Acoustic Polaron in Free-Standing Slabs

• 作者: Guangming Si Junhua Hou
• 来源期刊: 凝固态物理国际期刊(英文)
• 学科: 医学
• 关键词: FREE-STANDING SLABS ACOUSTIC POLARON SELF-TRAPPING
• 年，卷（期）: ngtwlgjqkyw_2014,（4）
• 页码范围: 235-240
• 页数: 6页
• 分类号: R73

摘要

The ground-state energy and its derivate of the acoustic polaron in free-standing slab are calculated by using the Huybrechts-like variational approach. The criteria for presence of the selftrapping transition of the acoustic polaron in free-standing slabs are determined qualitatively. The critical coupling constant for the discontinuous transition from a quasi-free state to a trapped state of the acoustic polaron in free-standing slabs tends to shift toward the weaker electronphonon coupling with the increasing cutoff wave-vector. Detailed numerical results confirm that the self-trapping transition of holes is expected to occur in the free-standing slabs of wide-bandgap semi-conductors.