Louk Rademaker

Charge Smoothening and Band Flattening due to Hartree corrections in Twisted Bilayer Graphene

Louk Rademaker, Dmitry A. Abanin, Paula Mellado

Doping twisted bilayer graphene away from charge neutrality leads to an enormous buildup of charge inhomogeneities within each MoirÃ© unit cell. Here we show, using unbiased real-s…

cond-mat.str-el2012

The dynamical frustration of interlayer excitons delocalizing in bilayer quantum antiferromagnets

Louk Rademaker, Kai Wu, Hans Hilgenkamp +1

Using the self-consistent Born approximation we study the delocalization of interlayer excitons in the bilayer Heisenberg quantum antiferromagnet. Under realistic conditions we fin…

Enhancement of spin propagation due to interlayer exciton condensation

Louk Rademaker, Jeroen van den Brink, Hans Hilgenkamp +1

We show that an interlayer exciton condensate doped into a strongly correlated Mott insulator exhibits a remarkable enhancement of the bandwidth of the magnetic excitations (triplo…

cond-mat.dis-nn2021

Scaling Theory of Few-Particle Delocalization

Louk Rademaker

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 a…

cond-mat.str-el2015

The Tower of States and the Entanglement Spectrum in a Coplanar Antiferromagnet

Louk Rademaker

We extend the analytical arguments of Metlitski and Grover (arXiv:1112.5166) to compute the entanglement spectrum and entanglement entropy of coplanar antiferromagnets with $S O (3)$ …

cond-mat.mtrl-sci2014

How bilayer excitons can greatly enhance thermoelectric efficiency

Kai Wu, Louk Rademaker, Jan Zaanen

Currently, one of the major nanotechnological challenges is to design thermoelectric devices that have a high figure of merit. To that end, we propose to use bilayer excitons. Bila…

cond-mat.str-el2015

Glassy dynamics in geometrically frustrated Coulomb liquids without disorder

Samiyeh Mahmoudian, Louk Rademaker, Arnaud Ralko +2

We show that introducing long-range Coulomb interactions immediately lifts the massive ground state degeneracy induced by geometric frustration for electrons on quarter-filled tria…

Exciton condensation in strongly correlated electron bilayers

Louk Rademaker, Jeroen van den Brink, Jan Zaanen +1

We studied the possibility of exciton condensation in Mott insulating bilayers. In these strongly correlated systems an exciton is the bound state of a double occupied and empty si…

cond-mat.str-el2026

Electronic Sound and Diffusion in Disordered Multiband Metals

Miguel-Ãngel SÃ¡nchez-MartÃnez, Blaise GoutÃ©raux, Louk Rademaker +1

Multiband metals can host acoustic plasmons: gapless collective charge excitations involving out-of-phase motion of electrons in different bands, sometimes referred to as 'demons'.…

cond-mat.str-el2018

Charge-transfer insulation in twisted bilayer graphene

Louk Rademaker, Paula Mellado

We studied the real space structure of states in twisted bilayer graphene at the `magic angle' $I^¸ = 1.0 8^{\circ}$ . The flat bands close to charge neutrality are composed of a mix of…

cond-mat.str-el2010

Prediction of the quantization of magnetic flux in double layer exciton superfluids

Louk Rademaker, Jan Zaanen, Hans Hilgenkamp

Currently a way is lacking to detect unambiguously the possible phase coherence of an exciton condensate in an electron-hole double layer. Here we show that despite the fact that e…

Angular momentum of vortex-core Majorana zero modes

Giulia Venditti, Christophe Berthod, Louk Rademaker

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 mom…

cond-mat.supr-con2017

Phonon linewidth due to electron-phonon interactions with strong forward scattering in FeSe thin films on oxide substrates

