Zobrazeno 1 - 10
of 137
pro vyhledávání: '"Hartmut Buhmann"'
Autor:
Li‐Xian Wang, Wouter Beugeling, Fabian Schmitt, Lukas Lunczer, Julian‐Benedikt Mayer, Hartmut Buhmann, Ewelina M. Hankiewicz, Laurens W. Molenkamp
Publikováno v:
Advanced Science, Vol 11, Iss 19, Pp n/a-n/a (2024)
Abstract The band inversion of topological materials in three spatial dimensions is intimately connected to the parity anomaly of 2D massless Dirac fermions, known from quantum field theory. At finite magnetic fields, the parity anomaly reveals itsel
Externí odkaz:
https://doaj.org/article/a4bd35ca2729427a9ce0c504a6f20b6f
Autor:
Saquib Shamim, Pragya Shekhar, Wouter Beugeling, Jan Böttcher, Andreas Budewitz, Julian-Benedikt Mayer, Lukas Lunczer, Ewelina M. Hankiewicz, Hartmut Buhmann, Laurens W. Molenkamp
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-7 (2022)
The quantum spin Hall effect disappears at high magnetic fields when the band inversion is lifted. The authors demonstrate that in contrast, in disordered samples, counter-propagating topological and quantum Hall edge channels prevent the detection o
Externí odkaz:
https://doaj.org/article/049748c607b643b38505fc68e890857c
Autor:
Saquib Shamim, Wouter Beugeling, Pragya Shekhar, Kalle Bendias, Lukas Lunczer, Johannes Kleinlein, Hartmut Buhmann, Laurens W. Molenkamp
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-6 (2021)
The quantum spin Hall effect is expected not to survive the presence of magnetic impurities. Here, authors report full quantization at very low temperatures in HgTe quantum wells alloyed with a few percent of magnetic Mn atoms, due to Kondo screening
Externí odkaz:
https://doaj.org/article/0ad6a021e1324eeea717ef9f729304a8
Autor:
Yaakov Kleeorin, Holger Thierschmann, Hartmut Buhmann, Antoine Georges, Laurens W. Molenkamp, Yigal Meir
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-8 (2019)
Advances in nanotechnology make it possible to probe traditionally macroscopic notions of thermodynamics at the mesoscopic scale. Here the authors propose a method that can determine the entropy of a quantum dot system from transport measurements.
Externí odkaz:
https://doaj.org/article/14fe933c36814624928603fd16c0e02a
Autor:
David M. Mahler, Julian-Benedikt Mayer, Philipp Leubner, Lukas Lunczer, Domenico Di Sante, Giorgio Sangiovanni, Ronny Thomale, Ewelina M. Hankiewicz, Hartmut Buhmann, Charles Gould, Laurens W. Molenkamp
Publikováno v:
Physical Review X, Vol 9, Iss 3, p 031034 (2019)
Preceded by the discovery of topological insulators, Dirac and Weyl semimetals have become a pivotal direction of research in contemporary condensed matter physics. While easily accessible from a theoretical viewpoint, these topological semimetals po
Externí odkaz:
https://doaj.org/article/1a9c72d3eb5941ae8359474352316320
Autor:
Christoph Brüne, Cornelius Thienel, Michael Stuiber, Jan Böttcher, Hartmut Buhmann, Elena G. Novik, Chao-Xing Liu, Ewelina M. Hankiewicz, Laurens W. Molenkamp
Publikováno v:
Physical Review X, Vol 4, Iss 4, p 041045 (2014)
We report magnetotransport studies on a gated strained HgTe device. This material is a three-dimensional topological insulator and exclusively shows surface-state transport. Remarkably, the Landau-level dispersion and the accuracy of the Hall quantiz
Externí odkaz:
https://doaj.org/article/508639b272b745c1bc954692c00240fa
Autor:
Jeroen B. Oostinga, Luis Maier, Peter Schüffelgen, Daniel Knott, Christopher Ames, Christoph Brüne, Grigory Tkachov, Hartmut Buhmann, Laurens W. Molenkamp
Publikováno v:
Physical Review X, Vol 3, Iss 2, p 021007 (2013)
Strained bulk HgTe is a three-dimensional topological insulator, whose surface electrons have a high mobility (∼30 000 cm^{2}/Vs), while its bulk is effectively free of mobile charge carriers. These properties enable a study of transport through it
Externí odkaz:
https://doaj.org/article/ea37857ec7e54378b0f9f40b164bb628
Autor:
Markus König, Matthias Baenninger, Andrei G. F. Garcia, Nahid Harjee, Beth L. Pruitt, C. Ames, Philipp Leubner, Christoph Brüne, Hartmut Buhmann, Laurens W. Molenkamp, David Goldhaber-Gordon
Publikováno v:
Physical Review X, Vol 3, Iss 2, p 021003 (2013)
The discovery of the quantum spin Hall (QSH) state, and topological insulators in general, has sparked strong experimental efforts. Transport studies of the quantum spin Hall state have confirmed the presence of edge states, showed ballistic edge tra
Externí odkaz:
https://doaj.org/article/c00f309efaa5472e99ddc75587066896
Autor:
David M. Mahler, Valentin L. Müller, Laurens W. Molenkamp, Cornelius Thienel, Wouter Beugeling, Jonas Wiedenmann, Hartmut Buhmann
Publikováno v:
Nano Letters
Magneto-transport measurements on gated high mobility heterostructures containing a 60 nm layer of tensile strained HgTe, a three-dimensional topological insulator, show well-developed Hall quantization from surface states both in the n- as well as i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::47f8d69e3b4092cdf9f5cffd006c9b99
https://doi.org/10.1021/acs.nanolett.1c02456
https://doi.org/10.1021/acs.nanolett.1c02456
Autor:
Pragya Shekhar, Saquib Shamim, Simon Hartinger, Raimund Schlereth, Volkmar Hock, Hartmut Buhmann, Johannes Kleinlein, Laurens W. Molenkamp
Publikováno v:
ACS applied materialsinterfaces.
We present a novel low-temperature (30
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::979a6a72bbdc9c2b0688bbb771c08536
https://pubmed.ncbi.nlm.nih.gov/35820660
https://pubmed.ncbi.nlm.nih.gov/35820660