Louk Rademaker
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View article: Angular momentum of vortex-core Majorana zero modes
Angular momentum of vortex-core Majorana zero modes Open
Majorana zero modes (MZMs) are highly sought-after states with a possible application in quantum computation. Here, we show that vortex-core MZMs can carry a nontrivial angular momentum. This establishes new `flavors' of Majorana modes, in…
View article: Universal relation between residual resistivity and A coefficient in correlated metals
Universal relation between residual resistivity and A coefficient in correlated metals Open
The effects of strong electronic correlations and disorder are crucial for emergent phenomena such as unconventional superconductivity, metal-insulator transitions, and quantum criticality. While both are omnipresent in real materials, the…
View article: Concealed Mott criticality: Unifying the Kondo breakdown and doped charge-transfer insulators
Concealed Mott criticality: Unifying the Kondo breakdown and doped charge-transfer insulators Open
Theoretical Physics
View article: Concealed Mott Criticality: Unifying the Kondo Breakdown and Doped Charge-Transfer Insulators
Concealed Mott Criticality: Unifying the Kondo Breakdown and Doped Charge-Transfer Insulators Open
I show that the quantum critical points observed in heavy fermions (the `Kondo breakdown') and in doped cuprates can be understood in terms of concealed Mott criticality. In this picture, one species of electrons undergoes a Mott localizat…
View article: Pressure-tuned many-body phases through <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mrow> <mml:mrow> <mml:mi>Γ</mml:mi> </mml:mrow> </mml:mrow> </mml:mrow> </mml:math> -K valleytronics in moiré bilayer WSe<sub>2</sub>
Pressure-tuned many-body phases through -K valleytronics in moiré bilayer WSe<sub>2</sub> Open
Recent experiments in twisted bilayer transition-metal dichalcogenides have revealed a variety of strongly correlated phenomena. To theoretically explore their origin, we combine here ab initio calculations with correlated model approaches…
View article: Pressure-tuned many-body phases through $Γ$-K valleytronics in moiré bilayer WSe$_2$
Pressure-tuned many-body phases through $Γ$-K valleytronics in moiré bilayer WSe$_2$ Open
Recent experiments in twisted bilayer transition-metal dichalcogenides have revealed a variety of strongly correlated phenomena. To theoretically explore their origin, we combine here ab initio calculations with correlated model approaches…
View article: Topological superconductivity with mixed singlet-triplet pairing in moiré transition-metal-dichalcogenide bilayers
Topological superconductivity with mixed singlet-triplet pairing in moiré transition-metal-dichalcogenide bilayers Open
We investigate strong coupling topological superconductivity in twisted moiré bilayer WSe$_2$. Our approach is based on an effective $t$-$J$ model with displacement-field-dependent complex hoppings, which is treated with the variational Gu…
View article: Hall response of locally correlated two-dimensional electrons at low density
Hall response of locally correlated two-dimensional electrons at low density Open
We study the Hall constant in a homogeneous two-dimensional fluid of correlated electrons immersed in a perpendicular magnetic field, with special focus on the regime of low carrier density. The model consists of a one-band tight-binding m…
View article: Doping a Wigner-Mott insulator: Exotic charge orders in transition metal dichalcogenide moiré heterobilayers
Doping a Wigner-Mott insulator: Exotic charge orders in transition metal dichalcogenide moiré heterobilayers Open
The moiré pattern induced by lattice mismatch in transition metal dichalcogenide heterobilayers causes the formation of flat bands, where interactions dominate the kinetic energy. At fractional fillings of the flat valence band, the long-r…
View article: Universal Scaling near Band-Tuned Metal-Insulator Phase Transitions
Universal Scaling near Band-Tuned Metal-Insulator Phase Transitions Open
We present a theory for band-tuned metal-insulator transitions based on the Kubo formalism. Such a transition exhibits scaling of the resistivity curves in the regime where Tτ>1 or μτ>1, where τ is the scattering time and μ the chemical po…
View article: Hall response of locally correlated two-dimensional electrons at low density
Hall response of locally correlated two-dimensional electrons at low density Open
We study the Hall constant in a homogeneous two-dimensional fluid of correlated electrons immersed in a perpendicular magnetic field, with special focus on the regime of low carrier density. The model consists of a one-band tight-binding m…
View article: Determining spin-orbit coupling in graphene by quasiparticle interference imaging
Determining spin-orbit coupling in graphene by quasiparticle interference imaging Open
Inducing and controlling spin-orbit coupling (SOC) in graphene is key to create topological states of matter, and for the realization of spintronic devices. Placing graphene onto a transition metal dichalcogenide is currently the most succ…
View article: Kagome chiral spin liquid in transition metal dichalcogenide moiré bilayers
Kagome chiral spin liquid in transition metal dichalcogenide moiré bilayers Open
At n=3/4 filling of the moiré flat band, transition metal dichalcogenide (TMD) moiré bilayers will develop kagome charge order. We derive an effective spin model for the resulting localized spins and find that its further neighbor spin int…