Yan Wang, Louk Rademaker, Elbio Dagotto +1

The discovery of an enhanced superconducting transition temperature $T_{c}$ in monolayers of FeSe grown on several oxide substrates has opened a new route to high- $T_{c}$ superconducti…

cond-mat.mes-hall2023

Universal scaling near band-tuned metal-insulator phase transitions

Simone Fratini, Sergio Ciuchi, Vladimir Dobrosavljevic +1

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 $TÏ>1…

cond-mat.str-el2023

Doping a Wigner-Mott insulator: Exotic charge orders in transition-metal dichalcogenide moirÃ© heterobilayers

Yuting Tan, Pak Ki Henry Tsang, Vladimir DobrosavljeviÄ +1

The moirÃ© pattern induced by lattice mismatch in transition-metal dichalcogenide heterobilayers causes the formation of flat bands, where interactions dominate the kinetic energy.…

cond-mat.str-el2016

Many-body localization and delocalization from the perspective of Integrals of Motion

Louk Rademaker, Miguel Ortuno, Andres M. Somoza

We study many-body localization (MBL) and delocalization from the perspective of integrals of motion (IOMs). MBL can be understood phenomenologically through the existence of macro…

Dynamics of a single exciton in strongly correlated bilayers

Louk Rademaker, Kai Wu, Jan Zaanen

We formulated an effective theory for a single interlayer exciton in a bilayer quantum antiferromagnet, in the limit that the holon and doublon are strongly bound onto one interlay…

cond-mat.supr-con2024

Topological superconductivity with mixed singlet-triplet pairing in moirÃ© transition-metal-dichalcogenide bilayers

Waseem Akbar, Andrzej Biborski, Louk Rademaker +1

We investigate strong coupling topological superconductivity in twisted moirÃ© bilayer WSe $_{2}$ . Our approach is based on an effective $t$ - $J$ model with displacement-field-dependen…

quant-ph2024

The Instability of a Quantum Superposition of Time Dilations

Louk Rademaker, Tom van der Reep, Nick Van den Broeck +3

Using the relativistic concept of time dilation we show that a superposition of gravitational potentials can lead to nonunitary time evolution. For sufficiently weak gravitational…

cond-mat.mtrl-sci2024

Moire magnetism in CrBr3 multilayers emerging from differential strain

Fengrui Yao, Dario Rossi, Ivo A. Gabrovski +8

Interfaces between twisted 2D materials host a wealth of physical phenomena originating from the long-scale periodicity associated with the resulting moire structure. Besides twist…

cond-mat.stat-mech2018

Suppressed Density of States in Self-Generated Coulomb Glasses

Louk Rademaker, Zohar Nussinov, Leon Balents +1

We investigate the structure of metastable states in self-generated Coulomb glasses. In dramatic contrast to disordered electron glasses, we find that these states lack marginal st…

cond-mat.str-el2024

Pressure-tuned many-body phases through $I^$ -K valleytronics in moirÃ© bilayer WSe $_{2}$

Marta BrzeziÅska, Sergii Grytsiuk, Malte RÃ¶sner +2

Recent experiments in twisted bilayer transition-metal dichalcogenides have revealed a variety of strongly correlated phenomena. To theoretically explore their origin, we combine h…

cond-mat.dis-nn2021

Slow Nonthermalizing Dynamics in a Quantum Spin Glass

Louk Rademaker, Dmitry A. Abanin

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 classic…

cond-mat.mes-hall2022

Determining spin-orbit coupling in graphene by quasiparticle interference imaging

Lihuan Sun, Louk Rademaker, Diego Mauro +7

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…

cond-mat.stat-mech2013

Influence of long-range interactions on charge ordering phenomena on a square lattice

Louk Rademaker, Yohanes Pramudya, Jan Zaanen +1

Usually complex charge ordering phenomena arise due to competing interactions. We have studied how such ordered patterns emerge from the frustration of a long-ranged interaction on…

