### Abstract

We present a conditionally integrable potential, belonging to the bi-confluent Heun class, for which the Schrödinger equation is solved in terms of the confluent hypergeometric functions. The potential involves an attractive inverse square root term ~x^{-1/2} with arbitrary strength and a repulsive centrifugal barrier core ~x^{-2} with the strength fixed to a constant. This is a potential well defined on the half-axis. Each of the fundamental solutions composing the general solution of the Schrödinger equation is written as an irreducible linear combination, with non-constant coefficients, of two confluent hypergeometric functions. We present the explicit solution in terms of the non-integer order Hermite functions of scaled and shifted argument and discuss the bound states supported by the potential. We derive the exact equation for the energy spectrum and approximate that by a highly accurate transcendental equation involving trigonometric functions. Finally, we construct an accurate approximation for the bound-state energy levels.

Original language | English |
---|---|

Pages (from-to) | 407-414 |

Number of pages | 8 |

Journal | Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences |

Volume | 73 |

Issue number | 5 |

DOIs | |

Publication status | Published - 24 May 2018 |

### Fingerprint

### Keywords

- 02.30.Gp special functions
- 02.30.Ik Integrable systems
- 03.65.Ge Solutions of wave equations: bound states

### ASJC Scopus subject areas

- Mathematical Physics
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry

### Cite this

*Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences*,

*73*(5), 407-414. https://doi.org/10.1515/zna-2017-0314

**A Conditionally Integrable Bi-confluent Heun Potential Involving Inverse Square Root and Centrifugal Barrier Terms.** / Ishkhanyan, Tigran A.; Krainov, Vladimir P.; Ishkhanyan, Artur M.

Research output: Contribution to journal › Article

*Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences*, vol. 73, no. 5, pp. 407-414. https://doi.org/10.1515/zna-2017-0314

}

TY - JOUR

T1 - A Conditionally Integrable Bi-confluent Heun Potential Involving Inverse Square Root and Centrifugal Barrier Terms

AU - Ishkhanyan, Tigran A.

AU - Krainov, Vladimir P.

AU - Ishkhanyan, Artur M.

PY - 2018/5/24

Y1 - 2018/5/24

N2 - We present a conditionally integrable potential, belonging to the bi-confluent Heun class, for which the Schrödinger equation is solved in terms of the confluent hypergeometric functions. The potential involves an attractive inverse square root term ~x-1/2 with arbitrary strength and a repulsive centrifugal barrier core ~x-2 with the strength fixed to a constant. This is a potential well defined on the half-axis. Each of the fundamental solutions composing the general solution of the Schrödinger equation is written as an irreducible linear combination, with non-constant coefficients, of two confluent hypergeometric functions. We present the explicit solution in terms of the non-integer order Hermite functions of scaled and shifted argument and discuss the bound states supported by the potential. We derive the exact equation for the energy spectrum and approximate that by a highly accurate transcendental equation involving trigonometric functions. Finally, we construct an accurate approximation for the bound-state energy levels.

AB - We present a conditionally integrable potential, belonging to the bi-confluent Heun class, for which the Schrödinger equation is solved in terms of the confluent hypergeometric functions. The potential involves an attractive inverse square root term ~x-1/2 with arbitrary strength and a repulsive centrifugal barrier core ~x-2 with the strength fixed to a constant. This is a potential well defined on the half-axis. Each of the fundamental solutions composing the general solution of the Schrödinger equation is written as an irreducible linear combination, with non-constant coefficients, of two confluent hypergeometric functions. We present the explicit solution in terms of the non-integer order Hermite functions of scaled and shifted argument and discuss the bound states supported by the potential. We derive the exact equation for the energy spectrum and approximate that by a highly accurate transcendental equation involving trigonometric functions. Finally, we construct an accurate approximation for the bound-state energy levels.

KW - 02.30.Gp special functions

KW - 02.30.Ik Integrable systems

KW - 03.65.Ge Solutions of wave equations: bound states

UR - http://www.scopus.com/inward/record.url?scp=85043286167&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85043286167&partnerID=8YFLogxK

U2 - 10.1515/zna-2017-0314

DO - 10.1515/zna-2017-0314

M3 - Article

VL - 73

SP - 407

EP - 414

JO - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences

JF - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences

SN - 0932-0784

IS - 5

ER -