View article: Schwinger boson study of the $J_1$-$J_2$-$J_3$ kagome Heisenberg antiferromagnet with Dzyaloshinskii-Moriya interactions
Schwinger boson study of the $J_1$-$J_2$-$J_3$ kagome Heisenberg antiferromagnet with Dzyaloshinskii-Moriya interactions Open
Schwinger boson mean field theory is a powerful approach to study frustrated magnetic systems which allows to distinguish long range magnetic orders from quantum spin liquid phases, where quantum fluctuations remain strong up to zero tempe…
View article: Determining spin-orbit coupling in graphene by quasiparticle interference imaging
Determining spin-orbit coupling in graphene by quasiparticle interference imaging Open
Inducing and controlling spin-orbit coupling (SOC) in graphene is key to create topological states of matter, and for the realization of spintronic devices. Placing graphene onto a transition metal dichalcogenide is currently the most succ…
View article: Kagome chiral spin liquid in transition metal dichalcogenide moiré bilayers
Kagome chiral spin liquid in transition metal dichalcogenide moiré bilayers Open
At $n=3/4$ filling of the moiré flat band, transition metal dichalcogenide moiré bilayers will develop kagome charge order. We derive an effective spin model for the resulting localized spins and find that its further neighbor spin interac…
View article: Observation of flat $Γ$ moiré bands in twisted bilayer WSe$_2$
Observation of flat $Γ$ moiré bands in twisted bilayer WSe$_2$ Open
The recent observation of correlated phases in transition metal dichalcogenide moiré systems at integer and fractional filling promises new insight into metal-insulator transitions and the unusual states of matter that can emerge near such…
View article: Doping a Wigner-Mott insulator: Exotic charge orders in transition-metal dichalcogenide moiré heterobilayers
Doping a Wigner-Mott insulator: Exotic charge orders in transition-metal dichalcogenide moiré heterobilayers Open
The moiré pattern induced by lattice mismatch in transition-metal dichalcogenide heterobilayers causes the formation of flat bands, where interactions dominate the kinetic energy. At fractional fillings of the flat valence band, the long-r…
View article: How to Recognize the Universal Aspects of Mott Criticality?
How to Recognize the Universal Aspects of Mott Criticality? Open
In this paper we critically discuss several examples of two-dimensional electronic systems displaying interaction-driven metal-insulator transitions of the Mott (or Wigner–Mott) type, including dilute two-dimension electron gases (2DEG) in…
View article: Spin-orbit coupling in transition metal dichalcogenide heterobilayer flat bands
Spin-orbit coupling in transition metal dichalcogenide heterobilayer flat bands Open
The valence flat bands in transition metal dichalcogenide (TMD)\nheterobilayers are shown to exhibit strong intralayer spin-orbit coupling. This\nis reflected in a simple tight-binding model with spin-dependent complex\nhoppings based on t…
View article: Scaling theory of few-particle delocalization
Scaling theory of few-particle delocalization Open
We develop a scaling theory of interaction-induced delocalization of few-particle states in disordered quantum systems. In the absence of interactions, all single-particle states are localized in $d<3$, while in $d \geq 3$ there is a criti…
View article: Spin-Orbit Coupling in Transition Metal Dichalcogenide Heterobilayer Flat Bands
Spin-Orbit Coupling in Transition Metal Dichalcogenide Heterobilayer Flat Bands Open
The valence flat bands in transition metal dichalcogenide (TMD) heterobilayers are shown to exhibit strong intralayer spin-orbit coupling. This is reflected in a simple tight-binding model with spin-dependent complex hoppings based on the …
View article: Observation of flat bands in twisted bilayer graphene
Observation of flat bands in twisted bilayer graphene Open
Transport experiments in twisted bilayer graphene have revealed multiple superconducting domes separated by correlated insulating states1–5. These properties are generally associated with strongly correlated states in a flat mini-band of t…
View article: Slow Nonthermalizing Dynamics in a Quantum Spin Glass
Slow Nonthermalizing Dynamics in a Quantum Spin Glass Open
Spin glasses and many-body localization (MBL) are prime examples of ergodicity breaking, yet their physical origin is quite different: the former phase arises due to rugged classical energy landscape, while the latter is a quantum-interfer…
View article: An Experimental Proposal to Study Collapse of the Wave Function in Traveling‐Wave Parametric Amplifiers
An Experimental Proposal to Study Collapse of the Wave Function in Traveling‐Wave Parametric Amplifiers Open
The readout of a microwave qubit state occurs using an amplification chain that enlarges the quantum state to a signal detectable with a classical measurement apparatus. However, at what point in this process is the quantum state really “m…
View article: A Practical Introduction to Density Functional Theory
A Practical Introduction to Density Functional Theory Open
These lecture notes contain a brief practical introduction to doing density functional theory calculations for crystals using the open source Quantum Espresso software. The level is aimed at graduate students who are studying condensed mat…