Quenching the Kitaev honeycomb model

Louk Rademaker

I studied the non-equilibrium response of an initial NÃ©el state under time evolution with the Kitaev honeycomb model. With isotropic interactions ( $J_{x} = J_{y} = J_{z}$ ) the system qu…

cond-mat.mes-hall2015

Impurity Bound States and Greens Function Zeroes as Local Signatures of Topology

Robert-Jan Slager, Louk Rademaker, Jan Zaanen +1

We show that the local in-gap Greens function of a band insulator $G_{0} (I^µ, k_{∥}, r_{⊥} = 0)$ , with $r_{⊥}$ the position perpendicula…

cond-mat.str-el2025

Universal relation between residual resistivity and A coefficient in correlated metals

Anna Yu. Efimova, Yohei Saito, Atsushi Kawamoto +3

The effects of strong electronic correlations and disorder are crucial for emergent phenomena such as unconventional superconductivity, metal-insulator transitions, and quantum cri…

physics.hist-ph2025

Something about the Mechanism of Induction Phenomena: The forgotten work of Berta de Haas-Lorentz on diamagnetism in superconductors

Giulia Venditti, Carlo Beenakker, Louk Rademaker

In 1925, Dr. Geertruida Luberta "Berta" de Haas-Lorentz published the paper "Iets over het mechanisme van inductieverschijnselen" in the journal Physica. Her paper was the first to…

cond-mat.str-el2022

Observation of flat $I^$ moirÃ© bands in twisted bilayer WSe $_{2}$

Gianmarco Gatti, Julia Issing, Louk Rademaker +16

The recent observation of correlated phases in transition metal dichalcogenide moirÃ© systems at integer and fractional filling promises new insight into metal-insulator transition…

cond-mat.mes-hall2020

Hofstadter subband ferromagnetism and symmetry broken Chern insulators in twisted bilayer graphene

Yu Saito, Jingyuan Ge, Louk Rademaker +4

In bilayer graphene rotationally faulted to theta=1.1 degrees, interlayer tunneling and rotational misalignment conspire to create a pair of low energy flat band that have been fou…

cond-mat.str-el2016

Avoiding Stripe Order: Emergence of the Supercooled Electron Liquid

Louk Rademaker, Arnaud Ralko, Simone Fratini +1

In the absence of disorder, electrons can display glassy behavior through supercooling the liquid state, avoiding the solidification into a charge ordered state. Such supercooled e…

cond-mat.str-el2020

Topological Flat Bands and Correlated States in Twisted Monolayer-Bilayer Graphene

Louk Rademaker, Ivan Protopopov, Dmitry Abanin

Monolayer graphene placed with a twist on top of AB-stacked bilayer graphene hosts topological flat bands in a wide range of twist angles. The dispersion of these bands and gaps be…

Drosophila of phonon-mediated superconductivity: Full Eliashberg theory of the jellium model

Christophe Berthod, Louk Rademaker, Dirk van der Marel

We present a full numerical solution of the Migdal--Eliashberg equations for the jellium model of phonon-mediated superconductivity. We find very low critical temperatures below 1~…

cond-mat.mes-hall2021

Spin-Orbit Coupling in Transition Metal Dichalcogenide Heterobilayer Flat Bands

Louk Rademaker

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-bindi…

cond-mat.str-el2016

Universality and critical behavior of the dynamical Mott transition in a system with long-range interactions

Louk Rademaker, Valerii V. Vinokur, Alexey Galda

We study numerically the voltage-induced breakdown of a Mott insulating phase in a system of charged classical particles with long-range interactions. At half-filling on a square l…

cond-mat.str-el2015

Explicit Local Integrals of Motion for the Many-Body Localized State

Louk Rademaker, Miguel OrtuÃ±o

Recently, it has been suggested that the Many-Body Localized phase can be characterized by local integrals of motion. Here we introduce a Hilbert space preserving renormalization s…

cond-mat.str-el2023

Kagome chiral spin liquid in transition metal dichalcogenide moirÃ© bilayers

Johannes Motruk, Dario Rossi, Dmitry A. Abanin +1

At $n = 3/4$ filling of the moirÃ© flat band, transition metal dichalcogenide moirÃ© bilayers will develop kagome charge order. We derive an effective spin model for the resulting lo…

cond-mat.mes-hall2021

Gate-tunable imbalanced Kane-Mele model in encapsulated bilayer jacutingaite

Louk Rademaker, Marco Gibertini

We study free, capped and encapsulated bilayer jacutingaite Pt $_{2}$ HgSe $_{3}$ from first principles. While the free standing bilayer is a large gap trivial insulator, we find that the…

