General area: Condensed Matter Theory and Statistical Physics

Selection of notable publications:

* PRL2009: My shortest-title-ever paper: Feshbach-Einstein condensates. Using a new numerical quantum Monte Carlo algorithm we study condensed phases of mixtures of ultracold atoms and molecules created via Feshbach-resonance interaction. We find a new quantum phase: the super-Mott phase, which has characteristics of both superfluids and (Mott) insulators (It was later established the phase is not an actual superfluid, so the name should be considered somewhat misleading: we call it the `special-Mott phase' now). We also find opportunity to dissociate the name Bose from atomic and molecular condensates (appropriate since Bose never envisioned this possibility); published in Phys. Rev. Lett. 102, 015301 (2009); also available as e-print cond-mat/0810.3763; authors: Valéry Rousseau and PJHD (Univ. Leiden, NL).

* PRL2005: on the visibility of absorption images as obtained from ultracold bosonic atoms in their superfluid and Mott-insulating phases; the observed, but unexplained, kinks in experiment are also found in our numerical simulations and are now better understood; published in Phys. Rev. Lett. 95, 220402 (2005); also available as e-print cond-mat/0509560; authors: Pinaki Sengupta (UC Riverside, USA), Marcos Rigol (UC Davis, USA), George Batrouni (INLN, Nice, France), PJHD (Univ. Leiden, NL), and Richard Scalettar (UC Davis, USA).

* PRL2004: on what happens if a cold, dilute Bose gas is confined to one spatial dimension (e.g. by using lasers) and the repulsive interaction between bosons gets very large; the bosons become almost like fermions, but not quite! This new state of quantum matter is called a Tonks-Girardeau gas; published in Phys. Rev. Lett. 93, 210401 (2004); also available as e-print cond-mat/0408596; authors: Lode Pollet, Stefan Rombouts (Univ. Gent, Belgium) and PJHD (Univ. Leiden, NL).

* PRL2003: on the effect of a Zeeman magnetic field (coupling just to spin, not orbit of electrons) on a two-dimensional disordered electronic system; published in Phys. Rev. Lett. 90, 246401 (2003); also available as e-print cond-mat/0302576; co-author: Richard Scalettar (UC Davis, USA).

* PRL2002: on the 1D Bose-Hubbard model in a harmonic trap, relevant to Bose condensates of ultracold atoms captured in optical lattices of criss-crossing laser beams; published in Phys. Rev. Lett. 89, 117203 (2002); also available as e-print cond-mat/0203082; authors: George Batrouni, Valéry Rousseau (INLN, Nice, France), Richard Scalettar (UC Davis, USA), Marcos Rigol, Alejandro Muramatsu (Univ. Stuttgart, Germany), PJHD (Univ. Leiden, NL) and Matthias Troyer (ETH Zürich, Switzerland). This paper was cited more than 100 times in the five years after it's publication (and more than 200 times in the ten years after publication).

* PRL2001: on the role of symmetry in the effect of disorder on the Mott-Hubbard insulator; published in Phys. Rev. Lett. 87, 146401 (2001); also available as e-print cond-mat/0106204; co-authors: Richard Scalettar (UC Davis, USA) and Nandini Trivedi (Tata Institute, Mumbai, India).

* PRL1999: on the possibility of a metal to insulator transition in a two-dimensional interacting disordered electronic system; published in Phys. Rev. Lett. 83, 4610-4613 (1999); also available as e-print cond-mat/9907246; co-authors: Richard Scalettar (UC Davis, USA) and Nandini Trivedi (Tata Institute, Mumbai, India).

* Full list of my publications and writings (text).

* Top-10 of my most-cited publications (text).

* Top-10 of my most-frequent co-authors (text).

* Promo for prospective master thesis students (text and picture).

