Thilo Kopp
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View article: Band representations in Strongly Correlated Settings: The Kitaev Honeycomb Model
Band representations in Strongly Correlated Settings: The Kitaev Honeycomb Model Open
In the study of quantum spin liquids, the Kitaev model plays a pivotal role due to the fact that its ground state is exactly known as well as the fact that it may be realized in strongly frustrated materials such as $α$-RuCl${}_3$. While t…
View article: Topological phase transitions of interacting fermions in the presence of a commensurate magnetic flux
Topological phase transitions of interacting fermions in the presence of a commensurate magnetic flux Open
Motivated by recently reported magnetic-field induced topological phases in ultracold atoms and correlated Moiré materials, we investigate topological phase transitions in a minimal model consisting of interacting spinless fermions describ…
View article: Winding vectors of topological defects: multiband Chern numbers
Winding vectors of topological defects: multiband Chern numbers Open
Chern numbers can be calculated within a frame of vortex fields related to phase conventions of a wave function. In a band protected by gaps the Chern number is equivalent to the total number of flux carrying vortices. In the presence of t…
View article: Bad metal and negative compressibility transitions in a two-band Hubbard model
Bad metal and negative compressibility transitions in a two-band Hubbard model Open
We analyze the paramagnetic state of a two-band Hubbard model with finite Hund's coupling close to integer filling at $n=2$ in two spacial dimensions. Previously, a Mott metal-insulator transition was established at $n=2$ with a coexistenc…
View article: Winding vectors of topological defects: Multiband Chern numbers
Winding vectors of topological defects: Multiband Chern numbers Open
Chern numbers can be calculated within a frame of vortex fields related to phase conventions of a wave function. In a band protected by gaps the Chern number is equivalent to the total number of flux carrying vortices. In the presence of t…
View article: Bad metal and negative compressibility transitions in a two-band Hubbard\n model
Bad metal and negative compressibility transitions in a two-band Hubbard\n model Open
We analyze the paramagnetic state of a two-band Hubbard model with finite\nHund's coupling close to integer filling at $n=2$ in two spacial dimensions.\nPreviously, a Mott metal-insulator transition was established at $n=2$ with a\ncoexist…
View article: Magnetotransport of Functional Oxide Heterostructures Affected by Spin–Orbit Coupling: A Tale of Two‐Dimensional Systems
Magnetotransport of Functional Oxide Heterostructures Affected by Spin–Orbit Coupling: A Tale of Two‐Dimensional Systems Open
Oxide heterostructures allow for detailed studies of 2D electronic transport phenomena. Herein, different facets of magnetotransport in selected spin–orbit‐coupled systems are analyzed and characterized by their single‐band and multiband b…
View article: Signatures of Topological Phase Transitions in the S‐Wave Superconductor at Finite Temperature
Signatures of Topological Phase Transitions in the S‐Wave Superconductor at Finite Temperature Open
In two dimensions, an s‐wave superconductor in the presence of Rashba spin−orbit coupling possesses distinct topologically nontrivial ground‐state phases controlled by Zeeman splitting and band filling. These phases can be characterized in…
View article: Signatures of topological phase transitions in the s-wave superconductor\n at finite temperature
Signatures of topological phase transitions in the s-wave superconductor\n at finite temperature Open
In two dimensions, an s-wave superconductor in the presence of Rashba\nspin-orbit coupling possesses distinct topologically non-trivial ground state\nphases controlled by Zeeman splitting and band filling. These phases can be\ncharacterize…
View article: Magnetotransport of Functional Oxide Heterostructures Affected by\n Spin-Orbit Coupling: A Tale of Two-Dimensional Systems
Magnetotransport of Functional Oxide Heterostructures Affected by\n Spin-Orbit Coupling: A Tale of Two-Dimensional Systems Open
Oxide heterostructures allow for detailed studies of 2D electronic transport\nphenomena. Herein, different facets of magnetotransport in selected\nspin-orbit-coupled systems are analyzed and characterized by their single-band\nand multiban…
View article: Nonunique connection between bulk topological invariants and surface physics
Nonunique connection between bulk topological invariants and surface physics Open
