Department of Physics

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Main Departmental Office
Physics Building, 110
P.O. Box 311427
Denton, TX 76203-1427
(940) 565-2626
Web site: www.phys.unt.edu

Floyd D. McDaniel, Chair

Graduate Faculty: Deering, Duggan, Fanelli, Golding, Grigolini, Holland, Hu, Kobe, Kowalski, Krokhin, Littler, Matteson, McDaniel, Mueller, Neogi, Ordonez, Perez, Quintanilla, Roberts, Shiner, Weathers.

Students in the Department of Physics have the opportunity to obtain training on state-of-the-art equipment in new and modern research laboratories in areas of interest to the scientific and industrial communities, particularly those involved in microelectronics, semiconductors, applications of accelerators, lasers and modern computational methods. Opportunities are available to develop highly marketable skills in modern basic and applied physics as well as close interactions with regional industries.

Research

The physics department is conducting research in solid state, semiconductor and polymer physics; atomic, molecular and applied nuclear physics, accelerator based materials physics and nuclear magnetic resonance; and theoretical physics in quantum, statistical and computational physics and non-linear dynamics, including applications to biomedical phenomena.

The condensed matter, molecular and atomic physics programs include studies of energy levels, lifetimes, scattering mechanisms, transition rates, dissipative responses and interaction of light with matter. Housed in the Physics Building and the Science Research Building, the laboratories associated with these programs contain continuous CO and CO2 and far infrared lasers. Low temperature and high magnetic field facilities and transmission electron microscopes also are located in these laboratories. Current semiconductor projects include magneto-optic interactions, two-photon spectroscopy and the study of artificially structured materials. Field emission of diamond and microemitters are being investigated.

In nuclear magnetic resonance, high-resolution multipulse methods are used to study interactions in solids. A prime interest in theoretical physics lies in applying quantum theory to many-particle systems. Mathematical problems involving Green’s functions, Feynman diagrams, canonical transformations and gauge theory are being investigated. These and other methods are being applied to solids, quantum fluids and nuclei. Plasma confinement schemes are also being investigated using computational techniques.

The Ion Beam Modification and Analysis Accelerator Laboratory contains four accelerators, including a 200 kV high-current Cockcroft Walton machine, two 2.5 MV single-ended van de Graaf and a 3 MV Tandem Electrostatic Pelletron-Type Accelerator. The program’s objectives are (1) fundamental studies of ion atom collisions, including ionization, excitation and charge transfer processes, and (2) the use of ion beams for materials characterization and modification of electronic and other materials. The most notable of these characterization techniques is the development of an accelerator-based Secondary Ion Mass Spectrometer (SIMS) that can detect impurities in materials at the parts-per-trillion level. This technique, called Trace Element Accelerator Mass Spectrometry (TEAMS), was developed in conjunction with the materials characterization group at Texas Instruments Inc. Other materials characterization techniques include nuclear reaction analysis, charged particle activation analysis, Rutherford backscattering spectrometry, ion channeling and particle-induced X-ray emission. These techniques can also be applied with a heavy-ion microprobe attached to the tandem accelerator. Modification of metal and semiconductor materials by ion implantation is also of interest.

Atomic and molecular spectroscopy investigations are being made to determine interaction parameters from line width and line profile data to better understand the collision phenomena and momentum transfer associated with gaseous mixtures. Experimental measurement and theoretical modeling of vibrationally excited molecular systems are being conducted with the goal of understanding molecular potentials. Precision spectroscopic measurements of atomic transition energies are being conducted to test the accuracy of QED theory.

The program in statistical physics has a variety of specializations, including both classical and quantum non-equilibrium statistical mechanics with an emphasis on stochastic differential equations. There also are investigations into deterministic randomness (chaos) and its relation to traditional stochastic processes. These techniques along with the numerical methods are applied to all areas of physics. In addition to the study of chaos, the techniques for non-linear dynamics are applied to the understanding of neural networks (research done in collaboration with members of the biological sciences department) and other complex physiological systems.

