walls in permalloy microstructures.

Journal of physics. Condensed matter : an Institute of Physics journal

Miguel J, Sánchez-Barriga J, Bayer D, Kurde J, Heitkamp B, Piantek M, Kronast F, Aeschlimann M, Dürr HA, Kuch W.
PMID: 21836205
J Phys Condens Matter. 2009 Dec 02;21(49):496001. doi: 10.1088/0953-8984/21/49/496001. Epub 2009 Nov 12.

We report on a picosecond time-resolved x-ray magnetic circular dichroic-photoelectron emission microscopy study of the evolution of the magnetization components of a microstructured permalloy platelet comprising three cross-tie domain walls. A laser-excited photoswitch has been used to apply a...

Strong Spin Dependence of Correlation Effects in Ni Due to Stoner Excitations.

Physical review letters

Sánchez-Barriga J, Ovsyannikov R, Fink J.
PMID: 30636126
Phys Rev Lett. 2018 Dec 28;121(26):267201. doi: 10.1103/PhysRevLett.121.267201.

Using high-resolution angle-resolved photoemission, we observe a strong spin-dependent renormalization and lifetime broadening of the quasiparticle excitations in the electronic band structure of Ni(111) in an energy window of ∼0.3  eV below the Fermi level. We derive a quantitative...

Large magnetic gap at the Dirac point in Bi.

Nature

Rienks EDL, Wimmer S, Sánchez-Barriga J, Caha O, Mandal PS, Růžička J, Ney A, Steiner H, Volobuev VV, Groiss H, Albu M, Kothleitner G, Michalička J, Khan SA, Minár J, Ebert H, Bauer G, Freyse F, Varykhalov A, Rader O, Springholz G.
PMID: 31853081
Nature. 2019 Dec;576(7787):423-428. doi: 10.1038/s41586-019-1826-7. Epub 2019 Dec 18.

Magnetically doped topological insulators enable the quantum anomalous Hall effect (QAHE), which provides quantized edge states for lossless charge-transport applications

Giant Rashba Splitting in Pb.

Advanced materials (Deerfield Beach, Fla.)

Volobuev VV, Mandal PS, Galicka M, Caha O, Sánchez-Barriga J, Di Sante D, Varykhalov A, Khiar A, Picozzi S, Bauer G, Kacman P, Buczko R, Rader O, Springholz G.
PMID: 27859857
Adv Mater. 2017 Jan;29(3). doi: 10.1002/adma.201604185. Epub 2016 Nov 17.

The topological properties of lead-tin chalcogenide topological crystalline insulators can be widely tuned by temperature and composition. It is shown that bulk Bi doping of epitaxial Pb

Prediction and observation of an antiferromagnetic topological insulator.

Nature

Otrokov MM, Klimovskikh II, Bentmann H, Estyunin D, Zeugner A, Aliev ZS, Gaß S, Wolter AUB, Koroleva AV, Shikin AM, Blanco-Rey M, Hoffmann M, Rusinov IP, Vyazovskaya AY, Eremeev SV, Koroteev YM, Kuznetsov VM, Freyse F, Sánchez-Barriga J, Amiraslanov IR, Babanly MB, Mamedov NT, Abdullayev NA, Zverev VN, Alfonsov A, Kataev V, Büchner B, Schwier EF, Kumar S, Kimura A, Petaccia L, Di Santo G, Vidal RC, Schatz S, Kißner K, Ünzelmann M, Min CH, Moser S, Peixoto TRF, Reinert F, Ernst A, Echenique PM, Isaeva A, Chulkov EV.
PMID: 31853084
Nature. 2019 Dec;576(7787):416-422. doi: 10.1038/s41586-019-1840-9. Epub 2019 Dec 18.

Magnetic topological insulators are narrow-gap semiconductor materials that combine non-trivial band topology and magnetic order

Strength of correlation effects in the electronic structure of iron.

Physical review letters

Sánchez-Barriga J, Fink J, Boni V, Di Marco I, Braun J, Minár J, Varykhalov A, Rader O, Bellini V, Manghi F, Ebert H, Katsnelson MI, Lichtenstein AI, Eriksson O, Eberhardt W, Dürr HA.
PMID: 20366340
Phys Rev Lett. 2009 Dec 31;103(26):267203. doi: 10.1103/PhysRevLett.103.267203. Epub 2009 Dec 23.

The strength of electronic correlation effects in the spin-dependent electronic structure of ferromagnetic bcc Fe(110) has been investigated by means of spin and angle-resolved photoemission spectroscopy. The experimental results are compared to theoretical calculations within the three-body scattering approximation...

Reversal of the circular dichroism in angle-resolved photoemission from Bi2Te3.

Physical review letters

Scholz MR, Sánchez-Barriga J, Braun J, Marchenko D, Varykhalov A, Lindroos M, Wang YJ, Lin H, Bansil A, Minár J, Ebert H, Volykhov A, Yashina LV, Rader O.
PMID: 23745908
Phys Rev Lett. 2013 May 24;110(21):216801. doi: 10.1103/PhysRevLett.110.216801. Epub 2013 May 22.

The helical Dirac fermions at the surface of topological insulators show a strong circular dichroism which has been explained as being due to either the initial-state spin angular momentum, the initial-state orbital angular momentum, or the handedness of the...

Is there a rashba effect in graphene on 3d ferromagnets?.

Physical review letters

Rader O, Varykhalov A, Sánchez-Barriga J, Marchenko D, Rybkin A, Shikin AM.
PMID: 19257554
Phys Rev Lett. 2009 Feb 06;102(5):057602. doi: 10.1103/PhysRevLett.102.057602. Epub 2009 Feb 06.

Graphene is considered a candidate material for spintronics. Recently, graphene grown on Ni(111) has been reported to show a Rashba effect which depends on the magnetization. By spin- and angle-resolved photoelectron spectroscopy, we investigate the preconditions for such an...

Electronic and magnetic properties of quasifreestanding graphene on Ni.

Physical review letters

Varykhalov A, Sánchez-Barriga J, Shikin AM, Biswas C, Vescovo E, Rybkin A, Marchenko D, Rader O.
PMID: 18999644
Phys Rev Lett. 2008 Oct 10;101(15):157601. doi: 10.1103/PhysRevLett.101.157601. Epub 2008 Oct 10.

For the purpose of recovering the intriguing electronic properties of freestanding graphene at a solid surface, graphene self-organized on a Au monolayer on Ni(111) is prepared and characterized by scanning tunneling microscopy. Angle-resolved photoemission reveals a gapless linear pi-band...

Showing 1 to 12 of 35 entries