PD Dr. Martin Hasenbusch

Profil

Zusammenfassung

Martin Hasenbusch entwickelt und optimiert Computersimulationsmethoden (Monte-Carlo-Verfahren) zur Untersuchung von Phasenübergängen in physikalischen Systemen. Seine Expertise liegt darin, kritische Phänomene in Gittermodellen präzise zu berechnen und dabei systematische Fehler zu minimieren — ein Wissen, das für die numerische Modellierung komplexer Materialverhalten in der Industrie relevant ist.

Skills

Name

PD Dr. Martin Hasenbusch

Titel

PD Dr.

Fakultät

Mathematisch-Naturwissenschaftliche Fakultät

Institut

Institut für Physik

Arbeitsgruppe

Theoretische Physik (Phänomenologie der Elementarteilchenphysik jenseits des Standardmodells)

E-Mail

🔒 nur für eingeloggte sichtbarAnmelden

Telefon

🔒 nur für eingeloggte sichtbarAnmelden

HU-FIS-Profil

Quelle ↗

Zuletzt gescrapt

28.6.2026, 01:06:23

• Algorithms for lattice QCD and related models

  Quelle ↗

  Förderer: DFG Eigene Stelle (Sachbeihilfe) Zeitraum: 10/2016 - 09/2018 Projektleitung: PD Dr. Martin Hasenbusch, Prof. Dr. rer. nat. Peter Uwer

• Kritische Casimirkraft zwischen Kugel und Ebenen: Monte-Carlo-Simulation von Spinmodellen

  Quelle ↗

  Förderer: DFG Eigene Stelle (Sachbeihilfe) Zeitraum: 10/2013 - 09/2015 Projektleitung: PD Dr. Martin Hasenbusch

• Kritischer Casimireffekt: Monte-Carlo-Simulationen verbesserter Modelle

  Quelle ↗

  Förderer: DFG Eigene Stelle (Sachbeihilfe) Zeitraum: 11/2008 - 10/2010 Projektleitung: PD Dr. Martin Hasenbusch

🔒 Das System hat 223 mögliche Industrie-Partner gefunden — Firmen, Scores und Begründungen sind nur für eingeloggte Nutzer:innen sichtbar. Anmelden

• Critical exponents and equation of state of the three-dimensional Heisenberg universality class

  2002

  Physical review. B, Condensed matter · 485 Zitationen · DOI

  We improve the theoretical estimates of the critical exponents for the three-dimensional Heisenberg universality class. We find $\ensuremath{\gamma}=1.3960(9),$ $\ensuremath{\nu}=0.7112(5),$ $\ensuremath{\eta}=0.0375(5),$ $\ensuremath{\alpha}=\ensuremath{-}0.1336(15),$ $\ensuremath{\beta}=0.3689(3),$ and $\ensuremath{\delta}=4.783(3).$ We consider an improved lattice ${\ensuremath{\varphi}}^{4}$ Hamiltonian with suppressed leading scaling corrections. Our results are obtained by combining Monte Carlo simulations based on finite-size scaling methods and high-temperature expansions. The critical exponents are computed from high-temperature expansions specialized to the ${\ensuremath{\varphi}}^{4}$ improved model. By the same technique we determine the coefficients of the small-magnetization expansion of the equation of state. This expansion is extended analytically by means of approximate parametric representations, obtaining the equation of state in the whole critical region. We also determine a number of universal amplitude ratios.

• Critical behavior of the three-dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>XY</mml:mi></mml:math>universality class

  2001

  Physical review. B, Condensed matter · 380 Zitationen · DOI

  We improve the theoretical estimates of the critical exponents for the three-dimensional $\mathrm{XY}$ universality class. We find $\ensuremath{\alpha}=\ensuremath{-}0.0146(8),$ $\ensuremath{\gamma}=1.3177(5),$ $\ensuremath{\nu}=0.67155(27),$ $\ensuremath{\eta}=0.0380(4),$ $\ensuremath{\beta}=0.3485(2),$ and $\ensuremath{\delta}=4.780(2).$ We observe a discrepancy with the most recent experimental estimate of $\ensuremath{\alpha};$ this discrepancy calls for further theoretical and experimental investigations. Our results are obtained by combining Monte Carlo simulations based on finite-size scaling methods, and high-temperature expansions. Two improved models (with suppressed leading scaling corrections) are selected by Monte Carlo computation. The critical exponents are computed from high-temperature expansions specialized to these improved models. By the same technique we determine the coefficients of the small-magnetization expansion of the equation of state. This expansion is extended analytically by means of approximate parametric representations, obtaining the equation of state in the whole critical region. We also determine the specific-heat amplitude ratio.

• Finite size scaling study of lattice models in the three-dimensional Ising universality class

  2010

  Physical Review B · 331 Zitationen · DOI

  We study the spin-1/2 Ising model and the Blume-Capel model at various values of the parameter $D$ on the simple cubic lattice. To this end we perform Monte Carlo simulations using a hybrid of the local Metropolis, the single cluster and the wall cluster algorithm. Using finite size scaling we determine the value ${D}^{\ensuremath{\ast}}=0.656(20)$ of the parameter $D$, where leading corrections to scaling vanish. We find $\ensuremath{\omega}=0.832(6)$ for the exponent of leading corrections to scaling. In order to compute accurate estimates of critical exponents, we construct improved observables that have a small amplitude of the leading correction for any model. Analyzing data obtained for $D=0.641$ and 0.655 on lattices of a linear size up to $L=360$ we obtain $\ensuremath{\nu}=0.63002(10)$ and $\ensuremath{\eta}=0.03627(10)$. We compare our results with those obtained from previous Monte Carlo simulations and high-temperature series expansions of lattice models, by using field-theoretic methods and experiments.

Aus HU-FIS sind keine Kooperationen für diese Person gemeldet.