Variation of Chemical Potential Oscillations of a 2DEG in a Quantum Well Under a Magnetic Field for Multiple Sub-Band Occupation as Function of Temperature and Level-Broadening

Berrin ÖZDEMİR; Zeki YARAR; Metin ÖZDEMİR

Makale detayları

Variation of Chemical Potential Oscillations of a 2DEG in a Quantum Well Under a Magnetic Field for Multiple Sub-Band Occupation as Function of Temperature and Level-Broadening

Yazarlar:

Berrin ÖZDEMİR | Zeki YARAR | Metin ÖZDEMİR

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2004 Vol.28 Issue 1, pp.1-16

Belge Tipi:

Makale

Yayın Tarihi:

12/2003

Belge Dili:

Türkçe

Document ID (Org No.):

2000761778

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Anahtar kelimeler:

Özet:

 

We study the variation of chemical potential in a two  dimensional electron gas in a uniform magnetic field as a function of  temperature and level-broadening parameter.  Schrödinger and Poisson  equations are solved self-consistently for a two dimensional electron  gas formed in a GaxAl1-xAs/GaAs quantum well, to numerically  determine the potential profile, empty or occupied energy sub-bands,  the wavefunctions and electron concentrations corresponding to each  sub-band at various temperatures.  Then assuming that the electron  concentration is not altered, the variation of chemical potential with  respect to both temperature and energy level-broadening parameter is  studied under a uniform and constant magnetic field.  Gaussian,  exponential and lorentzian forms of broadening are assumed and the  results are compared.  Increasing temperature or level-broadening have  been found to have qualitatively the same effect on chemical potential  oscillations, although the underlying processes are different.  It is  found that, as the number of occupied sub-bands increases, the shape  of oscillations increases in complexity.  The results can be directly  tested by experimental studies.

 

We study the variation of chemical potential in a two  dimensional electron gas in a uniform magnetic field as a function of  temperature and level-broadening parameter.  Schrödinger and Poisson  equations are solved self-consistently for a two dimensional electron  gas formed in a GaxAl1-xAs/GaAs quantum well, to numerically  determine the potential profile, empty or occupied energy sub-bands,  the wavefunctions and electron concentrations corresponding to each  sub-band at various temperatures.  Then assuming that the electron  concentration is not altered, the variation of chemical potential with  respect to both temperature and energy level-broadening parameter is  studied under a uniform and constant magnetic field.  Gaussian,  exponential and lorentzian forms of broadening are assumed and the  results are compared.  Increasing temperature or level-broadening have  been found to have qualitatively the same effect on chemical potential  oscillations, although the underlying processes are different.  It is  found that, as the number of occupied sub-bands increases, the shape  of oscillations increases in complexity.  The results can be directly  tested by experimental studies.

Makale detayları

Variation of Chemical Potential Oscillations of a 2DEG in a Quantum Well Under a Magnetic Field for Multiple Sub-Band Occupation as Function of Temperature and Level-Broadening

Yazarlar:

Berrin ÖZDEMİR | Zeki YARAR | Metin ÖZDEMİR

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2004 Vol.28 Issue 1, pp.1-16

Belge Tipi:

Makale

Yayın Tarihi:

12/2003

Belge Dili:

Türkçe

Document ID (Org No.):

2000761778

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Chemical potential

level-broadening

quantum well

Poisson-Schrödinger solution

Sayı

Makale detayları

Variation of Chemical Potential Oscillations of a 2DEG in a Quantum Well Under a Magnetic Field for Multiple Sub-Band Occupation as Function of Temperature and Level-Broadening

Yazarlar: Berrin ÖZDEMİR | Zeki YARAR | Metin ÖZDEMİR

Yayıncı: TUBITAK

Dergi: Turkish Journal of Physics 2004 Vol.28 Issue 1, pp.1-16

Belge Tipi: Makale

Yayın Tarihi: 12/2003

Belge Dili: Türkçe

Document ID (Org No.): 2000761778

Sıklık: İki Aylık

eISSN: 1303-6122

pISSN: 1300-0101

Chemical potential

level-broadening

quantum well

Poisson-Schrödinger solution

Sayı

Yazarlar:

Berrin ÖZDEMİR | Zeki YARAR | Metin ÖZDEMİR

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2004 Vol.28 Issue 1, pp.1-16

Belge Tipi:

Makale

Yayın Tarihi:

12/2003

Belge Dili:

Türkçe

Document ID (Org No.):

2000761778

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101