Dr. Afif SIDDIKİ

İletişim bilgileri:

E-mail: siddiki@mu.edu.tr, siddiki@theorie.physik.uni-muenchen.de

Adres: Muğla Üniversitesi Fen-Edebiyat Fakültesi
Fizik Bölümü 4800, Kötekli/Muğla

Araştırma alanları:

İki boyutlu yük sistemlerinde doğrusal olmayan elektronik perdeleme ve yük taşınımı Cift
tabaka sistemlerinin Thomas-Fermi-Poisson perdeleme teorisi, Kuantum noktalarda etkileşim,
Kuantize Hall etkisinin (KHE) kırılma, Spin-yoğunluk fonksiyonal teorisi, KHE tabanlı girişim
deneylerinin açıklanması çok parçacıklı sistemlerin paralel kodlarının geliştirilmesi.

Öğrenim:

Doktora: Julius-Maximilians-Universit at, Wurzburg, Almanya
(Araştırma yeri Max-Planck-Institut fÄur FestkÄorperforschung, Stuttgart, Almanya)
Fizik, Haziran 2005
Tez Konusu: "Model calculations of current and density distributions in dissipative Hall
bars"
Tez Danışmanı : Prof. Rolf R. Gerhardts

Yüksek Lisans: Bilkent Üniversitesi, Ankara, Türkiye, Fizik, Eylül 1999
Tez Konusuı: "Low Temperature Thermodynamics of Finite and Discrete Quartic Quan-
tum Oscillator in One Dimension "
Tez Danışmanı: Doç. Dr. Tuğrul Hakioğlu

Lisans: İstanbul Teknik Ä Üniversitesi, _İstanbul, Türkiye , Fizik Mühendisliği, Ağustos 1997
Bitirme tezi: "Canonical Transformation of Hubbard Hamiltonian to t-J Model"
Danışman: Prof. Enver P. Nahkmedov

• Alman araştırma cemiyetinden (Deutsche Forschungsgemeinschaft) araştırma bursu, 2001-
  2005
• Bilkent Üniversitesinden araştırma bursu, 1999-2000
• Bilkent Üniversitesinden öğrenim bursu, 1997-1999
  

Akademik deneyim:

Doktora sonrası çalışma:

• Physics department, LS von Delft, LMU, Munih, Almanya. (Ocak
  2006 - )
• MPI fur FestkÄorperforschung, Stuttgart, Almanya. (Temmuz 2005-
  Aralık 2005)

Okutman:

• "Applications of coherent transport to two-dimensional electron gas", Condensed
  matter physics Autumn workshop 2006, International center for theoretical and applied physics,
  Muğla, Türkiye. (11-16 Eylül 2006)
• "Self-consistent models at coherent transport", Condensed matter physics Autumn
  workshop 2006, Feza GÄursey Institute, _Istanbul, TÄurkiye. (4-10 EylÄul 2006)
• "Screening theory of quantum dots and Hall bars ", Condensed matter physics
  spring workshop 2006, International center for theoretical and applied physics, Muğla, Türkiye.
  (24-31 Mart 2006)
• "Introduction to quantum Hall e®ect", Condensed matter physics workshop 2005,
  Muğla Üniversitesi, Muğla, Türkiye. (8-13 Ağustos 2005)
• (Together with Prof. R. R. Gerhardts), "Transport in Low-Dimensional Systems",
  Fizik bölümü, Bilkent Üniversitesi, Ankara, Türkiye. (21 Mart 2005- 15 Nisan 2005)
  

Araştırma Görevlisi:

• Fizik bölümü, Ortadoğu Teknik Üniversitesi, Ankara, Türkiye. (Mart
  2000-Ağustos 2001)
  PHYS 101-102 Fundamentals of Physics
  PHYS 111-112 General Physics Lab.
  PHYS 431-432 Quantum Mechanics I-II
• Fizik Bölümü Bilkent Üniversitesi, Ankara, Türkiye. (EyÄul 1997-S»ubat
  2000)

Yayınlar:

Uluslararası Hakemli dergiler:

1. A. Sıddıki and R. R. Gerhardts. "Thomas-Fermi-Poisson theory of screening for laterally confined and unconfined two-dimensional electron systems in strong magnetic fields". Phys. Rev. B, 68, 125315 (2003)

2. A. Sıddıki and R. R. Gerhardts. "The interrelation between Incompressible strips and Quantized Hall Plateaus". International Journal of Modern Physics B 18, 3541 (2004)

3. A. Sıddıki and R. R. Gerhardts. "Incompressible strips in dissipative Hall bars as origin of quantized Hall Plateaus". Phys.Rev. B, 70, 195335 (2004)

4. A. Sıddıki, S. Kraus and R. R. Gerhardts. "Screening model of magneto-transport hysteresis observed in bilayer quantum Hall systems". Physica E 34, 136. (2006)

5. A. Siddiki and F. Marquardt. "Self-consistent calculation of the electron distribution near a Quantum-Point Contact in the integer Quantum Hall Effect". Phys. Rev. B, 75, 045325 (2007)

6. A. Siddiki "Self-consistent Coulomb picture of an electron-electron bilayer system". Phys.Rev. B, 75, 155311 (2007)

7. A. Sıddıki and R. R. Gerhardts. "Range-Dependent Disorder Effects On The Plateau-Widths Calculated Within The Screening Theory Of The IQHE". International Journal of Modern Physics B 21, 1362 (2007)

8. D. Eksi, E. Çiçek, and A. I. Mese, S. Aktas, A. Siddiki and T. Hakioglu"Theoretical inves-tigation of the effect of sample properties on the electron velocity in quantum Hall bars".Phys. Rev. B, 76, 075334 (2007)

9. K. Guven, A. Siddiki, P. M. Krishna and T. Hakioglu. "A microscopic Coulomb interaction model as a origin of Drag effect phenomenon". Physica E, 40, 1169-1171 (2008)

10. A. Siddiki, E. Cicek, D. Eksi, A. I. Mese, S. Aktas and T. Hakioglu. "Where are the edge-states near the quantum point contacts ? A self-consistent approach". Physica E, 40, 1160-1162 (2008)

11. A. Siddiki, D. Eksi, E. Çiçek, A. I. Mese, S. Aktas and T. Hakioglu. "Theoretical investi-gation of the electron velocity in quantum Hall bars, in the out of linear response regime". Physica E, 40, 1217-1219 (2008)

12. A. Siddiki. "The spin-split incompressible edge states within: empirical, Hartree and density functional theory (DFT) approximations at intermediately large Hall samples". Physica E, 40, 1124-1126 (2008)

13. P. M. Krishna, A. Siddiki, K. Guven and T. Hakioglu. "Local current distribution at large quantum dots (QDs): a self-consistent screening model". Physica E, 40, 1142-1144 (2008)

14. A. Siddiki, A. E. Kavruk, T. Ozturk, U. Atav and T. Hakioglu. "The self-consistent calculation of the edge states at quantum Hall effect (QHE) based Mach-Zehnder interferometers (MZI)". Physica E, 40, 1398-1400 (2008)

15. J. Horas, A. Siddiki, J. Moser, W.Wegscheider and S. Ludwig. "Investigations on unconventional aspects in the QH regime of narrow gate defined channels". Physica E, 40, 1130-1132 (2008)

16. S. Arslan, E. Çiçek, D. Eksi, S. Aktas, A. Weichselbaum, and A. Siddiki " Modeling of quantum point contacts in high magnetic fields and with current bias outside the linear response regime"Phys. Rev. B, 78, 125423 (2008)

Uluslararası Konferanslarda sunulan bildiriler:

1. A. Sıddıki and R. R. Gerhardts. "Nonlinear Thomas-Fermi-Poisson theory of screening for a Hall bar under strong magnetic fields". Proceedings of the 15th International conference on High magnetic fields in Semiconductor physics, Oxford, England, August 2002. (edited by: A. R. Long and J. H. Davies), ISBN:0-7503-0924-5, Institute of Physics Publishing, Bristol (UK).