The Center for Nonlinear Science (CNS) is a research organization whose research focus is phenomena-driven rather than discipline-driven and, therefore, spans traditional disciplines such as physics, mathematics, biology and economics. The emphasis of CNS is on the development of new analytic and computational techniques to assist in the understanding of complex (nonlinear) phenomena that have not yielded their secrets to traditional methods of investigation.

Federal support of research projects in the department includes the National Science Foundation, the Office of Naval Research, the Air Force Office of Scientific Research, the Army Research Office, the Defense Advanced Research Projects Agency and the Army Night Vision Laboratory. Other research support has been granted by the Robert A. Welch Foundation, the Texas Advanced Technology Research Program, Texas Instruments Inc. and other industries.

Admission Requirements

The student must apply for and be granted admission through the office of the dean of the Toulouse School of Graduate Studies; admission requirements applicable to all departments may be found in the Admission section of this bulletin. A student who has not had the equivalent of an undergraduate major in physics at this institution may expect the time required for completion of degree requirements to be longer than average.

Departmental forms for applying for financial aid and information concerning evaluation of credit in physics may be obtained from the chair of the Department of Physics. All applicants seeking admission to a graduate degree program in physics are required to take a standardized admission test (e.g., GRE, GMAT, LSAT, etc.). For standardized admission test requirements, contact the department or the Toulouse School of Graduate Studies. In addition, applicants for financial aid must provide scores on the GRE advanced physics test. International applicants must also provide a minimum of 550 on the TOEFL (Test of English as a Foreign Language) exam. An entrance interview concerning fundamental physics is required of all students. The interview is used as an aid in placement. Further details may be obtained from the departmental office. The entrance interview is administered preceding the first day of registration in the fall and spring terms/semesters and the first summer session.

Degree Programs

The Department of Physics offers graduate programs leading to the following degrees:

Concentrations at the doctoral level are available in atomic physics, theoretical physics and solid state physics.

Master’s Degree Options

Master of Arts (with thesis) or Master of Science (with research problems in lieu of thesis, or a course work option).

Option 1, Master of Arts

The graduate credit requirement for the Master of Arts degree is 30 semester hours chosen in the following manner.

1. PHYS 5500, 5510, 5710 and 5720.

2. PHYS 5950 (6-hour thesis). The thesis must be submitted in the manuscript form prescribed by the American Institute of Physics.

3. 12 semester hours chosen from physics or related fields, with permission of academic adviser and major professor.

Option 2, Master of Science

The graduate credit requirement for the Master of Science degree is 33 semester hours chosen in the following manner.

1. PHYS 5500, 5510, 5710, 5720, 6000 and 3 additional hours chosen from the basic curriculum of the physics PhD program.

2. PHYS 5920 and 5930 (Problems in Lieu of Thesis). Research problems in lieu of thesis are independent though not necessarily original studies that may be experimental, computational, tutorial, bibliographic, pedagogic or a combination of these. As part of the requirements for each problems course, the student must present a formal written report of the work done in the course, which must be approved by the advisory committee and filed in the graduate dean’s office. Reports for PHYS 5920 and 5930 must be submitted in the manuscript form prescribed by the American Institute of Physics (see AIP Style Manual, current edition).

3. 9 hours chosen from physics or related fields. Physics courses must include 5450.

Option 3, Master of Science

The graduate credit requirement for the Master of Science degree is 36 semester hours chosen in the following manner.

1. PHYS 5500, 5510, 5710, 5720, 6000, 6001, 6030 and 6110.

2. PHYS 5450.

3. 9 additional hours, which may include 2 hours of PHYS 5940 and 6 hours of PHYS 5900.

Seminar in Current Literature or Colloquium

All physics graduate students must attend the department of physics’ colloquium each week during each long term/semester of full-time graduate study. Students may opt to earn credit for this requirement by enrolling in PHYS 5941.

Examinations

An entrance interview concerning fundamental physics is required of all students. The results are used for advisory, placement and remedial purposes.

An oral presentation of the master’s thesis (PHYS 5950) is required. The thesis is accepted by the student’s advisory committee after an oral examination is successfully completed. Problems in lieu of thesis (PHYS 5920 and 5930) must be accepted by the student’s advisory committee; oral presentation is optional.