Voorjaar 2011:

In het academisch jaar 2010-2011 wordt het college Econofysica (gericht op derdejaars bachelor studenten natuurkunde en sterrenkunde) verzorgd door dr. Diego Garlaschelli in de maanden mei en juni 2011; het college wordt in het Engels gegeven; het eerste college is op maandag 2 mei 2011, 11:15-15:30u (lunchpauze 13-13:45u) in zaal HL106 (Huygens Lab.). Verder op de andere maandagen in mei en de eerste twee dinsdagen in juni. Het college wordt gegeven aan de hand van het boek:

Econophysics: An Introduction by S. Sinha, A. Chatterjee, A. Chakraborti, B.K. Chakrabarti (Publisher: Wiley-VCH, 2010; ISBN: 978-3-527-40815-3)

Dr. Garlaschelli zal in maart 2011 zijn werkzaamheden in Leiden aanvangen. Nadere informatie en details worden gegeven via het Blackboard systeem.

Voorjaar 2010:

Het college Econofysica (gericht op derdejaars bachelor studenten natuurkunde en sterrenkunde) wordt gehouden op 8 maandagen in januari, februari en maart 2010.

Het college wordt gegeven door 4 verschillende docenten:

• Dr. Peter Denteneer (Instituut-Lorentz, Univ. Leiden): ma 11 jan., 1 feb. 2010
• Dr.ir. Fedor van Mullem (Rabo): ma 18 en 25 jan. 2010
• Dr. Vincenzo Vitelli (Instituut-Lorentz, Univ. Leiden): ma 8 en 15 feb. 2010
• Prof.dr. Marcel Ausloos (Univ. Luik, België): ma 22 feb., 1 maart 2010

In de regel wordt van 11:15-13u college gegeven en van 13:45-14:30u een opgaven/discussie sessie gehouden. Nadere informatie en details worden gegeven via het Blackboard systeem.

* Materiaal College 7; 22 februari 2010; Prof. Marcel Ausloos

Presentatie College 7: Stock Exchange Crashes          Exercise Crash Forecast          Exercise Detrended Fluctuation Analysis

* Materiaal College 8; 1 maart 2010; Prof. Marcel Ausloos

Presentatie College 8: Towards a Hamiltonian approach to macroeconomy          Exercise Macroeconomic Hamiltonian

Najaar 2009:

Introductie colleges Econophysics in oktober/november 2009 door Dr.ir. Fedor van Mullem (Rabobank), Dr. Peter Denteneer (Instituut-Lorentz, Universiteit Leiden) en Prof.dr. Harry van Zanten (TU Eindhoven, EURANDOM).

*** Collegemateriaal: *** College I (Dr.ir. Fedor van Mullem, 15 oktober 2009): Financiële markten en instrumenten. College II (Dr. Peter Denteneer, 22 oktober 2009): Het standaard model van de financiële wiskunde: het Merton-Black-Scholes model voor de prijs van een optie. College III (Prof.dr. Harry van Zanten, 5 november 2009): Voorbij het Black-Scholes-Merton model.

* College Quantummechanica 2 (voorjaar 2012): alle informatie wordt gegeven via het Blackboard systeem.

September 2011: cursus 2012 nog niet beschikbaar op Blackboard. De inhoud van het college zal enigszins afwijken van voorgaande jaren: in het bijzonder, er zal begonnen worden met Hoofdstuk 5 van Griffiths en daarvan zullen ook secties 5.3 en 5.4, over quantum statistiek, behandeld worden.

* Colleges verzorgd in eerdere jaren:

• cursus 2001/2002: Quantum Theorie 1 (najaar), Statistische Fysica 2 (voorjaar)
• cursus 2002/2003 t/m cursus 2006/2007: Statistische en Thermische Fysica 1 (voorjaar)
• cursus 2007/2008 t/m cursus 2011/2012: Quantummechanica 2 (voorjaar, info via Blackboard)

* Course Quantum Theory (Fall 2012): Text books and course description

(August 30, 2012) First, and other, problem session (on Sept. 11) will be in HL106 (13:45-15:30h)

(August 3, 2012) First problem session QT: Tuesday Sept. 11, 2012, in xxx (13:45-15:30h)

(August 3, 2012) First lecture QT: Tuesday Sept. 4, 2012, in HL204 (11.15-13h)

(August 3, 2012) The course Quantum Theory in Fall 2012 will resemble that of Fall 2011 (see below and/or Blackboard),
but will differ in details. In particular, the text book is again Quantum Physics by M. Le Bellac.
More information will follow, via Blackboard.