Hazırlık aşamasında olan yayınlar:

1. A. K. Huettel, A. Siddiki, K. Eberl, and S. Ludwig. "Gate voltage controlled rectication in a quantum dot at high magnetic fields".

2. J. Horas, A. Siddiki, J. Mosel, S. Ludwig and W. Wegscheider. "Sample width and mobility dependent activation energy in narrow Hall bars".

3. S. Arslan, A.Weichselbaum, E. Cicek, S. Aktas and A. Siddiki. "Ohmic current °ow through QPCs in the IQHE regime".

4. N. Ofek, A. Siddiki, M. Heiblum and V. Umansky. "Theoretical and experimental manifestation of edge and bulk IQHE at a single plateau".

5. D. Eksi, S. Kanamaru , S. Aktas, A. Siddiki and H. Akera. "Local and interaction based model of the breakdown of quantum Hall effect".

6. D. Eksi, S. Aktas, K. Guven and A. Siddiki. "Self-consistent theory of visibility oscillations observed at Mach-Zehnder interference experiments, using non-Gaussian noise".

7. S. Arslan, A. Weichselbaum, E. Cicek, S. Aktas and A. Siddiki. "Realistic modelling of quantum dots used as Aharonov-Bohm interferometers in the IQHE regime".

8. K. Guven, P. M. Krishna and A. Siddiki "Coulomb interaction as origin of Coulomb interaction: A local model".

9. L. Steinke, A. Siddiki and M. Grayson. "Formation of the incompressible strips at the junctions of bent-QHE samples".

10. A. Siddiki and S. Aktas. "Spin resolved transport at quantized Hall samples with constrictions".

11. E. Cicek, T. Otsuko, A. Siddiki and S. Aktas. "Symmetry induced current °ow in double quantum dots".

Davetli konuşmalar:

1. Thomas-Fermi-Poisson theory of screening for different Hall bar geometries under strong magnetic fields. Bilkent University, Physics Department, General Seminars. Ankara, Türkiye. Mart 2003.

2. Incompressible strips as origin of quantized Hall plateaus. Bilkent University, Physics Department, General Seminars. Ankara, Türkiye. Kasım 2003.

3. Quantized Hall plateaus resulting from incompressible strips. Walter-Schottky Institut, Experimental Semiconductor Physics I, General Seminars. Munich, Almanya. Nısan 2004.

4. The role of screening for the formation of quantized Hall plateaus. Izmir High-technology Institute, General seminars. Izmir, TÄurkiye. Haziran 2004.

5. Screening theory of IQHE without localization. Physikalisch-Technische Bundesanstalt (PTB), Abt. Elektrizitaet, Group Seminars. Braunschweig, Almanya. Şubat 2005.

6. Non-linear screening in dissipative Hall bars. Sabancı University, Physics Department, General Seminars. İstanbul, Türkiye. Mart 2005.

7. Screening theory of IQHE without localization. Middle East Technical University, Physics Department, General Seminars. Ankara, Türkiye. Nisan 2005.

8. The in°uence of long-range potential °uctuations on the formation of incompressible strips and quantized Hall plateaus. Izmir High-technology Institute, General seminars. İzmir, Türkiye. Ağustos 2005.

9. The in°uence of long-range potential °uctuations on the formation of incompressible strips and quantized Hall plateaus. Mersin University, General seminars. Mersin, Türkiye. Eylül 2005.

10. The role of electron interactions on theory of IQHE without localization. Ludwig-Maximillians-University, Physics Department, LS Kothauss, General Seminars. Munich, Almanya. Ocak 2006.

11. The Edge-Bulk theory of IQHE. Mugla Universitesi, General seminars. Muğla, Türkiye. Mart 2006.

12. The Edge-Bulk theory of IQHE. Akdeniz Universitesi, General seminars. Antalya, Türkiye. Nisan 2006.

13. From Edge state picture of IQHE to Mach-Zehnder interferometer via QPC. Monte Verita, Strongly correlated low dimensional systems. Ascona, Switzerland. Temmuz 2006.

