Publications
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Many-body localization: stability and instability KU Leuven
Rare regions with weak disorder (Griffiths regions) have the potential to spoil localization. We describe a non-perturbative construction of local integrals of motion (LIOMs) for a weakly interacting spin chain in one dimension, under a physically reasonable assumption on the statistics of eigenvalues. We discuss ideas about the situation in higher dimensions, where one can no longer ensure that interactions involving the Griffiths regions are ...
Stability and instability towards delocalization in many-body localization systems KU Leuven
© 2017 American Physical Society. We propose a theory that describes quantitatively the (in)stability of fully many-body localization (MBL) systems due to ergodic, i.e., delocalized, grains, that can be, for example, due to disorder fluctuations. The theory is based on the ETH hypothesis and elementary notions of perturbation theory. The main idea is that we assume as much chaoticity as is consistent with conservation laws. The theory describes ...
Effect of tape on dynamic postural stability in subjects with chronic ankle instability Ghent University
Stability of Measurement Outcomes for Voluntary Task Performance in Participants With Ankle Instability and Healthy Controls KU Leuven
CONTEXT: Acceptable measurement stability during data collection is critically important to research. To interpret differences in measurement outcomes among participants or changes within participants after an intervention program, we need to know whether the measurement is stable and consistent. OBJECTIVE: To determine the within-session stability of muscle activation patterns for a voluntary postural-control task in a group of noninjured ...
Stability and instability in East Asia's major power relations University of Antwerp
Do patients with minor shoulder instability have a different outcome from those with recurrent anteroinferior instability? Vrije Universiteit Brussel
Purpose: Minor or anterosuperior shoulder instability (MSI) is a relatively new concept with other characteristics than recurrent anteroinferior instability (TUBS). MSI includes patients without history of dislocation, with non-specific clinical symptoms and signs but with indications of laxity of (SGHL)/MGHL with isolated injury of (SGHL)/MGHL seen during arthroscopy. TUBS patients typically present with recurrent anteroinferior instability ...
Crossover between snake instability and Josephson instability of dark solitons in superfluid Fermi gases University of Antwerp
Dark solitons in superfluid Bose gases decay through the snake instability mechanism, unless they are strongly confined. Recent experiments in superfluid Fermi gases have also interpreted soliton decay via this mechanism. However, we show using both an effective field numerical simulation and a perturbative analysis that there is a qualitative difference between soliton decay in the BEC and BCS regimes. On the BEC side of the interaction domain, ...
Valgus instability as a cause for recurrent lateral patellar dislocation: a new mechanism for patellofemoral instability? KU Leuven
An association between lateral patellar dislocation (LPD) and medial collateral ligament injury (MCL) has recently been demonstrated on MRI. The same valgus injury that disrupts the femoral MCL insertion can also cause a simultaneous MPFL tear at its femoral insertion, due to the close anatomical relationship of both ligamentous structures. Valgus laxity due to MCL-deficiency increases the Q-angle and further adversely affects patellar ...