********************************************************************************

*** Problem Sessions Quantum Theory *** (Tuesday, 13:45-15:30h, HL204)

• Teaching assistants:

  MSc. Dmitry Pikulin (pikulin@lorentz.leidenuniv.nl, office: Oort 268)

  MSc. Nitin Upadhyaya (nitin@lorentz.leidenuniv.nl, office: Oort 272)

• Dates and topics/chapters:

  Problem session 1: Tuesday Sep. 11, 2012; Chapter 2 and 3.

  Problem session 2: Tuesday Sep. 25, 2012; Chapter 3 and 4.

  Problem session 3: Tuesday Oct.   9, 2012; Chapter 6.

  Problem session 4: Tuesday Oct. 23, 2012; Chapter 6, 8 , 9 and 11.

  Problem session 5: Tuesday Nov.   6, 2012; Chapter 11 and "Second quantization": bosons.

  Problem session 6: Tuesday Nov. 20, 2012; "Second quantization": bosons and fermions.

  Problem session 7: Tuesday Dec.   4, 2012; Path Integrals and more "Second quantization": fermions.

* Lecture courses in previous years: 2006/2007 to 2011/2012: Quantum Theory (e.g. 2008/2009)

• Teletekst
• Volkskrant
• Cond-mat
• Painting by Jacob van Ruisdael; Dutch painter (1628-1682) after whom my previous computer was named (March 2004: sold to a Dutch private collector for 5 million euro; the painting, not my computer).
• Some pictures: Junior1, Travels with Fred (1985-1992), At Xmas-lunch (IL,17/12/04), Pisa (2005), Orvieto (2005), Trevi (2005), At Xmas-lunch (IL,16/12/05), Xmas-lunch 2006 (IL,15/12/06), Gullfoss (Iceland) (2006), Strokkur geiser (Iceland) (2006), Bitti (Sardegna) (2007), Nuraghe Loelle (Sardegna) (2007), Grotto del Bue Marino (Sardegna) (2007), Oliena (Sardegna) (2007), Xmas-lunch 2007 (IL,18/12/07), Valencia by night (2008), Baroque Valencia (2008), Jardines de Turia (Valencia) (2008), Ciutat de les Arts i de les Ciències, Calatrava (Valencia) (2008), Cadaqués (Costa Brava) (2008), Cap de Creus (Costa Brava) (2008), Re-PhD committee (Zijlstroom, 28/11/09), Tourstart 2010 (Rotterdam, 3/7/10), Foz do Iguacu (Brasil) (2010), Pantanal (Brasil) (2010), Pantanal - piranha (Brasil) (2010), Rio de Janeiro (Brasil) (2010), Rio - Catedral (Brasil) (2010), Rio - Plataforma (Brasil) (2010), Castilla - La Mancha (Espana) (2011), Dubrovnik (Croatia) (2011), Mostar (Bosnia) (2011), Rijeka (Croatia) (2011), Plitvice jezera (Croatia) (2011), Noordwijk (nov. 2011), Xmas-lunch 2011 (IL,16/12/11). Sterrewacht koepels (Leiden,04/02/12), Sterrewacht Witte Singel (Leiden,04/02/12), Sterrewacht Witte Singel+ (Leiden,11/02/12), Hooglandsekerk (Leiden,11/02/12), De Burcht (Leiden,11/02/12), Valencia (Espana) (2012), Zaragoza (Espana) (2012), Salamanca (Espana) (2012), Costa da Caparica (Portugal) (2012), Cordoba (Espana) (2012), Sterrewacht Huygens principe (Leiden,08/12/12), Sterrewacht in reflectie (Leiden,08/12/12),