14. From Edge state picture of IQHE to Mach-Zehnder interferometer via QPC. University of Regensburg, Group seminars. Regensburg, Germany. November 2006.

15. The interaction theory of IQHE. Regensburg German physical society (DPG) meeting Regensburg, Almanya. Mart 2007.

16. The interaction theory of IQHE. Ben Gurion University German Israeli Project (DIP) meeting . Beer Sheva, Israil. Mayıs 2007.

17. The unconventional aspects of the QHE von Klitzing's group meeting.Max-Planck society, Ringberg castle, Munih, Almanya. EylÄul 2007.

18. Ohmic transport through 1D quantum constructions in the IQHE regime "Time dependent phenomena in quantum mechanics".H. Fabri institute, Blaubeuren, Almanya. Eylül 2007.

19. Ohmic transport through 1D quantum constructions in the IQHE regime DPG meeting.Berlin Teknik üniversitesi, Berlin, Almanya. Şubat 2007.

20. "The unconventional aspects of the QHE". Hannover University, Physics Department.Hannover, Almanya. Mart 2008.

21. "The unconventional aspects of the QHE". Oldenburg University, Physics Department.Oldenburg, Almanya. Nisan 2008.

22. "The unconventional aspects of the QHE". Paul Drude Institute, Semiconductor Physics Department. Berlin, Almanya. Mayıs 2008.

23. "The unconventional aspects of the QHE". C» ek ulusal akademisi, Semiconductor Physics Department.Prag, C» ek cumhuriyeti. Mayis 2008.

24. "The unconventional aspects of the QHE". İstanbul Teknik Üniversitesi, NanoTr4 Konferansı. Istanbul, Türkiye. Mayis 2008.

25. Current direction induced rectification effect:Theory and Experiments. Max-Planck-Institut fÄur FestkÄorperforschung, Abt. von Klitzing, General seminars, Stuttgart, Ağustos 2008.

Konuşmalar:

1. Canonical Transformation of Hubbard Hamiltonian to t-J Model (Tez sunumu). İstanbul Teknik Üniversitesi fifizik bölümü, İstanbul, Ağustos 1997.

2. Discrete and Finite Bosonic States. Istanbul Teknik Üniversitesi, fizik bölümü, İstanbul, Ocak 1999.

3. Low Temperature Thermodynamics of Finite and Discrete Quartic Quantum Oscillator in One Dimension (Master tezi sunumu). Bilkent University, Physics Department, Ankara, Eylül 1999.

4. Possibility of Bose Condensation in One-dimension. Middle East Technical University,Physics Department, General Seminars, Ankara, Mayıs 2000.

5. Nonlinear Thomas-Fermi-Poisson theory of screening for a Hall bar under strong magnetic fields. Max-Planck-Institut fÄur FestkÄorperforschung, Abt. von Klitzing, Group Seminars, Stuttgart, Nisan 2002.

6. Self-Consistent screening theory at different Hall bar geometries under strong magnetic fields. Max-Planck-Institut fÄur FestkÄorperforschung, Abt. von Klitzing, Group Seminars, SÄud-Tirol, Ekim 2002.

7. Incompressible strips as origin of quantized Hall plateaus. Max-Planck-Institut fur Festkorperforschung, Abt. von Klitzing, Group Seminars, Ringberg Castle, Munich, Ekim 2003.

8. Screening in electron-electron bilayer systems. Max-Planck-Institut fÄur Festkorperforschung, Abt. von Klitzing, General seminars, Stuttgart, Şubat 2004.

9. Quantized Hall plateaus resulting from incompressible strips. Max-Planck-Institut fur FestkÄorperforschung, Abt. von Klitzing, Group Seminar, Stuttgart, Nisan 2004.

10. Screening theory of IQHE without localization: Theory and Predicitions. Max-Planck- Institut fÄur FestkÄorperforschung, Abt. von Klitzing, Group Seminars, Freudenstadt, Ekim 2004.

11. Screening properties of electron-electron bilayer systems: Measurement and Calculation. Max-Planck-Institut fur FestkÄorperforschung, Abt. von Klitzing, Group seminars, Freudenstadt, Ekim 2004.