At the heart of the study of topological insulators lies a fundamental\ndichotomy: topological invariants are defined in infinite systems, but surface\nstates as their main footprint only exist in finite systems. In the slab\ngeometry, nam…
View article: Magnetic Properties of LaAlO3/SrTiO3 Heterostructure Modelled on a Supercomputer
Magnetic Properties of LaAlO3/SrTiO3 Heterostructure Modelled on a Supercomputer Open
The oxide heterostructure composed of LaAlO3 (LAO) thin film on top of SrTiO3 (STO) substrate is the best known example of a system where a metallic state is formed in the STO layers next to the interface [1]. In the frame of present work …
View article: Supercurrent as a probe for topological superconductivity in magnetic adatom chains
Supercurrent as a probe for topological superconductivity in magnetic adatom chains Open
A magnetic adatom chain, proximity coupled to a conventional superconductor with spin-orbit coupling, exhibits locally an odd-parity, spin-triplet pairing amplitude. We show that the singlet-triplet junction, thus formed, leads to a net sp…
View article: Antilocalization at an oxide interface
Antilocalization at an oxide interface Open
The presence of spin-orbit coupling drives the anomalous magnetotransport at oxide interfaces and forms the basis for numerous intriguing properties of these 2D electron systems, such as topologically protected phases or anti-localization.…
View article: Supercurrent as a Probe for Topological Superconductivity in Magnetic Adatom Chains
Supercurrent as a Probe for Topological Superconductivity in Magnetic Adatom Chains Open
A magnetic adatom chain, proximity coupled to a conventional superconductor with spin-orbit coupling, exhibits locally an odd-parity, spin-triplet pairing amplitude. We show that the singlet-triplet junction, thus formed, leads to a net sp…
View article: Momentum-space spin texture in a topological superconductor
Momentum-space spin texture in a topological superconductor Open
A conventional superconductor with spin-orbit coupling turns into a\ntopological superconductor beyond a critical strength of the Zeeman energy. The\nspin-expectation values $\\mathbf{S}(\\mathbf{k})$ in momentum space trace this\ntransiti…
View article: Capacitance and compressibility of heterostructures with strong electronic correlations
Capacitance and compressibility of heterostructures with strong electronic correlations Open
Strong electronic correlations related to a repulsive local interaction suppress the electronic compressibility in a single-band model, and the capacitance of a corresponding metallic film is directly related to its electronic compressibil…
View article: Artificial atoms based on correlated materials
Artificial atoms based on correlated materials Open
Low-dimensional electron systems fabricated from quantum matter have in\nrecent years become available and are being explored with great intensity. This\narticle gives an overview of the fundamental properties of such systems and\nsummariz…
View article: Momentum-Space Spin-Texture Transition in a Magnetic Topological Insulator
Momentum-Space Spin-Texture Transition in a Magnetic Topological Insulator Open
The surface states of magnetic topological insulators exhibit a hedgehog-like spin texture in momentum space near the Dirac point. Making use of the basic theoretical formulation for Bi$_2$Se$_3$ in thin-film geometry where the exchange fi…
View article: Emergent Momentum-Space Skyrmion Texture on the Surface of Topological Insulators
Emergent Momentum-Space Skyrmion Texture on the Surface of Topological Insulators Open
The quantum anomalous Hall effect has been theoretically predicted and experimentally verified in magnetic topological insulators. In addition, the surface states of these materials exhibit a hedgehog-like "spin" texture in momentum space.…
View article: Hydrostatic pressure response of an oxide-based two-dimensional electron system
Hydrostatic pressure response of an oxide-based two-dimensional electron system Open
Two-dimensional electron systems with fascinating properties exist in multilayers of standard semiconductors, on helium surfaces, and in oxides. Compared to the two-dimensional (2D) electron gases of semiconductors, the 2D electron systems…
View article: Analysis of electronic and structural properties of surfaces and interfaces based on LaAlO3 and SrTiO3
Analysis of electronic and structural properties of surfaces and interfaces based on LaAlO3 and SrTiO3 Open
Recently, it was established that a two-dimensional electron system can arise at the interface between two oxide insulators LaAlO3 and SrTiO3. This paradigmatic example exhibits metallic behaviour and magnetic properties between non-magnet…