Doctor of Philosophy

The Doctor of Philosophy degree represents the attainment of a high level of scholarship and achievement in independent research. To be granted a PhD with a major in physics, a graduate student admitted to the physics PhD program must achieve the following: (1) admission to candidacy for the PhD, and (2) approval for the granting of the PhD.

Admission to Candidacy for the PhD

Admission to candidacy for the PhD with a major in physics involves a two-part qualification process. In the first part, the student must demonstrate proficiency in the core areas of physics; in the second, the student must complete required advanced course work, and demonstrate preparedness for conducting independent research toward the dissertation.

1. Demonstration of proficiency in the core areas of physics:

The student must complete the following six core courses or their equivalents: PHYS 5500, 5510, 5710, 5720, 6030 and 6110. Students who take these courses at UNT and earn a grade of A in at least three of these courses and a grade of B in the rest, will automatically satisfy this part of the qualification process. A student who enrolls at UNT with a master’s degree in physics from another institution may meet this requirement by completing PHYS 5510, 5710, 6030 and 6110, and attaining a grade of A in at least two of the courses and a minimum grade of B in the remainder. Alternatively, any student may satisfy this part of the qualification process by earning a minimum grade of B in the six core courses or their equivalent and by passing a comprehensive examination over the core areas of physics, to be scheduled and administered by the departmental examination committee. The expectation is that a student should pass this part of the qualification process after no more than three years of full-time graduate study if entering the program with only a bachelor’s degree in physics, and after no more than one year of full-time study if entering the program with a master’s degree in physics.

2. Preparation of independent research:

There are several aspects to this part of the qualification process. First, the student must select a major professor and a doctoral advisory committee. A major professor provides close guidance and supervision of the student’s doctoral studies. The doctoral advisory committee is selected by the student in consultation with the major professor and must include the major professor. Second, the student must file a degree plan, which must be approved by the doctoral advisory committee and the graduate adviser. These two things should be done before or very shortly after satisfying the first part of the qualifying process. Third, the student must complete organized course work required by the degree plan and earn a minimum grade of B in each course. Fourth, after the student and major professor have decided upon a dissertation research project for the student, the student must present a proposal for the research to the doctoral advisory committee. This proposal must be in the form of both a written report and an oral presentation to the doctoral advisory committee. Prior to the oral presentation, the student must provide each member of his or her doctoral advisory committee with a copy of the report. The report and the oral presentation to the doctoral advisory committee must include both a description of the research already done and a proposal of research for completing the dissertation. The doctoral advisory committee will administer an oral examination at the end of the oral presentation over the proposal and related topics. The doctoral advisory committee must approve of the admission to candidacy for the PhD degree before the student applies for candidacy at the Toulouse School of Graduate Studies. Course work recommendations associated with specific concentrations are available. Please inquire with the graduate adviser. The following courses will be required for all students: PHYS 5450, 5700, 6000, 6155 and 6500.

Approval of Granting the PhD

Approval of granting the PhD degree in physics requires demonstration of professional research aptitude. Professional research aptitude must be demonstrated by conducting research and reporting the research in at least one peer-reviewed professional journal article of which the student is the first author, in a dissertation and in an oral presentation to the doctoral advisory committee referred to as the final defense. The appropriateness of the journal publication(s) must be evaluated by the committee. At least 30 days prior to the scheduled final defense, the student must provide each member of his or her doctoral advisory committee with a copy of his or her completed dissertation and a copy of the requisite journal article(s), which must be either already published or accepted for publication–in the latter case, copies of the letter(s) of acceptance for publication should be included. The doctoral advisory committee must approve the granting of the PhD degree before the student may submit the dissertation to the graduate dean for final approval.

Courses of Instruction

All Courses of Instruction are located in one section at the back of this catalog.

Course and Subject Guide

The “Course and Subject Guide,” found in the Courses of Instruction section of this book, serves as a table of contents and provides quick access to subject areas and prefixes.

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