12. Model calculations of current and density distributions in dissipative Hall bars (Doktora tezi sunumu). Julius-Maximilians-UniversitÄat , Department of physics and astronomy, Wurzburg, Haziran 2005.

Poster Sunumları:

1. Nonlinear Thomas-Fermi-Poisson theory of screening for a Hall bar under strong magneticfields. SemiMag-15, Institute of Physics, Oxford, İngiltere, Ağustos 2002.

2. Thomas-Fermi-Poisson theory of nonlinear screening in a 2DEG under strong magnetic fields. QHE: Past, Present and Future, Abt. von Klitzing, MPI-FKF, Stuttgart, Almanya,Temmuz 2003.

3. The interrelation between Incompressible strips and Quantized Hall plateaus. SemiMag-16,National High Magnetic Field Laboratory, Tallahassee, Florida, A.B.D, Ağustos 2004.

4. The in°uence of long-range °uctuations on the formation of incompressible strips and quantized Hall plateaus. EPQHS, CalTech. of Pasadena , Taos, New Mexico, A.B.D, Temmuz 2005.

5. Screening based model of observed hysteresis in bilayer systems. EP2DS-16, Sandia National Laboratories, Albuquerque, New Mexico, A.B.D, Temmuz 2005.

6. Electron distribution near a QPC in the QHE regime. Quantum information processing,SFB meeting Hersching, Munih, Almanya Mayıs 2006.

7. Electron and current density distribution near a QPC. Strongly correlated low dimensional systems, Monte Verita, Ascona, Isvicre Temmuz 2006.

Yaz/kış okulları:

1. Summerschool, Quantum Field Theory, Temmuz 1996, Bilkent üniversity, Ankara, Türkiye. 12th Winterschool, New Developments in Solid State Physics, Low-dimensional Systems, Şubat 2002, Mauterndorf, Austurya.

2. Summerschool, Theoretical and Computational Materials Science, Haziran, 2003, Max-Planck-Institute, Stuttgart, Almanya.13th Winterschool, New Developments in Solid State Physics, Low-dimensional Systems,Şubat 2004, Mauterndorf, Austurya.

Akademik becerileri:

Programlama dilleri: FORTRAN 77, FORTRAN 90, FORTRAN 95, basic programming in C

Uygulamalar: Parallel computation using MPI, high performance parallel computing, OPENMP, Maple, Mathematica, LATEX, common Windows database, spreadsheet, and presentation

software

işletim sistemleri: Unix/Linux, Windows.

Temiz oda deneyimi: Dr. S. Lok danışmanlığında, MPI-Stuttgart

Cryogenic laboratuar deneyimi: Oxford Instruments sivi Helyum sıcaklı~gında yÄuk ta»sınımı.

Üyelikler:

• German Physical Society (DPG).

• Associate member of Center for Nano science (CeNS), Munich/Germany.

• Member of Arnold Sommerfeld center for theoretical physics (ASC), Munich/Germany.

• Member of Institute of theoretical and applied physics (ITAP) Marmaris/Turkey.

Yürütülen Tez Çalışmaları:

1. (2007) J. Horas, M.Sc., Ludwigs-Maximillians University Munich, Physics Dept. LS Kotthaus

2. (Dr. Stefan Ludwig ile birlikte). Title: "Investigations on unconventional aspects in the QH regime of narrow gate defined channels".

3. (2007) D. Eksi, M.Sc., Trakya University Physics dept. ( Yard. Doc. S. Aktas ile birlikte).Title: "Theoretical investigation of the electron velocity in quantum Hall bars".

4. (2008) S. Arslan, M.Sc., Technical University of Munich, Dept. of scientific computation. Title: "Realistic modelling of quantum point contact under strong magnetic fields".

5. E. Cicek, Ph.D., Trakya University Physics dept. (Doc. Dr. M. Aktas ile birlikte). Title: "Self-consistent calculation of the electron distribution at 2DES in the integer quantum Hall effect regime", Devam ediyor