Stability and Absence of a Tower of States in Ferrimagnets

Louk Rademaker, Aron Beekman, Jasper van Wezel

Antiferromagnets and ferromagnets are archetypes of the two distinct (type-A and type-B) ways of spontaneously breaking a continuous symmetry. Although type-B Nambu--Goldstone mode…

cond-mat.mtrl-sci2020

A Practical Introduction to Density Functional Theory

Louk Rademaker

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 i…

quant-ph2019

Construction of Many-Body Eigenstates with Displacement Transformations

Miguel OrtuÃ±o, Andres M. Somoza, Louk Rademaker

Many-body eigenstates beyond the gaussian approximation can be constructed in terms of local integrals of motion (IOM), although their actual computation has been until now a daunt…

hep-th2019

An Introduction to Spontaneous Symmetry Breaking

Aron J. Beekman, Louk Rademaker, Jasper van Wezel

Perhaps the most important aspect of symmetry in physics is the idea that a state does not need to have the same symmetries as the theory that describes it. This phenomenon is know…

cond-mat.supr-con2025

Optimal superconductivity in twisted bilayer WSe $_{2}$ where the Van Hove singularity crosses half-filling

MichaÅ Zegrodnik, Waseem Akbar, Andrzej Biborski +1

The recent discovery of unconventional superconductivity has pointed to twisted WSe $_{2}$ bilayer as a versatile platform for studying the correlated and topological phases of matter…

cond-mat.mes-hall2026

Tuning correlated states of twisted mono-bilayer graphene with proximity-induced spin-orbit coupling

Jeyong Park, Mingdi Luo, Louk Rademaker +3

We study the correlated ground states of twisted mono-bilayer graphene with and without proximity-induced spin-orbit coupling (SOC) from a transition-metal dichalcogenide layer pla…

Louk Rademaker

We show that the exact ground state of the Lieb-Mattis Hamiltonian is an equal-weight superposition of all possible classical NÃ©el states, and provide an exact formulation of this…

cond-mat.quant-gas2017

Quantum Thermalization and the Expansion of Atomic Clouds

Louk Rademaker, Jan Zaanen

The ultimate consequence of quantum many-body physics is that even the air we breathe is governed by strictly unitary time evolution. The reason that we perceive it nonetheless as…

Realistic Pearl vortices in thin film superconductors

We analyze magnetic field profiles of vortices in thin-film superconductors, shedding new light on this old and presumed settled problem. In sufficiently thin films with realistic…

cond-mat.str-el2022

How to recognize the universal aspects of Mott criticality?

Yuting Tan, Vladimir Dobrosavljevic, Louk Rademaker

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) t…

cond-mat.str-el2024

Concealed Mott Criticality: Unifying the Kondo Breakdown and Doped Charge-Transfer Insulators

Louk Rademaker

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 p…

cond-mat.str-el2024

Hall response of locally correlated two-dimensional electrons at low density

Giacomo Morpurgo, Louk Rademaker, Christophe Berthod +1

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 carrie…

Determinant quantum Monte Carlo study of exciton condensation in the bilayer Hubbard model

Louk Rademaker, Steve Johnston, Jan Zaanen +1

We studied the possibility of exciton condensation in a strongly correlated bilayer extended Hubbard model using Determinant Quantum Monte Carlo. To model both the onsite repulsion…